/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the
- * License may not be used to create, or enable the creation or
- * redistribution of, unlawful or unlicensed copies of an Apple operating
- * system, or to circumvent, violate, or enable the circumvention or
- * violation of, any terms of an Apple operating system software license
- * agreement.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
*/
-/*
+/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
- *
+ *
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
- *
+ *
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
+ *
* Carnegie Mellon requests users of this software to return to
- *
+ *
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
- *
+ *
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
+/*
+ * NOTICE: This file was modified by McAfee Research in 2004 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ * Copyright (c) 2005 SPARTA, Inc.
+ */
/*
*/
/*
* Operations on kernel messages.
*/
-#include <norma_vm.h>
#include <mach/mach_types.h>
#include <mach/boolean.h>
#include <kern/kern_types.h>
#include <kern/assert.h>
+#include <kern/debug.h>
#include <kern/ipc_kobject.h>
#include <kern/kalloc.h>
#include <kern/zalloc.h>
#include <kern/processor.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
-#include <kern/spl.h>
#include <kern/misc_protos.h>
#include <kern/counters.h>
#include <kern/cpu_data.h>
+#include <kern/policy_internal.h>
+
+#include <pthread/priority_private.h>
+
+#include <machine/limits.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <ipc/ipc_right.h>
#include <ipc/ipc_hash.h>
#include <ipc/ipc_table.h>
+#include <ipc/ipc_importance.h>
+#if MACH_FLIPC
+#include <kern/mach_node.h>
+#include <ipc/flipc.h>
+#endif
+
+#include <os/overflow.h>
+
+#include <security/mac_mach_internal.h>
+
+#include <device/device_server.h>
#include <string.h>
#include <ppc/low_trace.h>
#endif
+#if DEBUG
+#define DEBUG_MSGS_K64 1
+#endif
-extern vm_map_t ipc_kernel_copy_map;
-extern vm_size_t ipc_kmsg_max_vm_space;
-extern vm_size_t msg_ool_size_small;
+#include <sys/kdebug.h>
+#include <libkern/OSAtomic.h>
-#define MSG_OOL_SIZE_SMALL msg_ool_size_small
+#pragma pack(4)
-#if defined(__LP64__)
-#define MAP_SIZE_DIFFERS(map) (map->max_offset < MACH_VM_MAX_ADDRESS)
-#define OTHER_OOL_DESCRIPTOR mach_msg_ool_descriptor32_t
-#define OTHER_OOL_PORTS_DESCRIPTOR mach_msg_ool_ports_descriptor32_t
-#else
-#define MAP_SIZE_DIFFERS(map) (map->max_offset > VM_MAX_ADDRESS)
-#define OTHER_OOL_DESCRIPTOR mach_msg_ool_descriptor64_t
-#define OTHER_OOL_PORTS_DESCRIPTOR mach_msg_ool_ports_descriptor64_t
-#endif
+typedef struct{
+ mach_msg_bits_t msgh_bits;
+ mach_msg_size_t msgh_size;
+ mach_port_name_t msgh_remote_port;
+ mach_port_name_t msgh_local_port;
+ mach_port_name_t msgh_voucher_port;
+ mach_msg_id_t msgh_id;
+} mach_msg_legacy_header_t;
-#define DESC_SIZE_ADJUSTMENT (sizeof(OTHER_OOL_DESCRIPTOR) - \
- sizeof(mach_msg_ool_descriptor_t))
+typedef struct{
+ mach_msg_legacy_header_t header;
+ mach_msg_body_t body;
+} mach_msg_legacy_base_t;
-/* scatter list macros */
+typedef struct{
+ mach_port_name_t name;
+ mach_msg_size_t pad1;
+ uint32_t pad2 : 16;
+ mach_msg_type_name_t disposition : 8;
+ mach_msg_descriptor_type_t type : 8;
+} mach_msg_legacy_port_descriptor_t;
-#define SKIP_PORT_DESCRIPTORS(s, c) \
-MACRO_BEGIN \
- if ((s) != MACH_MSG_DESCRIPTOR_NULL) { \
- while ((c) > 0) { \
- if ((s)->type.type != MACH_MSG_PORT_DESCRIPTOR) \
- break; \
- (s)++; (c)--; \
- } \
- if (c == 0) \
- (s) = MACH_MSG_DESCRIPTOR_NULL; \
- } \
-MACRO_END
-#define INCREMENT_SCATTER(s, c, d) \
-MACRO_BEGIN \
- if ((s) != MACH_MSG_DESCRIPTOR_NULL) { \
- s = (d) ? (mach_msg_descriptor_t *) \
- ((OTHER_OOL_DESCRIPTOR *)(s) + 1) : \
- (s + 1); \
- (c)--; \
- } \
-MACRO_END
+typedef union{
+ mach_msg_legacy_port_descriptor_t port;
+ mach_msg_ool_descriptor32_t out_of_line32;
+ mach_msg_ool_ports_descriptor32_t ool_ports32;
+ mach_msg_guarded_port_descriptor32_t guarded_port32;
+ mach_msg_type_descriptor_t type;
+} mach_msg_legacy_descriptor_t;
-/* zone for cached ipc_kmsg_t structures */
-zone_t ipc_kmsg_zone;
+#pragma pack()
-/*
- * Forward declarations
- */
+#define LEGACY_HEADER_SIZE_DELTA ((mach_msg_size_t)(sizeof(mach_msg_header_t) - sizeof(mach_msg_legacy_header_t)))
-void ipc_kmsg_clean(
- ipc_kmsg_t kmsg);
+// END LP64 fixes
-void ipc_kmsg_clean_body(
- ipc_kmsg_t kmsg,
- mach_msg_type_number_t number,
- mach_msg_descriptor_t *desc);
-void ipc_kmsg_clean_partial(
- ipc_kmsg_t kmsg,
- mach_msg_type_number_t number,
- mach_msg_descriptor_t *desc,
- vm_offset_t paddr,
- vm_size_t length);
+#if DEBUG_MSGS_K64
+extern void ipc_pset_print64(
+ ipc_pset_t pset);
-mach_msg_return_t ipc_kmsg_copyin_body(
- ipc_kmsg_t kmsg,
- ipc_space_t space,
- vm_map_t map);
+extern void ipc_kmsg_print64(
+ ipc_kmsg_t kmsg,
+ const char *str);
-/*
- * We keep a per-processor cache of kernel message buffers.
- * The cache saves the overhead/locking of using kalloc/kfree.
- * The per-processor cache seems to miss less than a per-thread cache,
- * and it also uses less memory. Access to the cache doesn't
- * require locking.
- */
+extern void ipc_msg_print64(
+ mach_msg_header_t *msgh);
+
+extern ipc_port_t ipc_name_to_data64(
+ task_t task,
+ mach_port_name_t name);
/*
- * Routine: ipc_kmsg_alloc
- * Purpose:
- * Allocate a kernel message structure. If we can get one from
- * the cache, that is best. Otherwise, allocate a new one.
- * Conditions:
- * Nothing locked.
+ * Forward declarations
*/
-ipc_kmsg_t
-ipc_kmsg_alloc(
- mach_msg_size_t msg_and_trailer_size)
-{
- mach_msg_size_t max_expanded_size;
- ipc_kmsg_t kmsg;
+void ipc_msg_print_untyped64(
+ mach_msg_body_t *body);
-#if !defined(__LP64__)
- /*
- * LP64support -
- * Pad the allocation in case we need to expand the
- * message descrptors for user spaces with pointers larger than
- * the kernel's own. We don't know how many descriptors
- * there are yet, so just assume the whole body could be
- * descriptors (if there could be any at all).
- *
- * The expansion space is left in front of the header,
- * because it is easier to pull the header and descriptors
- * forward as we process them than it is to push all the
- * data backwards.
- */
+const char * ipc_type_name64(
+ int type_name,
+ boolean_t received);
- mach_msg_size_t size = msg_and_trailer_size - MAX_TRAILER_SIZE;
- if (size > sizeof(mach_msg_base_t)) {
- mach_msg_size_t max_desc = ((size - sizeof(mach_msg_base_t)) /
- sizeof(mach_msg_ool_descriptor_t)) *
- DESC_SIZE_ADJUSTMENT;
- if (msg_and_trailer_size >= MACH_MSG_SIZE_MAX - max_desc)
- return IKM_NULL;
- max_expanded_size = msg_and_trailer_size + max_desc;
- } else
-#endif
- max_expanded_size = msg_and_trailer_size;
+void ipc_print_type_name64(
+ int type_name);
- if (max_expanded_size > ikm_less_overhead(MACH_MSG_SIZE_MAX))
- return IKM_NULL;
- else if (max_expanded_size < IKM_SAVED_MSG_SIZE)
- max_expanded_size = IKM_SAVED_MSG_SIZE; /* round up for ikm_cache */
+const char *
+msgh_bit_decode64(
+ mach_msg_bits_t bit);
- if (max_expanded_size == IKM_SAVED_MSG_SIZE) {
- struct ikm_cache *cache;
- unsigned int i;
-
- disable_preemption();
- cache = &PROCESSOR_DATA(current_processor(), ikm_cache);
- if ((i = cache->avail) > 0) {
- assert(i <= IKM_STASH);
- kmsg = cache->entries[--i];
- cache->avail = i;
- ikm_check_init(kmsg, max_expanded_size);
- enable_preemption();
- kmsg->ikm_header = (mach_msg_header_t *)
- ((vm_offset_t)(kmsg + 1) +
- max_expanded_size -
- msg_and_trailer_size);
- return (kmsg);
- }
- enable_preemption();
- kmsg = (ipc_kmsg_t)zalloc(ipc_kmsg_zone);
- } else {
- kmsg = (ipc_kmsg_t)kalloc(ikm_plus_overhead(max_expanded_size));
- }
+const char *
+mm_copy_options_string64(
+ mach_msg_copy_options_t option);
- if (kmsg != IKM_NULL) {
- ikm_init(kmsg, max_expanded_size);
- kmsg->ikm_header = (mach_msg_header_t *)
- ((vm_offset_t)(kmsg + 1) +
- max_expanded_size -
- msg_and_trailer_size);
+void db_print_msg_uid64(mach_msg_header_t *);
+
+static void
+ipc_msg_body_print64(void *body, int size)
+{
+ uint32_t *word = (uint32_t *) body;
+ uint32_t *end = (uint32_t *)(((uintptr_t) body) + size
+ - sizeof(mach_msg_header_t));
+ int i;
+
+ kprintf(" body(%p-%p):\n %p: ", body, end, word);
+ for (;;) {
+ for (i = 0; i < 8; i++, word++) {
+ if (word >= end) {
+ kprintf("\n");
+ return;
+ }
+ kprintf("%08x ", *word);
+ }
+ kprintf("\n %p: ", word);
}
- return(kmsg);
}
-/*
- * Routine: ipc_kmsg_free
- * Purpose:
- * Free a kernel message buffer. If the kms is preallocated
- * to a port, just "put it back (marked unused)." We have to
- * do this with the port locked. The port may have its hold
- * on our message released. In that case, we have to just
- * revert the message to a traditional one and free it normally.
- * Conditions:
- * Nothing locked.
- */
-void
-ipc_kmsg_free(
- ipc_kmsg_t kmsg)
+const char *
+ipc_type_name64(
+ int type_name,
+ boolean_t received)
{
- mach_msg_size_t size = kmsg->ikm_size;
- ipc_port_t port;
+ switch (type_name) {
+ case MACH_MSG_TYPE_PORT_NAME:
+ return "port_name";
- /*
- * Check to see if the message is bound to the port. If so,
- * mark it not in use. If the port isn't already dead, then
- * leave the message associated with it. Otherwise, free it.
- */
- port = ikm_prealloc_inuse_port(kmsg);
- if (port != IP_NULL) {
- ip_lock(port);
- ikm_prealloc_clear_inuse(kmsg, port);
- if (ip_active(port) && (port->ip_premsg == kmsg)) {
- assert(IP_PREALLOC(port));
- ip_unlock(port);
- return;
+ case MACH_MSG_TYPE_MOVE_RECEIVE:
+ if (received) {
+ return "port_receive";
+ } else {
+ return "move_receive";
}
- ip_check_unlock(port); /* May be last reference */
- }
- /*
- * Peek and see if it has to go back in the cache.
- */
- if (kmsg->ikm_size == IKM_SAVED_MSG_SIZE) {
- struct ikm_cache *cache;
- unsigned int i;
-
- disable_preemption();
- cache = &PROCESSOR_DATA(current_processor(), ikm_cache);
- if ((i = cache->avail) < IKM_STASH) {
- cache->entries[i] = kmsg;
- cache->avail = i + 1;
- enable_preemption();
- return;
+ case MACH_MSG_TYPE_MOVE_SEND:
+ if (received) {
+ return "port_send";
+ } else {
+ return "move_send";
+ }
+
+ case MACH_MSG_TYPE_MOVE_SEND_ONCE:
+ if (received) {
+ return "port_send_once";
+ } else {
+ return "move_send_once";
}
- enable_preemption();
- zfree(ipc_kmsg_zone, kmsg);
- return;
- }
- kfree(kmsg, ikm_plus_overhead(size));
-}
+ case MACH_MSG_TYPE_COPY_SEND:
+ return "copy_send";
-/*
- * Routine: ipc_kmsg_enqueue
- * Purpose:
- * Enqueue a kmsg.
- */
+ case MACH_MSG_TYPE_MAKE_SEND:
+ return "make_send";
+
+ case MACH_MSG_TYPE_MAKE_SEND_ONCE:
+ return "make_send_once";
+
+ default:
+ return (char *) 0;
+ }
+}
void
-ipc_kmsg_enqueue(
- ipc_kmsg_queue_t queue,
- ipc_kmsg_t kmsg)
+ipc_print_type_name64(
+ int type_name)
{
- ipc_kmsg_enqueue_macro(queue, kmsg);
+ const char *name = ipc_type_name64(type_name, TRUE);
+ if (name) {
+ kprintf("%s", name);
+ } else {
+ kprintf("type%d", type_name);
+ }
}
/*
- * Routine: ipc_kmsg_dequeue
- * Purpose:
- * Dequeue and return a kmsg.
+ * ipc_kmsg_print64 [ debug ]
*/
-
-ipc_kmsg_t
-ipc_kmsg_dequeue(
- ipc_kmsg_queue_t queue)
+void
+ipc_kmsg_print64(
+ ipc_kmsg_t kmsg,
+ const char *str)
{
- ipc_kmsg_t first;
-
- first = ipc_kmsg_queue_first(queue);
-
- if (first != IKM_NULL)
- ipc_kmsg_rmqueue_first_macro(queue, first);
+ kprintf("%s kmsg=%p:\n", str, kmsg);
+ kprintf(" next=%p, prev=%p, size=%d",
+ kmsg->ikm_next,
+ kmsg->ikm_prev,
+ kmsg->ikm_size);
+ kprintf("\n");
+ ipc_msg_print64(kmsg->ikm_header);
+}
- return first;
+const char *
+msgh_bit_decode64(
+ mach_msg_bits_t bit)
+{
+ switch (bit) {
+ case MACH_MSGH_BITS_COMPLEX: return "complex";
+ case MACH_MSGH_BITS_CIRCULAR: return "circular";
+ default: return (char *) 0;
+ }
}
/*
- * Routine: ipc_kmsg_rmqueue
- * Purpose:
- * Pull a kmsg out of a queue.
+ * ipc_msg_print64 [ debug ]
*/
-
void
-ipc_kmsg_rmqueue(
- ipc_kmsg_queue_t queue,
- ipc_kmsg_t kmsg)
+ipc_msg_print64(
+ mach_msg_header_t *msgh)
{
- ipc_kmsg_t next, prev;
+ mach_msg_bits_t mbits;
+ unsigned int bit, i;
+ const char *bit_name;
+ int needs_comma;
- assert(queue->ikmq_base != IKM_NULL);
+ mbits = msgh->msgh_bits;
+ kprintf(" msgh_bits=0x%x: l=0x%x,r=0x%x\n",
+ mbits,
+ MACH_MSGH_BITS_LOCAL(msgh->msgh_bits),
+ MACH_MSGH_BITS_REMOTE(msgh->msgh_bits));
- next = kmsg->ikm_next;
- prev = kmsg->ikm_prev;
+ mbits = MACH_MSGH_BITS_OTHER(mbits) & MACH_MSGH_BITS_USED;
+ kprintf(" decoded bits: ");
+ needs_comma = 0;
+ for (i = 0, bit = 1; i < sizeof(mbits) * 8; ++i, bit <<= 1) {
+ if ((mbits & bit) == 0) {
+ continue;
+ }
+ bit_name = msgh_bit_decode64((mach_msg_bits_t)bit);
+ if (bit_name) {
+ kprintf("%s%s", needs_comma ? "," : "", bit_name);
+ } else {
+ kprintf("%sunknown(0x%x),", needs_comma ? "," : "", bit);
+ }
+ ++needs_comma;
+ }
+ if (msgh->msgh_bits & ~MACH_MSGH_BITS_USED) {
+ kprintf("%sunused=0x%x,", needs_comma ? "," : "",
+ msgh->msgh_bits & ~MACH_MSGH_BITS_USED);
+ }
+ kprintf("\n");
- if (next == kmsg) {
- assert(prev == kmsg);
- assert(queue->ikmq_base == kmsg);
+ needs_comma = 1;
+ if (msgh->msgh_remote_port) {
+ kprintf(" remote=%p(", msgh->msgh_remote_port);
+ ipc_print_type_name64(MACH_MSGH_BITS_REMOTE(msgh->msgh_bits));
+ kprintf(")");
+ } else {
+ kprintf(" remote=null");
+ }
- queue->ikmq_base = IKM_NULL;
+ if (msgh->msgh_local_port) {
+ kprintf("%slocal=%p(", needs_comma ? "," : "",
+ msgh->msgh_local_port);
+ ipc_print_type_name64(MACH_MSGH_BITS_LOCAL(msgh->msgh_bits));
+ kprintf(")\n");
} else {
- if (queue->ikmq_base == kmsg)
- queue->ikmq_base = next;
+ kprintf("local=null\n");
+ }
- next->ikm_prev = prev;
- prev->ikm_next = next;
+ kprintf(" msgh_id=%d, size=%d\n",
+ msgh->msgh_id,
+ msgh->msgh_size);
+
+ if (mbits & MACH_MSGH_BITS_COMPLEX) {
+ ipc_msg_print_untyped64((mach_msg_body_t *) (msgh + 1));
}
- /* XXX Temporary debug logic */
- assert(kmsg->ikm_next = IKM_BOGUS);
- assert(kmsg->ikm_prev = IKM_BOGUS);
+
+ ipc_msg_body_print64((void *)(msgh + 1), msgh->msgh_size);
}
-/*
- * Routine: ipc_kmsg_queue_next
- * Purpose:
- * Return the kmsg following the given kmsg.
- * (Or IKM_NULL if it is the last one in the queue.)
- */
-ipc_kmsg_t
-ipc_kmsg_queue_next(
- ipc_kmsg_queue_t queue,
- ipc_kmsg_t kmsg)
+const char *
+mm_copy_options_string64(
+ mach_msg_copy_options_t option)
{
- ipc_kmsg_t next;
-
- assert(queue->ikmq_base != IKM_NULL);
-
- next = kmsg->ikm_next;
- if (queue->ikmq_base == next)
- next = IKM_NULL;
+ const char *name;
- return next;
+ switch (option) {
+ case MACH_MSG_PHYSICAL_COPY:
+ name = "PHYSICAL";
+ break;
+ case MACH_MSG_VIRTUAL_COPY:
+ name = "VIRTUAL";
+ break;
+ case MACH_MSG_OVERWRITE:
+ name = "OVERWRITE(DEPRECATED)";
+ break;
+ case MACH_MSG_ALLOCATE:
+ name = "ALLOCATE";
+ break;
+ case MACH_MSG_KALLOC_COPY_T:
+ name = "KALLOC_COPY_T";
+ break;
+ default:
+ name = "unknown";
+ break;
+ }
+ return name;
}
-/*
- * Routine: ipc_kmsg_destroy
- * Purpose:
- * Destroys a kernel message. Releases all rights,
- * references, and memory held by the message.
- * Frees the message.
- * Conditions:
- * No locks held.
- */
-
void
-ipc_kmsg_destroy(
- ipc_kmsg_t kmsg)
+ipc_msg_print_untyped64(
+ mach_msg_body_t *body)
{
- ipc_kmsg_queue_t queue;
- boolean_t empty;
+ mach_msg_descriptor_t *saddr, *send;
+ mach_msg_descriptor_type_t type;
- /*
- * ipc_kmsg_clean can cause more messages to be destroyed.
- * Curtail recursion by queueing messages. If a message
- * is already queued, then this is a recursive call.
- */
+ kprintf(" %d descriptors: \n", body->msgh_descriptor_count);
- queue = &(current_thread()->ith_messages);
- empty = ipc_kmsg_queue_empty(queue);
- ipc_kmsg_enqueue(queue, kmsg);
+ saddr = (mach_msg_descriptor_t *) (body + 1);
+ send = saddr + body->msgh_descriptor_count;
- if (empty) {
- /* must leave kmsg in queue while cleaning it */
+ for (; saddr < send; saddr++) {
+ type = saddr->type.type;
- while ((kmsg = ipc_kmsg_queue_first(queue)) != IKM_NULL) {
- ipc_kmsg_clean(kmsg);
- ipc_kmsg_rmqueue(queue, kmsg);
- ipc_kmsg_free(kmsg);
- }
+ switch (type) {
+ case MACH_MSG_PORT_DESCRIPTOR: {
+ mach_msg_port_descriptor_t *dsc;
+
+ dsc = &saddr->port;
+ kprintf(" PORT name = %p disp = ", dsc->name);
+ ipc_print_type_name64(dsc->disposition);
+ kprintf("\n");
+ break;
+ }
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR: {
+ mach_msg_ool_descriptor_t *dsc;
+
+ dsc = (mach_msg_ool_descriptor_t *) &saddr->out_of_line;
+ kprintf(" OOL%s addr = %p size = 0x%x copy = %s %s\n",
+ type == MACH_MSG_OOL_DESCRIPTOR ? "" : " VOLATILE",
+ dsc->address, dsc->size,
+ mm_copy_options_string64(dsc->copy),
+ dsc->deallocate ? "DEALLOC" : "");
+ break;
+ }
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
+ mach_msg_ool_ports_descriptor_t *dsc;
+
+ dsc = (mach_msg_ool_ports_descriptor_t *) &saddr->ool_ports;
+
+ kprintf(" OOL_PORTS addr = %p count = 0x%x ",
+ dsc->address, dsc->count);
+ kprintf("disp = ");
+ ipc_print_type_name64(dsc->disposition);
+ kprintf(" copy = %s %s\n",
+ mm_copy_options_string64(dsc->copy),
+ dsc->deallocate ? "DEALLOC" : "");
+ break;
+ }
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR: {
+ mach_msg_guarded_port_descriptor_t *dsc;
+
+ dsc = (mach_msg_guarded_port_descriptor_t *)&saddr->guarded_port;
+ kprintf(" GUARDED_PORT name = %p flags = 0x%x disp = ", dsc->name, dsc->flags);
+ ipc_print_type_name64(dsc->disposition);
+ kprintf("\n");
+ break;
+ }
+ default: {
+ kprintf(" UNKNOWN DESCRIPTOR 0x%x\n", type);
+ break;
+ }
+ }
}
}
+#define DEBUG_IPC_KMSG_PRINT(kmsg, string) \
+ __unreachable_ok_push \
+ if (DEBUG_KPRINT_SYSCALL_PREDICATE(DEBUG_KPRINT_SYSCALL_IPC_MASK)) { \
+ ipc_kmsg_print64(kmsg, string); \
+ } \
+ __unreachable_ok_pop
+
+#define DEBUG_IPC_MSG_BODY_PRINT(body, size) \
+ __unreachable_ok_push \
+ if (DEBUG_KPRINT_SYSCALL_PREDICATE(DEBUG_KPRINT_SYSCALL_IPC_MASK)) { \
+ ipc_msg_body_print64(body,size);\
+ } \
+ __unreachable_ok_pop
+#else /* !DEBUG_MSGS_K64 */
+#define DEBUG_IPC_KMSG_PRINT(kmsg, string)
+#define DEBUG_IPC_MSG_BODY_PRINT(body, size)
+#endif /* !DEBUG_MSGS_K64 */
+
+extern vm_map_t ipc_kernel_copy_map;
+extern vm_size_t ipc_kmsg_max_space;
+extern vm_size_t ipc_kmsg_max_vm_space;
+extern vm_size_t ipc_kmsg_max_body_space;
+extern vm_size_t msg_ool_size_small;
+
+#define MSG_OOL_SIZE_SMALL msg_ool_size_small
+
+#if defined(__LP64__)
+#define MAP_SIZE_DIFFERS(map) (map->max_offset < MACH_VM_MAX_ADDRESS)
+#define OTHER_OOL_DESCRIPTOR mach_msg_ool_descriptor32_t
+#define OTHER_OOL_PORTS_DESCRIPTOR mach_msg_ool_ports_descriptor32_t
+#else
+#define MAP_SIZE_DIFFERS(map) (map->max_offset > VM_MAX_ADDRESS)
+#define OTHER_OOL_DESCRIPTOR mach_msg_ool_descriptor64_t
+#define OTHER_OOL_PORTS_DESCRIPTOR mach_msg_ool_ports_descriptor64_t
+#endif
+
+#define DESC_SIZE_ADJUSTMENT ((mach_msg_size_t)(sizeof(mach_msg_ool_descriptor64_t) - \
+ sizeof(mach_msg_ool_descriptor32_t)))
+
+/* scatter list macros */
+
+#define SKIP_PORT_DESCRIPTORS(s, c) \
+MACRO_BEGIN \
+ if ((s) != MACH_MSG_DESCRIPTOR_NULL) { \
+ while ((c) > 0) { \
+ if ((s)->type.type != MACH_MSG_PORT_DESCRIPTOR) \
+ break; \
+ (s)++; (c)--; \
+ } \
+ if (c == 0) \
+ (s) = MACH_MSG_DESCRIPTOR_NULL; \
+ } \
+MACRO_END
+
+#define INCREMENT_SCATTER(s, c, d) \
+MACRO_BEGIN \
+ if ((s) != MACH_MSG_DESCRIPTOR_NULL) { \
+ s = (d) ? (mach_msg_descriptor_t *) \
+ ((OTHER_OOL_DESCRIPTOR *)(s) + 1) : \
+ (s + 1); \
+ (c)--; \
+ } \
+MACRO_END
+
+#define KMSG_TRACE_FLAG_TRACED 0x000001
+#define KMSG_TRACE_FLAG_COMPLEX 0x000002
+#define KMSG_TRACE_FLAG_OOLMEM 0x000004
+#define KMSG_TRACE_FLAG_VCPY 0x000008
+#define KMSG_TRACE_FLAG_PCPY 0x000010
+#define KMSG_TRACE_FLAG_SND64 0x000020
+#define KMSG_TRACE_FLAG_RAISEIMP 0x000040
+#define KMSG_TRACE_FLAG_APP_SRC 0x000080
+#define KMSG_TRACE_FLAG_APP_DST 0x000100
+#define KMSG_TRACE_FLAG_DAEMON_SRC 0x000200
+#define KMSG_TRACE_FLAG_DAEMON_DST 0x000400
+#define KMSG_TRACE_FLAG_DST_NDFLTQ 0x000800
+#define KMSG_TRACE_FLAG_SRC_NDFLTQ 0x001000
+#define KMSG_TRACE_FLAG_DST_SONCE 0x002000
+#define KMSG_TRACE_FLAG_SRC_SONCE 0x004000
+#define KMSG_TRACE_FLAG_CHECKIN 0x008000
+#define KMSG_TRACE_FLAG_ONEWAY 0x010000
+#define KMSG_TRACE_FLAG_IOKIT 0x020000
+#define KMSG_TRACE_FLAG_SNDRCV 0x040000
+#define KMSG_TRACE_FLAG_DSTQFULL 0x080000
+#define KMSG_TRACE_FLAG_VOUCHER 0x100000
+#define KMSG_TRACE_FLAG_TIMER 0x200000
+#define KMSG_TRACE_FLAG_SEMA 0x400000
+#define KMSG_TRACE_FLAG_DTMPOWNER 0x800000
+#define KMSG_TRACE_FLAG_GUARDED_DESC 0x1000000
+
+#define KMSG_TRACE_FLAGS_MASK 0x1ffffff
+#define KMSG_TRACE_FLAGS_SHIFT 8
+
+#define KMSG_TRACE_PORTS_MASK 0xff
+#define KMSG_TRACE_PORTS_SHIFT 0
+
+#if (KDEBUG_LEVEL >= KDEBUG_LEVEL_STANDARD)
+#include <stdint.h>
+
+void
+ipc_kmsg_trace_send(ipc_kmsg_t kmsg,
+ mach_msg_option_t option)
+{
+ task_t send_task = TASK_NULL;
+ ipc_port_t dst_port, src_port;
+ boolean_t is_task_64bit;
+ mach_msg_header_t *msg;
+ mach_msg_trailer_t *trailer;
+
+ int kotype = 0;
+ uint32_t msg_size = 0;
+ uint64_t msg_flags = KMSG_TRACE_FLAG_TRACED;
+ uint32_t num_ports = 0;
+ uint32_t send_pid, dst_pid;
+
+ /*
+ * check to see not only if ktracing is enabled, but if we will
+ * _actually_ emit the KMSG_INFO tracepoint. This saves us a
+ * significant amount of processing (and a port lock hold) in
+ * the non-tracing case.
+ */
+ if (__probable((kdebug_enable & KDEBUG_TRACE) == 0)) {
+ return;
+ }
+ if (!kdebug_debugid_enabled(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO))) {
+ return;
+ }
+
+ msg = kmsg->ikm_header;
+
+ dst_port = msg->msgh_remote_port;
+ if (!IPC_PORT_VALID(dst_port)) {
+ return;
+ }
+
+ /*
+ * Message properties / options
+ */
+ if ((option & (MACH_SEND_MSG | MACH_RCV_MSG)) == (MACH_SEND_MSG | MACH_RCV_MSG)) {
+ msg_flags |= KMSG_TRACE_FLAG_SNDRCV;
+ }
+
+ if (msg->msgh_id >= is_iokit_subsystem.start &&
+ msg->msgh_id < is_iokit_subsystem.end + 100) {
+ msg_flags |= KMSG_TRACE_FLAG_IOKIT;
+ }
+ /* magic XPC checkin message id (XPC_MESSAGE_ID_CHECKIN) from libxpc */
+ else if (msg->msgh_id == 0x77303074u /* w00t */) {
+ msg_flags |= KMSG_TRACE_FLAG_CHECKIN;
+ }
+
+ if (msg->msgh_bits & MACH_MSGH_BITS_RAISEIMP) {
+ msg_flags |= KMSG_TRACE_FLAG_RAISEIMP;
+ }
+
+ if (unsafe_convert_port_to_voucher(kmsg->ikm_voucher)) {
+ msg_flags |= KMSG_TRACE_FLAG_VOUCHER;
+ }
+
+ /*
+ * Sending task / port
+ */
+ send_task = current_task();
+ send_pid = task_pid(send_task);
+
+ if (send_pid != 0) {
+ if (task_is_daemon(send_task)) {
+ msg_flags |= KMSG_TRACE_FLAG_DAEMON_SRC;
+ } else if (task_is_app(send_task)) {
+ msg_flags |= KMSG_TRACE_FLAG_APP_SRC;
+ }
+ }
+
+ is_task_64bit = (send_task->map->max_offset > VM_MAX_ADDRESS);
+ if (is_task_64bit) {
+ msg_flags |= KMSG_TRACE_FLAG_SND64;
+ }
+
+ src_port = msg->msgh_local_port;
+ if (src_port) {
+ if (src_port->ip_messages.imq_qlimit != MACH_PORT_QLIMIT_DEFAULT) {
+ msg_flags |= KMSG_TRACE_FLAG_SRC_NDFLTQ;
+ }
+ switch (MACH_MSGH_BITS_LOCAL(msg->msgh_bits)) {
+ case MACH_MSG_TYPE_MOVE_SEND_ONCE:
+ msg_flags |= KMSG_TRACE_FLAG_SRC_SONCE;
+ break;
+ default:
+ break;
+ }
+ } else {
+ msg_flags |= KMSG_TRACE_FLAG_ONEWAY;
+ }
+
+
+ /*
+ * Destination task / port
+ */
+ ip_lock(dst_port);
+ if (!ip_active(dst_port)) {
+ /* dst port is being torn down */
+ dst_pid = (uint32_t)0xfffffff0;
+ } else if (dst_port->ip_tempowner) {
+ msg_flags |= KMSG_TRACE_FLAG_DTMPOWNER;
+ if (IIT_NULL != dst_port->ip_imp_task) {
+ dst_pid = task_pid(dst_port->ip_imp_task->iit_task);
+ } else {
+ dst_pid = (uint32_t)0xfffffff1;
+ }
+ } else if (dst_port->ip_receiver_name == MACH_PORT_NULL) {
+ /* dst_port is otherwise in-transit */
+ dst_pid = (uint32_t)0xfffffff2;
+ } else {
+ if (dst_port->ip_receiver == ipc_space_kernel) {
+ dst_pid = 0;
+ } else {
+ ipc_space_t dst_space;
+ dst_space = dst_port->ip_receiver;
+ if (dst_space && is_active(dst_space)) {
+ dst_pid = task_pid(dst_space->is_task);
+ if (task_is_daemon(dst_space->is_task)) {
+ msg_flags |= KMSG_TRACE_FLAG_DAEMON_DST;
+ } else if (task_is_app(dst_space->is_task)) {
+ msg_flags |= KMSG_TRACE_FLAG_APP_DST;
+ }
+ } else {
+ /* receiving task is being torn down */
+ dst_pid = (uint32_t)0xfffffff3;
+ }
+ }
+ }
+
+ if (dst_port->ip_messages.imq_qlimit != MACH_PORT_QLIMIT_DEFAULT) {
+ msg_flags |= KMSG_TRACE_FLAG_DST_NDFLTQ;
+ }
+ if (imq_full(&dst_port->ip_messages)) {
+ msg_flags |= KMSG_TRACE_FLAG_DSTQFULL;
+ }
+
+ kotype = ip_kotype(dst_port);
+
+ ip_unlock(dst_port);
+
+ switch (kotype) {
+ case IKOT_SEMAPHORE:
+ msg_flags |= KMSG_TRACE_FLAG_SEMA;
+ break;
+ case IKOT_TIMER:
+ case IKOT_CLOCK:
+ msg_flags |= KMSG_TRACE_FLAG_TIMER;
+ break;
+ case IKOT_MASTER_DEVICE:
+ case IKOT_IOKIT_CONNECT:
+ case IKOT_IOKIT_OBJECT:
+ case IKOT_IOKIT_IDENT:
+ case IKOT_UEXT_OBJECT:
+ msg_flags |= KMSG_TRACE_FLAG_IOKIT;
+ break;
+ default:
+ break;
+ }
+
+ switch (MACH_MSGH_BITS_REMOTE(msg->msgh_bits)) {
+ case MACH_MSG_TYPE_PORT_SEND_ONCE:
+ msg_flags |= KMSG_TRACE_FLAG_DST_SONCE;
+ break;
+ default:
+ break;
+ }
+
+
+ /*
+ * Message size / content
+ */
+ msg_size = msg->msgh_size - sizeof(mach_msg_header_t);
+
+ if (msg->msgh_bits & MACH_MSGH_BITS_COMPLEX) {
+ mach_msg_body_t *msg_body;
+ mach_msg_descriptor_t *kern_dsc;
+ int dsc_count;
+
+ msg_flags |= KMSG_TRACE_FLAG_COMPLEX;
+
+ msg_body = (mach_msg_body_t *)(kmsg->ikm_header + 1);
+ dsc_count = (int)msg_body->msgh_descriptor_count;
+ kern_dsc = (mach_msg_descriptor_t *)(msg_body + 1);
+
+ /* this is gross: see ipc_kmsg_copyin_body()... */
+ if (!is_task_64bit) {
+ msg_size -= (dsc_count * 12);
+ }
+
+ for (int i = 0; i < dsc_count; i++) {
+ switch (kern_dsc[i].type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR:
+ num_ports++;
+ if (is_task_64bit) {
+ msg_size -= 12;
+ }
+ break;
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR: {
+ mach_msg_ool_descriptor_t *dsc;
+ dsc = (mach_msg_ool_descriptor_t *)&kern_dsc[i];
+ msg_flags |= KMSG_TRACE_FLAG_OOLMEM;
+ msg_size += dsc->size;
+ if ((dsc->size >= MSG_OOL_SIZE_SMALL) &&
+ (dsc->copy == MACH_MSG_PHYSICAL_COPY) &&
+ !dsc->deallocate) {
+ msg_flags |= KMSG_TRACE_FLAG_PCPY;
+ } else if (dsc->size <= MSG_OOL_SIZE_SMALL) {
+ msg_flags |= KMSG_TRACE_FLAG_PCPY;
+ } else {
+ msg_flags |= KMSG_TRACE_FLAG_VCPY;
+ }
+ if (is_task_64bit) {
+ msg_size -= 16;
+ }
+ } break;
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
+ mach_msg_ool_ports_descriptor_t *dsc;
+ dsc = (mach_msg_ool_ports_descriptor_t *)&kern_dsc[i];
+ num_ports += dsc->count;
+ if (is_task_64bit) {
+ msg_size -= 16;
+ }
+ } break;
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ num_ports++;
+ msg_flags |= KMSG_TRACE_FLAG_GUARDED_DESC;
+ if (is_task_64bit) {
+ msg_size -= 16;
+ }
+ default:
+ break;
+ }
+ }
+ }
+
+ /*
+ * Trailer contents
+ */
+ trailer = (mach_msg_trailer_t *)((vm_offset_t)msg +
+ round_msg((vm_offset_t)msg->msgh_size));
+ if (trailer->msgh_trailer_size <= sizeof(mach_msg_security_trailer_t)) {
+ extern const security_token_t KERNEL_SECURITY_TOKEN;
+ mach_msg_security_trailer_t *strailer;
+ strailer = (mach_msg_security_trailer_t *)trailer;
+ /*
+ * verify the sender PID: replies from the kernel often look
+ * like self-talk because the sending port is not reset.
+ */
+ if (memcmp(&strailer->msgh_sender,
+ &KERNEL_SECURITY_TOKEN,
+ sizeof(KERNEL_SECURITY_TOKEN)) == 0) {
+ send_pid = 0;
+ msg_flags &= ~(KMSG_TRACE_FLAG_APP_SRC | KMSG_TRACE_FLAG_DAEMON_SRC);
+ }
+ }
+
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO) | DBG_FUNC_END,
+ (uintptr_t)send_pid,
+ (uintptr_t)dst_pid,
+ (uintptr_t)msg_size,
+ (uintptr_t)(
+ ((msg_flags & KMSG_TRACE_FLAGS_MASK) << KMSG_TRACE_FLAGS_SHIFT) |
+ ((num_ports & KMSG_TRACE_PORTS_MASK) << KMSG_TRACE_PORTS_SHIFT)
+ )
+ );
+}
+#endif
+
+/* zone for cached ipc_kmsg_t structures */
+zone_t ipc_kmsg_zone;
+
+/*
+ * Forward declarations
+ */
+
+void ipc_kmsg_clean(
+ ipc_kmsg_t kmsg);
+
+void ipc_kmsg_clean_body(
+ ipc_kmsg_t kmsg,
+ mach_msg_type_number_t number,
+ mach_msg_descriptor_t *desc);
+
+void ipc_kmsg_clean_partial(
+ ipc_kmsg_t kmsg,
+ mach_msg_type_number_t number,
+ mach_msg_descriptor_t *desc,
+ vm_offset_t paddr,
+ vm_size_t length);
+
+mach_msg_return_t ipc_kmsg_copyin_body(
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ vm_map_t map,
+ mach_msg_option_t *optionp);
+
+
+extern int enforce_strict_reply;
+
+static void
+ipc_kmsg_link_reply_context_locked(
+ ipc_port_t reply_port,
+ ipc_port_t voucher_port);
+
+static kern_return_t
+ipc_kmsg_validate_reply_port_locked(
+ ipc_port_t reply_port,
+ mach_msg_option_t options);
+
+static mach_msg_return_t
+ipc_kmsg_validate_reply_context_locked(
+ mach_msg_option_t option,
+ ipc_port_t dest_port,
+ ipc_voucher_t voucher,
+ mach_port_name_t voucher_name);
+
+/* we can't include the BSD <sys/persona.h> header here... */
+#ifndef PERSONA_ID_NONE
+#define PERSONA_ID_NONE ((uint32_t)-1)
+#endif
+
+/*
+ * We keep a per-processor cache of kernel message buffers.
+ * The cache saves the overhead/locking of using kalloc/kfree.
+ * The per-processor cache seems to miss less than a per-thread cache,
+ * and it also uses less memory. Access to the cache doesn't
+ * require locking.
+ */
+
+/*
+ * Routine: ipc_kmsg_alloc
+ * Purpose:
+ * Allocate a kernel message structure. If we can get one from
+ * the cache, that is best. Otherwise, allocate a new one.
+ * Conditions:
+ * Nothing locked.
+ */
+ipc_kmsg_t
+ipc_kmsg_alloc(
+ mach_msg_size_t msg_and_trailer_size)
+{
+ mach_msg_size_t max_expanded_size;
+ ipc_kmsg_t kmsg;
+
+ /*
+ * LP64support -
+ * Pad the allocation in case we need to expand the
+ * message descriptors for user spaces with pointers larger than
+ * the kernel's own, or vice versa. We don't know how many descriptors
+ * there are yet, so just assume the whole body could be
+ * descriptors (if there could be any at all).
+ *
+ * The expansion space is left in front of the header,
+ * because it is easier to pull the header and descriptors
+ * forward as we process them than it is to push all the
+ * data backwards.
+ */
+ mach_msg_size_t size = msg_and_trailer_size - MAX_TRAILER_SIZE;
+
+ /* compare against implementation upper limit for the body */
+ if (size > ipc_kmsg_max_body_space) {
+ return IKM_NULL;
+ }
+
+ if (size > sizeof(mach_msg_base_t)) {
+ mach_msg_size_t max_desc = (mach_msg_size_t)(((size - sizeof(mach_msg_base_t)) /
+ sizeof(mach_msg_ool_descriptor32_t)) *
+ DESC_SIZE_ADJUSTMENT);
+
+ /* make sure expansion won't cause wrap */
+ if (msg_and_trailer_size > MACH_MSG_SIZE_MAX - max_desc) {
+ return IKM_NULL;
+ }
+
+ max_expanded_size = msg_and_trailer_size + max_desc;
+ } else {
+ max_expanded_size = msg_and_trailer_size;
+ }
+
+ if (max_expanded_size < IKM_SAVED_MSG_SIZE) {
+ max_expanded_size = IKM_SAVED_MSG_SIZE; /* round up for ikm_cache */
+ }
+ if (max_expanded_size == IKM_SAVED_MSG_SIZE) {
+ kmsg = (ipc_kmsg_t)zalloc(ipc_kmsg_zone);
+ } else {
+ kmsg = (ipc_kmsg_t)kalloc(ikm_plus_overhead(max_expanded_size));
+ }
+
+ if (kmsg != IKM_NULL) {
+ ikm_init(kmsg, max_expanded_size);
+ ikm_set_header(kmsg, msg_and_trailer_size);
+ }
+
+ return kmsg;
+}
+
/*
- * Routine: ipc_kmsg_destroy_dest
+ * Routine: ipc_kmsg_free
+ * Purpose:
+ * Free a kernel message buffer. If the kms is preallocated
+ * to a port, just "put it back (marked unused)." We have to
+ * do this with the port locked. The port may have its hold
+ * on our message released. In that case, we have to just
+ * revert the message to a traditional one and free it normally.
+ * Conditions:
+ * Nothing locked.
+ */
+
+void
+ipc_kmsg_free(
+ ipc_kmsg_t kmsg)
+{
+ mach_msg_size_t size = kmsg->ikm_size;
+ ipc_port_t port;
+
+ assert(!IP_VALID(kmsg->ikm_voucher));
+
+ KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_FREE) | DBG_FUNC_NONE,
+ VM_KERNEL_ADDRPERM((uintptr_t)kmsg),
+ 0, 0, 0, 0);
+
+ /*
+ * Check to see if the message is bound to the port. If so,
+ * mark it not in use. If the port isn't already dead, then
+ * leave the message associated with it. Otherwise, free it.
+ */
+ port = ikm_prealloc_inuse_port(kmsg);
+ if (port != IP_NULL) {
+ ip_lock(port);
+ ikm_prealloc_clear_inuse(kmsg, port);
+ if (ip_active(port) && (port->ip_premsg == kmsg)) {
+ assert(IP_PREALLOC(port));
+ ip_unlock(port);
+ ip_release(port);
+ return;
+ }
+ ip_unlock(port);
+ ip_release(port); /* May be last reference */
+ }
+
+ if (kmsg->ikm_size == IKM_SAVED_MSG_SIZE) {
+ zfree(ipc_kmsg_zone, kmsg);
+ return;
+ }
+ kfree(kmsg, ikm_plus_overhead(size));
+}
+
+
+/*
+ * Routine: ipc_kmsg_enqueue
+ * Purpose:
+ * Enqueue a kmsg.
+ */
+
+void
+ipc_kmsg_enqueue(
+ ipc_kmsg_queue_t queue,
+ ipc_kmsg_t kmsg)
+{
+ ipc_kmsg_t first = queue->ikmq_base;
+ ipc_kmsg_t last;
+
+ if (first == IKM_NULL) {
+ queue->ikmq_base = kmsg;
+ kmsg->ikm_next = kmsg;
+ kmsg->ikm_prev = kmsg;
+ } else {
+ last = first->ikm_prev;
+ kmsg->ikm_next = first;
+ kmsg->ikm_prev = last;
+ first->ikm_prev = kmsg;
+ last->ikm_next = kmsg;
+ }
+}
+
+/*
+ * Routine: ipc_kmsg_enqueue_qos
+ * Purpose:
+ * Enqueue a kmsg, propagating qos
+ * overrides towards the head of the queue.
+ *
+ * Returns:
+ * whether the head of the queue had
+ * it's override-qos adjusted because
+ * of this insertion.
+ */
+
+boolean_t
+ipc_kmsg_enqueue_qos(
+ ipc_kmsg_queue_t queue,
+ ipc_kmsg_t kmsg)
+{
+ ipc_kmsg_t first = queue->ikmq_base;
+ ipc_kmsg_t prev;
+ mach_msg_priority_t override;
+
+ if (first == IKM_NULL) {
+ /* insert a first message */
+ queue->ikmq_base = kmsg;
+ kmsg->ikm_next = kmsg;
+ kmsg->ikm_prev = kmsg;
+ return TRUE;
+ }
+
+ /* insert at the tail */
+ prev = first->ikm_prev;
+ kmsg->ikm_next = first;
+ kmsg->ikm_prev = prev;
+ first->ikm_prev = kmsg;
+ prev->ikm_next = kmsg;
+
+ /* apply QoS overrides towards the head */
+ override = kmsg->ikm_qos_override;
+ while (prev != kmsg &&
+ override > prev->ikm_qos_override) {
+ prev->ikm_qos_override = override;
+ prev = prev->ikm_prev;
+ }
+
+ /* did we adjust everything? */
+ return prev == kmsg;
+}
+
+/*
+ * Routine: ipc_kmsg_override_qos
+ * Purpose:
+ * Update the override for a given kmsg already
+ * enqueued, propagating qos override adjustments
+ * towards the head of the queue.
+ *
+ * Returns:
+ * whether the head of the queue had
+ * it's override-qos adjusted because
+ * of this insertion.
+ */
+
+boolean_t
+ipc_kmsg_override_qos(
+ ipc_kmsg_queue_t queue,
+ ipc_kmsg_t kmsg,
+ mach_msg_priority_t override)
+{
+ ipc_kmsg_t first = queue->ikmq_base;
+ ipc_kmsg_t cur = kmsg;
+
+ /* apply QoS overrides towards the head */
+ while (override > cur->ikm_qos_override) {
+ cur->ikm_qos_override = override;
+ if (cur == first) {
+ return TRUE;
+ }
+ cur = cur->ikm_prev;
+ }
+ return FALSE;
+}
+
+/*
+ * Routine: ipc_kmsg_dequeue
+ * Purpose:
+ * Dequeue and return a kmsg.
+ */
+
+ipc_kmsg_t
+ipc_kmsg_dequeue(
+ ipc_kmsg_queue_t queue)
+{
+ ipc_kmsg_t first;
+
+ first = ipc_kmsg_queue_first(queue);
+
+ if (first != IKM_NULL) {
+ ipc_kmsg_rmqueue(queue, first);
+ }
+
+ return first;
+}
+
+/*
+ * Routine: ipc_kmsg_rmqueue
+ * Purpose:
+ * Pull a kmsg out of a queue.
+ */
+
+void
+ipc_kmsg_rmqueue(
+ ipc_kmsg_queue_t queue,
+ ipc_kmsg_t kmsg)
+{
+ ipc_kmsg_t next, prev;
+
+ assert(queue->ikmq_base != IKM_NULL);
+
+ next = kmsg->ikm_next;
+ prev = kmsg->ikm_prev;
+
+ if (next == kmsg) {
+ assert(prev == kmsg);
+ assert(queue->ikmq_base == kmsg);
+
+ queue->ikmq_base = IKM_NULL;
+ } else {
+ if (__improbable(next->ikm_prev != kmsg || prev->ikm_next != kmsg)) {
+ panic("ipc_kmsg_rmqueue: inconsistent prev/next pointers. "
+ "(prev->next: %p, next->prev: %p, kmsg: %p)",
+ prev->ikm_next, next->ikm_prev, kmsg);
+ }
+
+ if (queue->ikmq_base == kmsg) {
+ queue->ikmq_base = next;
+ }
+
+ next->ikm_prev = prev;
+ prev->ikm_next = next;
+ }
+ /* XXX Temporary debug logic */
+ assert((kmsg->ikm_next = IKM_BOGUS) == IKM_BOGUS);
+ assert((kmsg->ikm_prev = IKM_BOGUS) == IKM_BOGUS);
+}
+
+/*
+ * Routine: ipc_kmsg_queue_next
+ * Purpose:
+ * Return the kmsg following the given kmsg.
+ * (Or IKM_NULL if it is the last one in the queue.)
+ */
+
+ipc_kmsg_t
+ipc_kmsg_queue_next(
+ ipc_kmsg_queue_t queue,
+ ipc_kmsg_t kmsg)
+{
+ ipc_kmsg_t next;
+
+ assert(queue->ikmq_base != IKM_NULL);
+
+ next = kmsg->ikm_next;
+ if (queue->ikmq_base == next) {
+ next = IKM_NULL;
+ }
+
+ return next;
+}
+
+/*
+ * Routine: ipc_kmsg_destroy
* Purpose:
* Destroys a kernel message. Releases all rights,
- * references, and memory held by the message (including
- * the destination port reference.
+ * references, and memory held by the message.
* Frees the message.
* Conditions:
* No locks held.
*/
+
void
-ipc_kmsg_destroy_dest(
+ipc_kmsg_destroy(
+ ipc_kmsg_t kmsg)
+{
+ /*
+ * Destroying a message can cause more messages to be destroyed.
+ * Curtail recursion by putting messages on the deferred
+ * destruction queue. If this was the first message on the
+ * queue, this instance must process the full queue.
+ */
+ if (ipc_kmsg_delayed_destroy(kmsg)) {
+ ipc_kmsg_reap_delayed();
+ }
+}
+
+/*
+ * Routine: ipc_kmsg_delayed_destroy
+ * Purpose:
+ * Enqueues a kernel message for deferred destruction.
+ * Returns:
+ * Boolean indicator that the caller is responsible to reap
+ * deferred messages.
+ */
+
+boolean_t
+ipc_kmsg_delayed_destroy(
ipc_kmsg_t kmsg)
{
- ipc_port_t port;
-
- port = kmsg->ikm_header->msgh_remote_port;
+ ipc_kmsg_queue_t queue = &(current_thread()->ith_messages);
+ boolean_t first = ipc_kmsg_queue_empty(queue);
+
+ ipc_kmsg_enqueue(queue, kmsg);
+ return first;
+}
+
+/*
+ * Routine: ipc_kmsg_destroy_queue
+ * Purpose:
+ * Destroys messages from the per-thread
+ * deferred reaping queue.
+ * Conditions:
+ * No locks held.
+ */
+
+void
+ipc_kmsg_reap_delayed(void)
+{
+ ipc_kmsg_queue_t queue = &(current_thread()->ith_messages);
+ ipc_kmsg_t kmsg;
- ipc_port_release(port);
- kmsg->ikm_header->msgh_remote_port = MACH_PORT_NULL;
- ipc_kmsg_destroy(kmsg);
+ /*
+ * must leave kmsg in queue while cleaning it to assure
+ * no nested calls recurse into here.
+ */
+ while ((kmsg = ipc_kmsg_queue_first(queue)) != IKM_NULL) {
+ ipc_kmsg_clean(kmsg);
+ ipc_kmsg_rmqueue(queue, kmsg);
+ ipc_kmsg_free(kmsg);
+ }
}
/*
* Conditions:
* No locks held.
*/
-
+static unsigned int _ipc_kmsg_clean_invalid_desc = 0;
void
ipc_kmsg_clean_body(
- __unused ipc_kmsg_t kmsg,
- mach_msg_type_number_t number,
- mach_msg_descriptor_t *saddr)
+ __unused ipc_kmsg_t kmsg,
+ mach_msg_type_number_t number,
+ mach_msg_descriptor_t *saddr)
{
- mach_msg_descriptor_t *eaddr;
-
- if ( number == 0 )
- return;
+ mach_msg_type_number_t i;
- eaddr = saddr + number;
+ if (number == 0) {
+ return;
+ }
- for ( ; saddr < eaddr; saddr++ ) {
-
- switch (saddr->type.type) {
-
- case MACH_MSG_PORT_DESCRIPTOR: {
- mach_msg_port_descriptor_t *dsc;
+ for (i = 0; i < number; i++, saddr++) {
+ switch (saddr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR: {
+ mach_msg_port_descriptor_t *dsc;
- dsc = &saddr->port;
+ dsc = &saddr->port;
- /*
- * Destroy port rights carried in the message
- */
- if (!IO_VALID((ipc_object_t) dsc->name))
- continue;
- ipc_object_destroy((ipc_object_t) dsc->name, dsc->disposition);
- break;
- }
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_DESCRIPTOR : {
- mach_msg_ool_descriptor_t *dsc;
-
- dsc = &saddr->out_of_line;
-
- /*
- * Destroy memory carried in the message
- */
- if (dsc->size == 0) {
- assert(dsc->address == (void *) 0);
- } else {
- vm_map_copy_discard((vm_map_copy_t) dsc->address);
+ /*
+ * Destroy port rights carried in the message
+ */
+ if (!IP_VALID(dsc->name)) {
+ continue;
+ }
+ ipc_object_destroy(ip_to_object(dsc->name), dsc->disposition);
+ break;
}
- break;
- }
- case MACH_MSG_OOL_PORTS_DESCRIPTOR : {
- ipc_object_t *objects;
- mach_msg_type_number_t j;
- mach_msg_ool_ports_descriptor_t *dsc;
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR: {
+ mach_msg_ool_descriptor_t *dsc;
- dsc = &saddr->ool_ports;
- objects = (ipc_object_t *) dsc->address;
+ dsc = (mach_msg_ool_descriptor_t *)&saddr->out_of_line;
- if (dsc->count == 0) {
+ /*
+ * Destroy memory carried in the message
+ */
+ if (dsc->size == 0) {
+ assert(dsc->address == (void *) 0);
+ } else {
+ vm_map_copy_discard((vm_map_copy_t) dsc->address);
+ }
break;
}
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
+ ipc_object_t *objects;
+ mach_msg_type_number_t j;
+ mach_msg_ool_ports_descriptor_t *dsc;
- assert(objects != (ipc_object_t *) 0);
-
- /* destroy port rights carried in the message */
-
- for (j = 0; j < dsc->count; j++) {
- ipc_object_t object = objects[j];
-
- if (!IO_VALID(object))
- continue;
-
- ipc_object_destroy(object, dsc->disposition);
- }
+ dsc = (mach_msg_ool_ports_descriptor_t *)&saddr->ool_ports;
+ objects = (ipc_object_t *) dsc->address;
+
+ if (dsc->count == 0) {
+ break;
+ }
- /* destroy memory carried in the message */
+ assert(objects != (ipc_object_t *) 0);
- assert(dsc->count != 0);
+ /* destroy port rights carried in the message */
- kfree(dsc->address,
- (vm_size_t) dsc->count * sizeof(mach_port_name_t));
- break;
- }
- default : {
- printf("cleanup: don't understand this type of descriptor\n");
- }
+ for (j = 0; j < dsc->count; j++) {
+ ipc_object_t object = objects[j];
+
+ if (!IO_VALID(object)) {
+ continue;
+ }
+
+ ipc_object_destroy(object, dsc->disposition);
+ }
+
+ /* destroy memory carried in the message */
+
+ assert(dsc->count != 0);
+
+ kfree(dsc->address,
+ (vm_size_t) dsc->count * sizeof(mach_port_t));
+ break;
+ }
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR: {
+ mach_msg_guarded_port_descriptor_t *dsc = (typeof(dsc)) & saddr->guarded_port;
+
+ /*
+ * Destroy port rights carried in the message
+ */
+ if (!IP_VALID(dsc->name)) {
+ continue;
+ }
+ ipc_object_destroy(ip_to_object(dsc->name), dsc->disposition);
+ break;
+ }
+ default: {
+ _ipc_kmsg_clean_invalid_desc++; /* don't understand this type of descriptor */
+ }
+ }
}
- }
}
/*
void
ipc_kmsg_clean_partial(
- ipc_kmsg_t kmsg,
- mach_msg_type_number_t number,
- mach_msg_descriptor_t *desc,
- vm_offset_t paddr,
- vm_size_t length)
+ ipc_kmsg_t kmsg,
+ mach_msg_type_number_t number,
+ mach_msg_descriptor_t *desc,
+ vm_offset_t paddr,
+ vm_size_t length)
{
ipc_object_t object;
mach_msg_bits_t mbits = kmsg->ikm_header->msgh_bits;
- object = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
+ /* deal with importance chain while we still have dest and voucher references */
+ ipc_importance_clean(kmsg);
+
+ object = ip_to_object(kmsg->ikm_header->msgh_remote_port);
assert(IO_VALID(object));
- ipc_object_destroy(object, MACH_MSGH_BITS_REMOTE(mbits));
+ ipc_object_destroy_dest(object, MACH_MSGH_BITS_REMOTE(mbits));
- object = (ipc_object_t) kmsg->ikm_header->msgh_local_port;
- if (IO_VALID(object))
+ object = ip_to_object(kmsg->ikm_header->msgh_local_port);
+ if (IO_VALID(object)) {
ipc_object_destroy(object, MACH_MSGH_BITS_LOCAL(mbits));
+ }
+
+ object = ip_to_object(kmsg->ikm_voucher);
+ if (IO_VALID(object)) {
+ assert(MACH_MSGH_BITS_VOUCHER(mbits) == MACH_MSG_TYPE_MOVE_SEND);
+ ipc_object_destroy(object, MACH_MSG_TYPE_PORT_SEND);
+ kmsg->ikm_voucher = IP_NULL;
+ }
if (paddr) {
(void) vm_deallocate(ipc_kernel_copy_map, paddr, length);
void
ipc_kmsg_clean(
- ipc_kmsg_t kmsg)
+ ipc_kmsg_t kmsg)
{
ipc_object_t object;
mach_msg_bits_t mbits;
+ /* deal with importance chain while we still have dest and voucher references */
+ ipc_importance_clean(kmsg);
+
mbits = kmsg->ikm_header->msgh_bits;
- object = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
- if (IO_VALID(object))
- ipc_object_destroy(object, MACH_MSGH_BITS_REMOTE(mbits));
+ object = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ if (IO_VALID(object)) {
+ ipc_object_destroy_dest(object, MACH_MSGH_BITS_REMOTE(mbits));
+ }
- object = (ipc_object_t) kmsg->ikm_header->msgh_local_port;
- if (IO_VALID(object))
+ object = ip_to_object(kmsg->ikm_header->msgh_local_port);
+ if (IO_VALID(object)) {
ipc_object_destroy(object, MACH_MSGH_BITS_LOCAL(mbits));
+ }
+
+ object = ip_to_object(kmsg->ikm_voucher);
+ if (IO_VALID(object)) {
+ assert(MACH_MSGH_BITS_VOUCHER(mbits) == MACH_MSG_TYPE_MOVE_SEND);
+ ipc_object_destroy(object, MACH_MSG_TYPE_PORT_SEND);
+ kmsg->ikm_voucher = IP_NULL;
+ }
if (mbits & MACH_MSGH_BITS_COMPLEX) {
mach_msg_body_t *body;
body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
ipc_kmsg_clean_body(kmsg, body->msgh_descriptor_count,
- (mach_msg_descriptor_t *)(body + 1));
+ (mach_msg_descriptor_t *)(body + 1));
}
}
void
ipc_kmsg_set_prealloc(
- ipc_kmsg_t kmsg,
- ipc_port_t port)
+ ipc_kmsg_t kmsg,
+ ipc_port_t port)
{
assert(kmsg->ikm_prealloc == IP_NULL);
-
+
kmsg->ikm_prealloc = IP_NULL;
+
+ assert(port_send_turnstile(port) == TURNSTILE_NULL);
+ kmsg->ikm_turnstile = TURNSTILE_NULL;
IP_SET_PREALLOC(port, kmsg);
}
*/
void
ipc_kmsg_clear_prealloc(
- ipc_kmsg_t kmsg,
- ipc_port_t port)
+ ipc_kmsg_t kmsg,
+ ipc_port_t port)
{
- assert(kmsg->ikm_prealloc == port);
-
- kmsg->ikm_prealloc = IP_NULL;
+ /* take the mqueue lock since the turnstile is protected under it */
+ imq_lock(&port->ip_messages);
+
IP_CLEAR_PREALLOC(port, kmsg);
+ set_port_send_turnstile(port, kmsg->ikm_turnstile);
+ imq_unlock(&port->ip_messages);
}
+/*
+ * Routine: ipc_kmsg_prealloc
+ * Purpose:
+ * Wraper to ipc_kmsg_alloc() to account for
+ * header expansion requirements.
+ */
+ipc_kmsg_t
+ipc_kmsg_prealloc(mach_msg_size_t size)
+{
+#if defined(__LP64__)
+ if (size > MACH_MSG_SIZE_MAX - LEGACY_HEADER_SIZE_DELTA) {
+ return IKM_NULL;
+ }
+
+ size += LEGACY_HEADER_SIZE_DELTA;
+#endif
+ return ipc_kmsg_alloc(size);
+}
/*
* MACH_MSG_SUCCESS Acquired a message buffer.
* MACH_SEND_MSG_TOO_SMALL Message smaller than a header.
* MACH_SEND_MSG_TOO_SMALL Message size not long-word multiple.
+ * MACH_SEND_TOO_LARGE Message too large to ever be sent.
* MACH_SEND_NO_BUFFER Couldn't allocate a message buffer.
* MACH_SEND_INVALID_DATA Couldn't copy message data.
*/
mach_msg_return_t
ipc_kmsg_get(
- mach_vm_address_t msg_addr,
- mach_msg_size_t size,
- ipc_kmsg_t *kmsgp)
+ mach_vm_address_t msg_addr,
+ mach_msg_size_t size,
+ ipc_kmsg_t *kmsgp)
{
- mach_msg_size_t msg_and_trailer_size;
- ipc_kmsg_t kmsg;
- mach_msg_max_trailer_t *trailer;
-
- if ((size < sizeof(mach_msg_header_t)) || (size & 3))
+ mach_msg_size_t msg_and_trailer_size;
+ ipc_kmsg_t kmsg;
+ mach_msg_max_trailer_t *trailer;
+ mach_msg_legacy_base_t legacy_base;
+ mach_msg_size_t len_copied;
+ legacy_base.body.msgh_descriptor_count = 0;
+
+ if ((size < sizeof(mach_msg_legacy_header_t)) || (size & 3)) {
return MACH_SEND_MSG_TOO_SMALL;
+ }
- if (size > MACH_MSG_SIZE_MAX - MAX_TRAILER_SIZE)
+ if (size > ipc_kmsg_max_body_space) {
return MACH_SEND_TOO_LARGE;
+ }
- msg_and_trailer_size = size + MAX_TRAILER_SIZE;
+ if (size == sizeof(mach_msg_legacy_header_t)) {
+ len_copied = sizeof(mach_msg_legacy_header_t);
+ } else {
+ len_copied = sizeof(mach_msg_legacy_base_t);
+ }
- kmsg = ipc_kmsg_alloc(msg_and_trailer_size);
+ if (copyinmsg(msg_addr, (char *)&legacy_base, len_copied)) {
+ return MACH_SEND_INVALID_DATA;
+ }
+
+ /*
+ * If the message claims to be complex, it must at least
+ * have the length of a "base" message (header + dsc_count).
+ */
+ if (len_copied < sizeof(mach_msg_legacy_base_t) &&
+ (legacy_base.header.msgh_bits & MACH_MSGH_BITS_COMPLEX)) {
+ return MACH_SEND_MSG_TOO_SMALL;
+ }
- if (kmsg == IKM_NULL)
+ msg_addr += sizeof(legacy_base.header);
+#if defined(__LP64__)
+ size += LEGACY_HEADER_SIZE_DELTA;
+#endif
+ /* unreachable if !DEBUG */
+ __unreachable_ok_push
+ if (DEBUG_KPRINT_SYSCALL_PREDICATE(DEBUG_KPRINT_SYSCALL_IPC_MASK)) {
+ unsigned int j;
+ for (j = 0; j < sizeof(legacy_base.header); j++) {
+ kprintf("%02x\n", ((unsigned char*)&legacy_base.header)[j]);
+ }
+ }
+ __unreachable_ok_pop
+
+ msg_and_trailer_size = size + MAX_TRAILER_SIZE;
+ kmsg = ipc_kmsg_alloc(msg_and_trailer_size);
+ if (kmsg == IKM_NULL) {
return MACH_SEND_NO_BUFFER;
+ }
- if (copyinmsg(msg_addr, (char *) kmsg->ikm_header, size)) {
+ kmsg->ikm_header->msgh_size = size;
+ kmsg->ikm_header->msgh_bits = legacy_base.header.msgh_bits;
+ kmsg->ikm_header->msgh_remote_port = CAST_MACH_NAME_TO_PORT(legacy_base.header.msgh_remote_port);
+ kmsg->ikm_header->msgh_local_port = CAST_MACH_NAME_TO_PORT(legacy_base.header.msgh_local_port);
+ kmsg->ikm_header->msgh_voucher_port = legacy_base.header.msgh_voucher_port;
+ kmsg->ikm_header->msgh_id = legacy_base.header.msgh_id;
+
+ DEBUG_KPRINT_SYSCALL_IPC("ipc_kmsg_get header:\n"
+ " size: 0x%.8x\n"
+ " bits: 0x%.8x\n"
+ " remote_port: %p\n"
+ " local_port: %p\n"
+ " voucher_port: 0x%.8x\n"
+ " id: %.8d\n",
+ kmsg->ikm_header->msgh_size,
+ kmsg->ikm_header->msgh_bits,
+ kmsg->ikm_header->msgh_remote_port,
+ kmsg->ikm_header->msgh_local_port,
+ kmsg->ikm_header->msgh_voucher_port,
+ kmsg->ikm_header->msgh_id);
+
+ if (copyinmsg(msg_addr, (char *)(kmsg->ikm_header + 1), size - (mach_msg_size_t)sizeof(mach_msg_header_t))) {
ipc_kmsg_free(kmsg);
return MACH_SEND_INVALID_DATA;
}
- kmsg->ikm_header->msgh_size = size;
+ /* unreachable if !DEBUG */
+ __unreachable_ok_push
+ if (DEBUG_KPRINT_SYSCALL_PREDICATE(DEBUG_KPRINT_SYSCALL_IPC_MASK)) {
+ kprintf("body: size: %lu\n", (size - sizeof(mach_msg_header_t)));
+ uint32_t i;
+ for (i = 0; i * 4 < (size - sizeof(mach_msg_header_t)); i++) {
+ kprintf("%.4x\n", ((uint32_t *)(kmsg->ikm_header + 1))[i]);
+ }
+ }
+ __unreachable_ok_pop
+ DEBUG_IPC_KMSG_PRINT(kmsg, "ipc_kmsg_get()");
- /*
+ /*
* I reserve for the trailer the largest space (MAX_TRAILER_SIZE)
* However, the internal size field of the trailer (msgh_trailer_size)
* is initialized to the minimum (sizeof(mach_msg_trailer_t)), to optimize
trailer->msgh_audit = current_thread()->task->audit_token;
trailer->msgh_trailer_type = MACH_MSG_TRAILER_FORMAT_0;
trailer->msgh_trailer_size = MACH_MSG_TRAILER_MINIMUM_SIZE;
-
+
#ifdef ppc
- if(trcWork.traceMask) dbgTrace(0x1100, (unsigned int)kmsg->ikm_header->msgh_id,
- (unsigned int)kmsg->ikm_header->msgh_remote_port,
- (unsigned int)kmsg->ikm_header->msgh_local_port, 0);
+ if (trcWork.traceMask) {
+ dbgTrace(0x1100, (unsigned int)kmsg->ikm_header->msgh_id,
+ (unsigned int)kmsg->ikm_header->msgh_remote_port,
+ (unsigned int)kmsg->ikm_header->msgh_local_port, 0);
+ }
#endif
+
+ trailer->msgh_labels.sender = 0;
*kmsgp = kmsg;
return MACH_MSG_SUCCESS;
}
mach_msg_return_t
ipc_kmsg_get_from_kernel(
- mach_msg_header_t *msg,
- mach_msg_size_t size,
- ipc_kmsg_t *kmsgp)
+ mach_msg_header_t *msg,
+ mach_msg_size_t size,
+ ipc_kmsg_t *kmsgp)
{
- ipc_kmsg_t kmsg;
- mach_msg_size_t msg_and_trailer_size;
+ ipc_kmsg_t kmsg;
+ mach_msg_size_t msg_and_trailer_size;
mach_msg_max_trailer_t *trailer;
- ipc_port_t dest_port;
+ ipc_port_t dest_port;
assert(size >= sizeof(mach_msg_header_t));
-// assert((size & 3) == 0);
+ assert((size & 3) == 0);
- assert(IP_VALID((ipc_port_t) msg->msgh_remote_port));
- dest_port = (ipc_port_t)msg->msgh_remote_port;
+ dest_port = msg->msgh_remote_port;
msg_and_trailer_size = size + MAX_TRAILER_SIZE;
* clients. These are set up for those kernel clients
* which cannot afford to wait.
*/
- if (IP_PREALLOC(dest_port)) {
+ if (IP_VALID(dest_port) && IP_PREALLOC(dest_port)) {
+ mach_msg_size_t max_desc = 0;
+
ip_lock(dest_port);
if (!ip_active(dest_port)) {
ip_unlock(dest_port);
}
assert(IP_PREALLOC(dest_port));
kmsg = dest_port->ip_premsg;
- if (msg_and_trailer_size > kmsg->ikm_size) {
- ip_unlock(dest_port);
- return MACH_SEND_TOO_LARGE;
- }
if (ikm_prealloc_inuse(kmsg)) {
ip_unlock(dest_port);
return MACH_SEND_NO_BUFFER;
}
+#if !defined(__LP64__)
+ if (msg->msgh_bits & MACH_MSGH_BITS_COMPLEX) {
+ assert(size > sizeof(mach_msg_base_t));
+ max_desc = ((mach_msg_base_t *)msg)->body.msgh_descriptor_count *
+ DESC_SIZE_ADJUSTMENT;
+ }
+#endif
+ if (msg_and_trailer_size > kmsg->ikm_size - max_desc) {
+ ip_unlock(dest_port);
+ return MACH_SEND_TOO_LARGE;
+ }
ikm_prealloc_set_inuse(kmsg, dest_port);
+ ikm_set_header(kmsg, msg_and_trailer_size);
ip_unlock(dest_port);
} else {
kmsg = ipc_kmsg_alloc(msg_and_trailer_size);
- if (kmsg == IKM_NULL)
+ if (kmsg == IKM_NULL) {
return MACH_SEND_NO_BUFFER;
+ }
}
(void) memcpy((void *) kmsg->ikm_header, (const void *) msg, size);
+ ikm_qos_init(kmsg);
+
kmsg->ikm_header->msgh_size = size;
- /*
+ /*
* I reserve for the trailer the largest space (MAX_TRAILER_SIZE)
* However, the internal size field of the trailer (msgh_trailer_size)
* is initialized to the minimum (sizeof(mach_msg_trailer_t)), to
* optimize the cases where no implicit data is requested.
*/
- trailer = (mach_msg_max_trailer_t *)
- ((vm_offset_t)kmsg->ikm_header + size);
+ trailer = (mach_msg_max_trailer_t *)
+ ((vm_offset_t)kmsg->ikm_header + size);
trailer->msgh_sender = KERNEL_SECURITY_TOKEN;
trailer->msgh_audit = KERNEL_AUDIT_TOKEN;
trailer->msgh_trailer_type = MACH_MSG_TRAILER_FORMAT_0;
trailer->msgh_trailer_size = MACH_MSG_TRAILER_MINIMUM_SIZE;
+ trailer->msgh_labels.sender = 0;
+
*kmsgp = kmsg;
return MACH_MSG_SUCCESS;
}
* MACH_MSG_SUCCESS The message was accepted.
* MACH_SEND_TIMED_OUT Caller still has message.
* MACH_SEND_INTERRUPTED Caller still has message.
+ * MACH_SEND_INVALID_DEST Caller still has message.
*/
mach_msg_return_t
ipc_kmsg_send(
- ipc_kmsg_t kmsg,
- mach_msg_option_t option,
- mach_msg_timeout_t send_timeout)
+ ipc_kmsg_t kmsg,
+ mach_msg_option_t option,
+ mach_msg_timeout_t send_timeout)
{
ipc_port_t port;
+ thread_t th = current_thread();
+ mach_msg_return_t error = MACH_MSG_SUCCESS;
+ boolean_t kernel_reply = FALSE;
+
+ /* Check if honor qlimit flag is set on thread. */
+ if ((th->options & TH_OPT_HONOR_QLIMIT) == TH_OPT_HONOR_QLIMIT) {
+ /* Remove the MACH_SEND_ALWAYS flag to honor queue limit. */
+ option &= (~MACH_SEND_ALWAYS);
+ /* Add the timeout flag since the message queue might be full. */
+ option |= MACH_SEND_TIMEOUT;
+ th->options &= (~TH_OPT_HONOR_QLIMIT);
+ }
- port = (ipc_port_t) kmsg->ikm_header->msgh_remote_port;
- assert(IP_VALID(port));
+#if IMPORTANCE_INHERITANCE
+ bool did_importance = false;
+#if IMPORTANCE_TRACE
+ mach_msg_id_t imp_msgh_id = -1;
+ int sender_pid = -1;
+#endif /* IMPORTANCE_TRACE */
+#endif /* IMPORTANCE_INHERITANCE */
+
+ /* don't allow the creation of a circular loop */
+ if (kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_CIRCULAR) {
+ ipc_kmsg_destroy(kmsg);
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO) | DBG_FUNC_END, MACH_MSGH_BITS_CIRCULAR);
+ return MACH_MSG_SUCCESS;
+ }
+
+ ipc_voucher_send_preprocessing(kmsg);
+ port = kmsg->ikm_header->msgh_remote_port;
+ assert(IP_VALID(port));
ip_lock(port);
- if (port->ip_receiver == ipc_space_kernel) {
+ /*
+ * If the destination has been guarded with a reply context, and the
+ * sender is consuming a send-once right, then assume this is a reply
+ * to an RPC and we need to validate that this sender is currently in
+ * the correct context.
+ */
+ if (enforce_strict_reply && port->ip_reply_context != 0 &&
+ ((option & MACH_SEND_KERNEL) == 0) &&
+ MACH_MSGH_BITS_REMOTE(kmsg->ikm_header->msgh_bits) == MACH_MSG_TYPE_PORT_SEND_ONCE) {
+ error = ipc_kmsg_validate_reply_context_locked(option, port, th->ith_voucher, th->ith_voucher_name);
+ if (error != MACH_MSG_SUCCESS) {
+ ip_unlock(port);
+ return error;
+ }
+ }
+
+#if IMPORTANCE_INHERITANCE
+retry:
+#endif /* IMPORTANCE_INHERITANCE */
+ /*
+ * Can't deliver to a dead port.
+ * However, we can pretend it got sent
+ * and was then immediately destroyed.
+ */
+ if (!ip_active(port)) {
+ ip_unlock(port);
+#if MACH_FLIPC
+ if (MACH_NODE_VALID(kmsg->ikm_node) && FPORT_VALID(port->ip_messages.imq_fport)) {
+ flipc_msg_ack(kmsg->ikm_node, &port->ip_messages, FALSE);
+ }
+#endif
+ if (did_importance) {
+ /*
+ * We're going to pretend we delivered this message
+ * successfully, and just eat the kmsg. However, the
+ * kmsg is actually visible via the importance_task!
+ * We need to cleanup this linkage before we destroy
+ * the message, and more importantly before we set the
+ * msgh_remote_port to NULL. See: 34302571
+ */
+ ipc_importance_clean(kmsg);
+ }
+ ip_release(port); /* JMM - Future: release right, not just ref */
+ kmsg->ikm_header->msgh_remote_port = MACH_PORT_NULL;
+ ipc_kmsg_destroy(kmsg);
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO) | DBG_FUNC_END, MACH_SEND_INVALID_DEST);
+ return MACH_MSG_SUCCESS;
+ }
+ if (port->ip_receiver == ipc_space_kernel) {
/*
* We can check ip_receiver == ipc_space_kernel
* before checking that the port is active because
* ipc_port_dealloc_kernel clears ip_receiver
* before destroying a kernel port.
*/
- assert(ip_active(port));
+ require_ip_active(port);
port->ip_messages.imq_seqno++;
ip_unlock(port);
/*
* Call the server routine, and get the reply message to send.
*/
- kmsg = ipc_kobject_server(kmsg);
- if (kmsg == IKM_NULL)
+ kmsg = ipc_kobject_server(kmsg, option);
+ if (kmsg == IKM_NULL) {
return MACH_MSG_SUCCESS;
+ }
- port = (ipc_port_t) kmsg->ikm_header->msgh_remote_port;
+ /* restart the KMSG_INFO tracing for the reply message */
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO) | DBG_FUNC_START);
+ port = kmsg->ikm_header->msgh_remote_port;
assert(IP_VALID(port));
ip_lock(port);
/* fall thru with reply - same options */
+ kernel_reply = TRUE;
+ if (!ip_active(port)) {
+ error = MACH_SEND_INVALID_DEST;
+ }
}
+#if IMPORTANCE_INHERITANCE
/*
- * Can't deliver to a dead port.
- * However, we can pretend it got sent
- * and was then immediately destroyed.
+ * Need to see if this message needs importance donation and/or
+ * propagation. That routine can drop the port lock temporarily.
+ * If it does we'll have to revalidate the destination.
*/
- if (!ip_active(port)) {
+ if (!did_importance) {
+ did_importance = true;
+ if (ipc_importance_send(kmsg, option)) {
+ goto retry;
+ }
+ }
+#endif /* IMPORTANCE_INHERITANCE */
+
+ if (error != MACH_MSG_SUCCESS) {
+ ip_unlock(port);
+ } else {
/*
- * We can't let ipc_kmsg_destroy deallocate
- * the port right, because we might end up
- * in an infinite loop trying to deliver
- * a send-once notification.
+ * We have a valid message and a valid reference on the port.
+ * we can unlock the port and call mqueue_send() on its message
+ * queue. Lock message queue while port is locked.
*/
+ imq_lock(&port->ip_messages);
+
+ ipc_special_reply_port_msg_sent(port);
+
+ ip_unlock(port);
+
+ error = ipc_mqueue_send(&port->ip_messages, kmsg, option,
+ send_timeout);
+ }
+
+#if IMPORTANCE_INHERITANCE
+ if (did_importance) {
+ __unused int importance_cleared = 0;
+ switch (error) {
+ case MACH_SEND_TIMED_OUT:
+ case MACH_SEND_NO_BUFFER:
+ case MACH_SEND_INTERRUPTED:
+ case MACH_SEND_INVALID_DEST:
+ /*
+ * We still have the kmsg and its
+ * reference on the port. But we
+ * have to back out the importance
+ * boost.
+ *
+ * The port could have changed hands,
+ * be inflight to another destination,
+ * etc... But in those cases our
+ * back-out will find the new owner
+ * (and all the operations that
+ * transferred the right should have
+ * applied their own boost adjustments
+ * to the old owner(s)).
+ */
+ importance_cleared = 1;
+ ipc_importance_clean(kmsg);
+ break;
+
+ case MACH_MSG_SUCCESS:
+ default:
+ break;
+ }
+#if IMPORTANCE_TRACE
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, (IMPORTANCE_CODE(IMP_MSG, IMP_MSG_SEND)) | DBG_FUNC_END,
+ task_pid(current_task()), sender_pid, imp_msgh_id, importance_cleared, 0);
+#endif /* IMPORTANCE_TRACE */
+ }
+#endif /* IMPORTANCE_INHERITANCE */
+
+ /*
+ * If the port has been destroyed while we wait, treat the message
+ * as a successful delivery (like we do for an inactive port).
+ */
+ if (error == MACH_SEND_INVALID_DEST) {
+#if MACH_FLIPC
+ if (MACH_NODE_VALID(kmsg->ikm_node) && FPORT_VALID(port->ip_messages.imq_fport)) {
+ flipc_msg_ack(kmsg->ikm_node, &port->ip_messages, FALSE);
+ }
+#endif
+ ip_release(port); /* JMM - Future: release right, not just ref */
+ kmsg->ikm_header->msgh_remote_port = MACH_PORT_NULL;
+ ipc_kmsg_destroy(kmsg);
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO) | DBG_FUNC_END, MACH_SEND_INVALID_DEST);
+ return MACH_MSG_SUCCESS;
+ }
- ip_release(port);
- ip_check_unlock(port);
+ if (error != MACH_MSG_SUCCESS && kernel_reply) {
+ /*
+ * Kernel reply messages that fail can't be allowed to
+ * pseudo-receive on error conditions. We need to just treat
+ * the message as a successful delivery.
+ */
+#if MACH_FLIPC
+ if (MACH_NODE_VALID(kmsg->ikm_node) && FPORT_VALID(port->ip_messages.imq_fport)) {
+ flipc_msg_ack(kmsg->ikm_node, &port->ip_messages, FALSE);
+ }
+#endif
+ ip_release(port); /* JMM - Future: release right, not just ref */
kmsg->ikm_header->msgh_remote_port = MACH_PORT_NULL;
ipc_kmsg_destroy(kmsg);
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_INFO) | DBG_FUNC_END, error);
return MACH_MSG_SUCCESS;
}
+ return error;
+}
+
+/*
+ * Routine: ipc_kmsg_put
+ * Purpose:
+ * Copies a message buffer to a user message.
+ * Copies only the specified number of bytes.
+ * Frees the message buffer.
+ * Conditions:
+ * Nothing locked. The message buffer must have clean
+ * header fields.
+ * Returns:
+ * MACH_MSG_SUCCESS Copied data out of message buffer.
+ * MACH_RCV_INVALID_DATA Couldn't copy to user message.
+ */
+
+mach_msg_return_t
+ipc_kmsg_put(
+ ipc_kmsg_t kmsg,
+ mach_msg_option_t option,
+ mach_vm_address_t rcv_addr,
+ mach_msg_size_t rcv_size,
+ mach_msg_size_t trailer_size,
+ mach_msg_size_t *sizep)
+{
+ mach_msg_size_t size = kmsg->ikm_header->msgh_size + trailer_size;
+ mach_msg_return_t mr;
+
+ DEBUG_IPC_KMSG_PRINT(kmsg, "ipc_kmsg_put()");
+
+
+ DEBUG_KPRINT_SYSCALL_IPC("ipc_kmsg_put header:\n"
+ " size: 0x%.8x\n"
+ " bits: 0x%.8x\n"
+ " remote_port: %p\n"
+ " local_port: %p\n"
+ " voucher_port: 0x%.8x\n"
+ " id: %.8d\n",
+ kmsg->ikm_header->msgh_size,
+ kmsg->ikm_header->msgh_bits,
+ kmsg->ikm_header->msgh_remote_port,
+ kmsg->ikm_header->msgh_local_port,
+ kmsg->ikm_header->msgh_voucher_port,
+ kmsg->ikm_header->msgh_id);
+
+#if defined(__LP64__)
+ if (current_task() != kernel_task) { /* don't if receiver expects fully-cooked in-kernel msg; */
+ mach_msg_legacy_header_t *legacy_header =
+ (mach_msg_legacy_header_t *)((vm_offset_t)(kmsg->ikm_header) + LEGACY_HEADER_SIZE_DELTA);
+
+ mach_msg_bits_t bits = kmsg->ikm_header->msgh_bits;
+ mach_msg_size_t msg_size = kmsg->ikm_header->msgh_size;
+ mach_port_name_t remote_port = CAST_MACH_PORT_TO_NAME(kmsg->ikm_header->msgh_remote_port);
+ mach_port_name_t local_port = CAST_MACH_PORT_TO_NAME(kmsg->ikm_header->msgh_local_port);
+ mach_port_name_t voucher_port = kmsg->ikm_header->msgh_voucher_port;
+ mach_msg_id_t id = kmsg->ikm_header->msgh_id;
+
+ legacy_header->msgh_id = id;
+ legacy_header->msgh_local_port = local_port;
+ legacy_header->msgh_remote_port = remote_port;
+ legacy_header->msgh_voucher_port = voucher_port;
+ legacy_header->msgh_size = msg_size - LEGACY_HEADER_SIZE_DELTA;
+ legacy_header->msgh_bits = bits;
+
+ size -= LEGACY_HEADER_SIZE_DELTA;
+ kmsg->ikm_header = (mach_msg_header_t *)legacy_header;
+ }
+#endif
+
+ /* unreachable if !DEBUG */
+ __unreachable_ok_push
+ if (DEBUG_KPRINT_SYSCALL_PREDICATE(DEBUG_KPRINT_SYSCALL_IPC_MASK)) {
+ kprintf("ipc_kmsg_put header+body: %d\n", (size));
+ uint32_t i;
+ for (i = 0; i * 4 < size; i++) {
+ kprintf("%.4x\n", ((uint32_t *)kmsg->ikm_header)[i]);
+ }
+ kprintf("type: %d\n", ((mach_msg_type_descriptor_t *)(((mach_msg_base_t *)kmsg->ikm_header) + 1))->type);
+ }
+ __unreachable_ok_pop
+
+ /* Re-Compute target address if using stack-style delivery */
+ if (option & MACH_RCV_STACK) {
+ rcv_addr += rcv_size - size;
+ }
+
+ if (copyoutmsg((const char *) kmsg->ikm_header, rcv_addr, size)) {
+ mr = MACH_RCV_INVALID_DATA;
+ size = 0;
+ } else {
+ mr = MACH_MSG_SUCCESS;
+ }
+
+ KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_KMSG_LINK) | DBG_FUNC_NONE,
+ (rcv_addr >= VM_MIN_KERNEL_AND_KEXT_ADDRESS ||
+ rcv_addr + size >= VM_MIN_KERNEL_AND_KEXT_ADDRESS) ? (uintptr_t)0 : (uintptr_t)rcv_addr,
+ VM_KERNEL_ADDRPERM((uintptr_t)kmsg),
+ 1 /* this is on the receive/copyout path */,
+ 0,
+ 0);
+ ipc_kmsg_free(kmsg);
+
+ if (sizep) {
+ *sizep = size;
+ }
+ return mr;
+}
+
+/*
+ * Routine: ipc_kmsg_put_to_kernel
+ * Purpose:
+ * Copies a message buffer to a kernel message.
+ * Frees the message buffer.
+ * No errors allowed.
+ * Conditions:
+ * Nothing locked.
+ */
+
+void
+ipc_kmsg_put_to_kernel(
+ mach_msg_header_t *msg,
+ ipc_kmsg_t kmsg,
+ mach_msg_size_t size)
+{
+ (void) memcpy((void *) msg, (const void *) kmsg->ikm_header, size);
+
+ ipc_kmsg_free(kmsg);
+}
+
+static mach_msg_priority_t
+ipc_get_current_thread_priority(void)
+{
+ thread_t thread = current_thread();
+ thread_qos_t qos;
+ int relpri;
+
+ qos = thread_get_requested_qos(thread, &relpri);
+ if (!qos) {
+ qos = thread_user_promotion_qos_for_pri(thread->base_pri);
+ relpri = 0;
+ }
+ return (mach_msg_priority_t)_pthread_priority_make_from_thread_qos(qos, relpri, 0);
+}
+
+static kern_return_t
+ipc_kmsg_set_qos(
+ ipc_kmsg_t kmsg,
+ mach_msg_option_t options,
+ mach_msg_priority_t override)
+{
+ kern_return_t kr;
+ ipc_port_t special_reply_port = kmsg->ikm_header->msgh_local_port;
+ ipc_port_t dest_port = kmsg->ikm_header->msgh_remote_port;
+
+ kr = ipc_get_pthpriority_from_kmsg_voucher(kmsg, &kmsg->ikm_qos);
+ if (kr != KERN_SUCCESS) {
+ if (options & MACH_SEND_PROPAGATE_QOS) {
+ kmsg->ikm_qos = ipc_get_current_thread_priority();
+ } else {
+ kmsg->ikm_qos = MACH_MSG_PRIORITY_UNSPECIFIED;
+ }
+ }
+ kmsg->ikm_qos_override = kmsg->ikm_qos;
+
+ if (options & MACH_SEND_OVERRIDE) {
+ pthread_priority_t pp = _pthread_priority_normalize_for_ipc(override);
+ if (pp > kmsg->ikm_qos) {
+ kmsg->ikm_qos_override = (mach_msg_priority_t)pp;
+ }
+ }
+
+ kr = KERN_SUCCESS;
+
+ if (IP_VALID(special_reply_port) &&
+ MACH_MSGH_BITS_LOCAL(kmsg->ikm_header->msgh_bits) == MACH_MSG_TYPE_PORT_SEND_ONCE) {
+ if ((options & MACH_SEND_SYNC_OVERRIDE)) {
+ boolean_t sync_bootstrap_checkin = !!(options & MACH_SEND_SYNC_BOOTSTRAP_CHECKIN);
+ /*
+ * Link the destination port to special reply port and make sure that
+ * dest port has a send turnstile, else allocate one.
+ */
+ ipc_port_link_special_reply_port(special_reply_port, dest_port, sync_bootstrap_checkin);
+ }
+ }
+ return kr;
+}
+
+static inline void
+ipc_kmsg_allow_immovable_send(
+ ipc_kmsg_t kmsg,
+ ipc_entry_t dest_entry)
+{
+ ipc_object_t object = dest_entry->ie_object;
+ /*
+ * If the dest port is a kobject, allow copyin of immovable send
+ * rights in the message body to succeed
+ */
+ if (IO_VALID(object) && io_is_kobject(object)) {
+ kmsg->ikm_flags |= IPC_KMSG_FLAGS_ALLOW_IMMOVABLE_SEND;
+ }
+}
+
+/*
+ * Routine: ipc_kmsg_link_reply_context_locked
+ * Purpose:
+ * Link any required context from the sending voucher
+ * to the reply port. The ipc_kmsg_copyin function will
+ * enforce that the sender calls mach_msg in this context.
+ * Conditions:
+ * reply port is locked
+ */
+static void
+ipc_kmsg_link_reply_context_locked(
+ ipc_port_t reply_port,
+ ipc_port_t voucher_port)
+{
+ kern_return_t __assert_only kr;
+ uint32_t persona_id = 0;
+ ipc_voucher_t voucher;
+
+ ip_lock_held(reply_port);
+
+ if (!ip_active(reply_port)) {
+ return;
+ }
+
+ voucher = convert_port_to_voucher(voucher_port);
+
+ kr = bank_get_bank_ledger_thread_group_and_persona(voucher, NULL, NULL, &persona_id);
+ assert(kr == KERN_SUCCESS);
+ ipc_voucher_release(voucher);
+
+ if (persona_id == 0 || persona_id == PERSONA_ID_NONE) {
+ /* there was no persona context to record */
+ return;
+ }
+
+ /*
+ * Set the persona_id as the context on the reply port.
+ * This will force the thread that replies to have adopted a voucher
+ * with a matching persona.
+ */
+ reply_port->ip_reply_context = persona_id;
+
+ return;
+}
+
+static kern_return_t
+ipc_kmsg_validate_reply_port_locked(ipc_port_t reply_port, mach_msg_option_t options)
+{
+ ip_lock_held(reply_port);
+
+ if (!ip_active(reply_port)) {
+ /*
+ * Ideally, we would enforce that the reply receive right is
+ * active, but asynchronous XPC cancellation destroys the
+ * receive right, so we just have to return success here.
+ */
+ return KERN_SUCCESS;
+ }
- if (kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_CIRCULAR) {
- ip_unlock(port);
+ if (options & MACH_SEND_MSG) {
+ /*
+ * If the rely port is active, then it should not be
+ * in-transit, and the receive right should be in the caller's
+ * IPC space.
+ */
+ if (!reply_port->ip_receiver_name || reply_port->ip_receiver != current_task()->itk_space) {
+ return KERN_INVALID_CAPABILITY;
+ }
- /* don't allow the creation of a circular loop */
+ /*
+ * A port used as a reply port in an RPC should have exactly 1
+ * extant send-once right which we either just made or are
+ * moving as part of the IPC.
+ */
+ if (reply_port->ip_sorights != 1) {
+ return KERN_INVALID_CAPABILITY;
+ }
+ /*
+ * XPC uses an extra send-right to keep the name of the reply
+ * right around through cancellation. That makes it harder to
+ * enforce a particular semantic kere, so for now, we say that
+ * you can have a maximum of 1 send right (in addition to your
+ * send once right). In the future, it would be great to lock
+ * this down even further.
+ */
+ if (reply_port->ip_srights > 1) {
+ return KERN_INVALID_CAPABILITY;
+ }
- ipc_kmsg_destroy(kmsg);
- return MACH_MSG_SUCCESS;
+ /*
+ * The sender can also specify that the receive right should
+ * be immovable. Note that this check only applies to
+ * send-only operations. Combined send/receive or rcv-only
+ * operations can specify an immovable receive right by
+ * opt-ing into guarded descriptors (MACH_RCV_GUARDED_DESC)
+ * and using the MACH_MSG_STRICT_REPLY options flag.
+ */
+ if (MACH_SEND_REPLY_IS_IMMOVABLE(options)) {
+ if (!reply_port->ip_immovable_receive) {
+ return KERN_INVALID_CAPABILITY;
+ }
+ }
}
/*
- * We have a valid message and a valid reference on the port.
- * we can unlock the port and call mqueue_send() on it's message
- * queue.
+ * don't enforce this yet: need a better way of indicating the
+ * receiver wants this...
*/
- ip_unlock(port);
- return (ipc_mqueue_send(&port->ip_messages, kmsg, option, send_timeout));
+#if 0
+ if (MACH_RCV_WITH_IMMOVABLE_REPLY(options)) {
+ if (!reply_port->ip_immovable_receive) {
+ return KERN_INVALID_CAPABILITY;
+ }
+ }
+#endif /* 0 */
+
+ return KERN_SUCCESS;
}
/*
- * Routine: ipc_kmsg_put
+ * Routine: ipc_kmsg_validate_reply_context_locked
* Purpose:
- * Copies a message buffer to a user message.
- * Copies only the specified number of bytes.
- * Frees the message buffer.
+ * Validate that the current thread is running in the context
+ * required by the destination port.
* Conditions:
- * Nothing locked. The message buffer must have clean
- * header fields.
+ * dest_port is locked
* Returns:
- * MACH_MSG_SUCCESS Copied data out of message buffer.
- * MACH_RCV_INVALID_DATA Couldn't copy to user message.
+ * MACH_MSG_SUCCESS on success.
+ * On error, an EXC_GUARD exception is also raised.
+ * This function *always* resets the port reply context.
*/
-
-mach_msg_return_t
-ipc_kmsg_put(
- mach_vm_address_t msg_addr,
- ipc_kmsg_t kmsg,
- mach_msg_size_t size)
+static mach_msg_return_t
+ipc_kmsg_validate_reply_context_locked(
+ mach_msg_option_t option,
+ ipc_port_t dest_port,
+ ipc_voucher_t voucher,
+ mach_port_name_t voucher_name)
{
- mach_msg_return_t mr;
+ uint32_t dest_ctx = dest_port->ip_reply_context;
+ dest_port->ip_reply_context = 0;
- if (copyoutmsg((const char *) kmsg->ikm_header, msg_addr, size))
- mr = MACH_RCV_INVALID_DATA;
- else
- mr = MACH_MSG_SUCCESS;
+ if (!ip_active(dest_port)) {
+ return MACH_MSG_SUCCESS;
+ }
- ipc_kmsg_free(kmsg);
- return mr;
-}
+ if (voucher == IPC_VOUCHER_NULL || !MACH_PORT_VALID(voucher_name)) {
+ if ((option & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(voucher_name, 0,
+ (MPG_FLAGS_STRICT_REPLY_INVALID_VOUCHER | dest_ctx),
+ kGUARD_EXC_STRICT_REPLY);
+ }
+ return MACH_SEND_INVALID_CONTEXT;
+ }
-/*
- * Routine: ipc_kmsg_put_to_kernel
- * Purpose:
- * Copies a message buffer to a kernel message.
- * Frees the message buffer.
- * No errors allowed.
- * Conditions:
- * Nothing locked.
- */
+ kern_return_t __assert_only kr;
+ uint32_t persona_id = 0;
+ kr = bank_get_bank_ledger_thread_group_and_persona(voucher, NULL, NULL, &persona_id);
+ assert(kr == KERN_SUCCESS);
-void
-ipc_kmsg_put_to_kernel(
- mach_msg_header_t *msg,
- ipc_kmsg_t kmsg,
- mach_msg_size_t size)
-{
- (void) memcpy((void *) msg, (const void *) kmsg->ikm_header, size);
+ if (dest_ctx != persona_id) {
+ if ((option & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(voucher_name, 0,
+ (MPG_FLAGS_STRICT_REPLY_MISMATCHED_PERSONA | ((((uint64_t)persona_id << 32) & MPG_FLAGS_STRICT_REPLY_MASK) | dest_ctx)),
+ kGUARD_EXC_STRICT_REPLY);
+ }
+ return MACH_SEND_INVALID_CONTEXT;
+ }
- ipc_kmsg_free(kmsg);
+ return MACH_MSG_SUCCESS;
}
/*
* and the bits field is updated. The destination port
* will be a valid port pointer.
*
- * The notify argument implements the MACH_SEND_CANCEL option.
- * If it is not MACH_PORT_NULL, it should name a receive right.
- * If the processing of the destination port would generate
- * a port-deleted notification (because the right for the
- * destination port is destroyed and it had a request for
- * a dead-name notification registered), and the port-deleted
- * notification would be sent to the named receive right,
- * then it isn't sent and the send-once right for the notify
- * port is quietly destroyed.
- *
* Conditions:
* Nothing locked.
* Returns:
* MACH_SEND_INVALID_HEADER
* Illegal value in the message header bits.
* MACH_SEND_INVALID_DEST The space is dead.
- * MACH_SEND_INVALID_NOTIFY
- * Notify is non-null and doesn't name a receive right.
- * (Either KERN_INVALID_NAME or KERN_INVALID_RIGHT.)
* MACH_SEND_INVALID_DEST Can't copyin destination port.
* (Either KERN_INVALID_NAME or KERN_INVALID_RIGHT.)
* MACH_SEND_INVALID_REPLY Can't copyin reply port.
mach_msg_return_t
ipc_kmsg_copyin_header(
- mach_msg_header_t *msg,
- ipc_space_t space,
- mach_port_name_t notify)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ mach_msg_priority_t override,
+ mach_msg_option_t *optionp)
{
+ mach_msg_header_t *msg = kmsg->ikm_header;
mach_msg_bits_t mbits = msg->msgh_bits & MACH_MSGH_BITS_USER;
- mach_port_name_t dest_name = (mach_port_name_t)msg->msgh_remote_port;
- mach_port_name_t reply_name = (mach_port_name_t)msg->msgh_local_port;
+ mach_port_name_t dest_name = CAST_MACH_PORT_TO_NAME(msg->msgh_remote_port);
+ mach_port_name_t reply_name = CAST_MACH_PORT_TO_NAME(msg->msgh_local_port);
+ mach_port_name_t voucher_name = MACH_PORT_NULL;
kern_return_t kr;
mach_msg_type_name_t dest_type = MACH_MSGH_BITS_REMOTE(mbits);
mach_msg_type_name_t reply_type = MACH_MSGH_BITS_LOCAL(mbits);
- ipc_object_t dest_port, reply_port;
- ipc_port_t dest_soright, reply_soright;
- ipc_port_t notify_port;
+ mach_msg_type_name_t voucher_type = MACH_MSGH_BITS_VOUCHER(mbits);
+ ipc_object_t dest_port = IO_NULL;
+ ipc_object_t reply_port = IO_NULL;
+ ipc_port_t dest_soright = IP_NULL;
+ ipc_port_t reply_soright = IP_NULL;
+ ipc_port_t voucher_soright = IP_NULL;
+ ipc_port_t release_port = IP_NULL;
+ ipc_port_t voucher_port = IP_NULL;
+ ipc_port_t voucher_release_port = IP_NULL;
+ ipc_entry_t dest_entry = IE_NULL;
+ ipc_entry_t reply_entry = IE_NULL;
+ ipc_entry_t voucher_entry = IE_NULL;
+
+ int assertcnt = 0;
+#if IMPORTANCE_INHERITANCE
+ boolean_t needboost = FALSE;
+#endif /* IMPORTANCE_INHERITANCE */
if ((mbits != msg->msgh_bits) ||
(!MACH_MSG_TYPE_PORT_ANY_SEND(dest_type)) ||
((reply_type == 0) ?
- (reply_name != MACH_PORT_NULL) :
- !MACH_MSG_TYPE_PORT_ANY_SEND(reply_type)))
+ (reply_name != MACH_PORT_NULL) :
+ !MACH_MSG_TYPE_PORT_ANY_SEND(reply_type))) {
return MACH_SEND_INVALID_HEADER;
+ }
- reply_soright = IP_NULL; /* in case we go to invalid dest early */
+ if (!MACH_PORT_VALID(dest_name)) {
+ return MACH_SEND_INVALID_DEST;
+ }
is_write_lock(space);
- if (!space->is_active)
- goto invalid_dest;
-
- if (!MACH_PORT_VALID(dest_name))
- goto invalid_dest;
+ if (!is_active(space)) {
+ is_write_unlock(space);
+ return MACH_SEND_INVALID_DEST;
+ }
+ /* space locked and active */
- if (notify != MACH_PORT_NULL) {
- ipc_entry_t entry;
+ /*
+ * If there is a voucher specified, make sure the disposition is
+ * valid and the entry actually refers to a voucher port. Don't
+ * actually copy in until we validate destination and reply.
+ */
+ if (voucher_type != MACH_MSGH_BITS_ZERO) {
+ voucher_name = msg->msgh_voucher_port;
- if ((entry = ipc_entry_lookup(space, notify)) == IE_NULL) {
+ if (voucher_name == MACH_PORT_DEAD ||
+ (voucher_type != MACH_MSG_TYPE_MOVE_SEND &&
+ voucher_type != MACH_MSG_TYPE_COPY_SEND)) {
is_write_unlock(space);
- return MACH_SEND_INVALID_NOTIFY;
+ if ((*optionp & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(voucher_name, 0, 0, kGUARD_EXC_SEND_INVALID_VOUCHER);
+ }
+ return MACH_SEND_INVALID_VOUCHER;
}
- if((entry->ie_bits & MACH_PORT_TYPE_RECEIVE) == 0) {
- is_write_unlock(space);
- return MACH_SEND_INVALID_NOTIFY;
+
+ if (voucher_name != MACH_PORT_NULL) {
+ voucher_entry = ipc_entry_lookup(space, voucher_name);
+ if (voucher_entry == IE_NULL ||
+ (voucher_entry->ie_bits & MACH_PORT_TYPE_SEND) == 0 ||
+ io_kotype(voucher_entry->ie_object) != IKOT_VOUCHER) {
+ is_write_unlock(space);
+ if ((*optionp & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(voucher_name, 0, 0, kGUARD_EXC_SEND_INVALID_VOUCHER);
+ }
+ return MACH_SEND_INVALID_VOUCHER;
+ }
+ } else {
+ voucher_type = MACH_MSG_TYPE_MOVE_SEND;
}
+ }
- notify_port = (ipc_port_t) entry->ie_object;
- } else
- notify_port = IP_NULL;
+ if (enforce_strict_reply && MACH_SEND_WITH_STRICT_REPLY(*optionp) &&
+ (!MACH_PORT_VALID(reply_name) ||
+ ((reply_type != MACH_MSG_TYPE_MAKE_SEND_ONCE) && (reply_type != MACH_MSG_TYPE_MOVE_SEND_ONCE))
+ )) {
+ /*
+ * The caller cannot enforce a reply context with an invalid
+ * reply port name, or a non-send_once reply disposition.
+ */
+ is_write_unlock(space);
+ if ((*optionp & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(reply_name, 0,
+ (MPG_FLAGS_STRICT_REPLY_INVALID_REPLY_DISP | reply_type),
+ kGUARD_EXC_STRICT_REPLY);
+ }
+ return MACH_SEND_INVALID_REPLY;
+ }
- if (dest_name == reply_name) {
- ipc_entry_t entry;
- mach_port_name_t name = dest_name;
+ /*
+ * Handle combinations of validating destination and reply; along
+ * with copying in destination, reply, and voucher in an atomic way.
+ */
+ if (dest_name == voucher_name) {
/*
- * Destination and reply ports are the same!
- * This is a little tedious to make atomic, because
- * there are 25 combinations of dest_type/reply_type.
- * However, most are easy. If either is move-sonce,
- * then there must be an error. If either are
- * make-send or make-sonce, then we must be looking
- * at a receive right so the port can't die.
- * The hard cases are the combinations of
- * copy-send and make-send.
+ * If the destination name is the same as the voucher name,
+ * the voucher_entry must already be known. Either that or
+ * the destination name is MACH_PORT_NULL (i.e. invalid).
*/
-
- entry = ipc_entry_lookup(space, name);
- if (entry == IE_NULL)
+ dest_entry = voucher_entry;
+ if (dest_entry == IE_NULL) {
goto invalid_dest;
+ }
+ /* Check if dest port allows immovable send rights to be sent in the kmsg body */
+ ipc_kmsg_allow_immovable_send(kmsg, dest_entry);
- assert(reply_type != 0); /* because name not null */
-
- if (!ipc_right_copyin_check(space, name, entry, reply_type))
- goto invalid_reply;
+ /*
+ * Make sure a future copyin of the reply port will succeed.
+ * Once we start copying in the dest/voucher pair, we can't
+ * back out.
+ */
+ if (MACH_PORT_VALID(reply_name)) {
+ assert(reply_type != 0); /* because reply_name not null */
- if ((dest_type == MACH_MSG_TYPE_MOVE_SEND_ONCE) ||
- (reply_type == MACH_MSG_TYPE_MOVE_SEND_ONCE)) {
- /*
- * Why must there be an error? To get a valid
- * destination, this entry must name a live
- * port (not a dead name or dead port). However
- * a successful move-sonce will destroy a
- * live entry. Therefore the other copyin,
- * whatever it is, would fail. We've already
- * checked for reply port errors above,
- * so report a destination error.
- */
+ /* It is just WRONG if dest, voucher, and reply are all the same. */
+ if (voucher_name == reply_name) {
+ goto invalid_reply;
+ }
+ reply_entry = ipc_entry_lookup(space, reply_name);
+ if (reply_entry == IE_NULL) {
+ goto invalid_reply;
+ }
+ assert(dest_entry != reply_entry); /* names are not equal */
+ if (!ipc_right_copyin_check_reply(space, reply_name, reply_entry, reply_type)) {
+ goto invalid_reply;
+ }
+ }
+ /*
+ * Do the joint copyin of the dest disposition and
+ * voucher disposition from the one entry/port. We
+ * already validated that the voucher copyin would
+ * succeed (above). So, any failure in combining
+ * the copyins can be blamed on the destination.
+ */
+ kr = ipc_right_copyin_two(space, dest_name, dest_entry,
+ dest_type, voucher_type, &dest_port, &dest_soright,
+ &release_port);
+ if (kr != KERN_SUCCESS) {
+ assert(kr != KERN_INVALID_CAPABILITY);
goto invalid_dest;
- } else if ((dest_type == MACH_MSG_TYPE_MAKE_SEND) ||
- (dest_type == MACH_MSG_TYPE_MAKE_SEND_ONCE) ||
- (reply_type == MACH_MSG_TYPE_MAKE_SEND) ||
- (reply_type == MACH_MSG_TYPE_MAKE_SEND_ONCE)) {
- kr = ipc_right_copyin(space, name, entry,
- dest_type, FALSE,
- &dest_port, &dest_soright);
- if (kr != KERN_SUCCESS)
- goto invalid_dest;
-
- /*
- * Either dest or reply needs a receive right.
- * We know the receive right is there, because
- * of the copyin_check and copyin calls. Hence
- * the port is not in danger of dying. If dest
- * used the receive right, then the right needed
- * by reply (and verified by copyin_check) will
- * still be there.
- */
-
- assert(IO_VALID(dest_port));
- assert(entry->ie_bits & MACH_PORT_TYPE_RECEIVE);
- assert(dest_soright == IP_NULL);
+ }
+ voucher_port = ip_object_to_port(dest_port);
- kr = ipc_right_copyin(space, name, entry,
- reply_type, TRUE,
- &reply_port, &reply_soright);
+ /*
+ * could not have been one of these dispositions,
+ * validated the port was a true kernel voucher port above,
+ * AND was successfully able to copyin both dest and voucher.
+ */
+ assert(dest_type != MACH_MSG_TYPE_MAKE_SEND);
+ assert(dest_type != MACH_MSG_TYPE_MAKE_SEND_ONCE);
+ assert(dest_type != MACH_MSG_TYPE_MOVE_SEND_ONCE);
+ /*
+ * Perform the delayed reply right copyin (guaranteed success).
+ */
+ if (reply_entry != IE_NULL) {
+ kr = ipc_right_copyin(space, reply_name, reply_entry,
+ reply_type, IPC_RIGHT_COPYIN_FLAGS_DEADOK,
+ &reply_port, &reply_soright,
+ &release_port, &assertcnt, 0, NULL);
+ assert(assertcnt == 0);
assert(kr == KERN_SUCCESS);
- assert(reply_port == dest_port);
- assert(entry->ie_bits & MACH_PORT_TYPE_RECEIVE);
- assert(reply_soright == IP_NULL);
- } else if ((dest_type == MACH_MSG_TYPE_COPY_SEND) &&
- (reply_type == MACH_MSG_TYPE_COPY_SEND)) {
+ }
+ } else {
+ if (dest_name == reply_name) {
/*
- * To make this atomic, just do one copy-send,
- * and dup the send right we get out.
+ * Destination and reply ports are the same!
+ * This is very similar to the case where the
+ * destination and voucher ports were the same
+ * (except the reply port disposition is not
+ * previously validated).
*/
-
- kr = ipc_right_copyin(space, name, entry,
- dest_type, FALSE,
- &dest_port, &dest_soright);
- if (kr != KERN_SUCCESS)
+ dest_entry = ipc_entry_lookup(space, dest_name);
+ if (dest_entry == IE_NULL) {
goto invalid_dest;
+ }
+ ipc_kmsg_allow_immovable_send(kmsg, dest_entry);
- assert(entry->ie_bits & MACH_PORT_TYPE_SEND);
- assert(dest_soright == IP_NULL);
+ reply_entry = dest_entry;
+ assert(reply_type != 0); /* because name not null */
/*
- * It's OK if the port we got is dead now,
- * so reply_port is IP_DEAD, because the msg
- * won't go anywhere anyway.
+ * Pre-validate that the reply right can be copied in by itself
*/
+ if (!ipc_right_copyin_check_reply(space, reply_name, reply_entry, reply_type)) {
+ goto invalid_reply;
+ }
- reply_port = (ipc_object_t)
- ipc_port_copy_send((ipc_port_t) dest_port);
- reply_soright = IP_NULL;
- } else if ((dest_type == MACH_MSG_TYPE_MOVE_SEND) &&
- (reply_type == MACH_MSG_TYPE_MOVE_SEND)) {
/*
- * This is an easy case. Just use our
- * handy-dandy special-purpose copyin call
- * to get two send rights for the price of one.
+ * Do the joint copyin of the dest disposition and
+ * reply disposition from the one entry/port.
*/
-
- kr = ipc_right_copyin_two(space, name, entry,
- &dest_port, &dest_soright);
- if (kr != KERN_SUCCESS)
+ kr = ipc_right_copyin_two(space, dest_name, dest_entry,
+ dest_type, reply_type, &dest_port, &dest_soright,
+ &release_port);
+ if (kr == KERN_INVALID_CAPABILITY) {
+ goto invalid_reply;
+ } else if (kr != KERN_SUCCESS) {
goto invalid_dest;
-
- /* the entry might need to be deallocated */
- if (IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE)
- ipc_entry_dealloc(space, name, entry);
-
+ }
reply_port = dest_port;
- reply_soright = IP_NULL;
} else {
- ipc_port_t soright;
-
- assert(((dest_type == MACH_MSG_TYPE_COPY_SEND) &&
- (reply_type == MACH_MSG_TYPE_MOVE_SEND)) ||
- ((dest_type == MACH_MSG_TYPE_MOVE_SEND) &&
- (reply_type == MACH_MSG_TYPE_COPY_SEND)));
-
/*
- * To make this atomic, just do a move-send,
- * and dup the send right we get out.
+ * Handle destination and reply independently, as
+ * they are independent entries (even if the entries
+ * refer to the same port).
+ *
+ * This can be the tough case to make atomic.
+ *
+ * The difficult problem is serializing with port death.
+ * The bad case is when dest_port dies after its copyin,
+ * reply_port dies before its copyin, and dest_port dies before
+ * reply_port. Then the copyins operated as if dest_port was
+ * alive and reply_port was dead, which shouldn't have happened
+ * because they died in the other order.
+ *
+ * Note that it is easy for a user task to tell if
+ * a copyin happened before or after a port died.
+ * If a port dies before copyin, a dead-name notification
+ * is generated and the dead name's urefs are incremented,
+ * and if the copyin happens first, a port-deleted
+ * notification is generated.
+ *
+ * Even so, avoiding that potentially detectable race is too
+ * expensive - and no known code cares about it. So, we just
+ * do the expedient thing and copy them in one after the other.
*/
- kr = ipc_right_copyin(space, name, entry,
- MACH_MSG_TYPE_MOVE_SEND, FALSE,
- &dest_port, &soright);
- if (kr != KERN_SUCCESS)
+ dest_entry = ipc_entry_lookup(space, dest_name);
+ if (dest_entry == IE_NULL) {
goto invalid_dest;
+ }
+ assert(dest_entry != voucher_entry);
+ ipc_kmsg_allow_immovable_send(kmsg, dest_entry);
+
+ /*
+ * Make sure reply port entry is valid before dest copyin.
+ */
+ if (MACH_PORT_VALID(reply_name)) {
+ if (reply_name == voucher_name) {
+ goto invalid_reply;
+ }
+ reply_entry = ipc_entry_lookup(space, reply_name);
+ if (reply_entry == IE_NULL) {
+ goto invalid_reply;
+ }
+ assert(dest_entry != reply_entry); /* names are not equal */
+ assert(reply_type != 0); /* because reply_name not null */
- /* the entry might need to be deallocated */
+ if (!ipc_right_copyin_check_reply(space, reply_name, reply_entry, reply_type)) {
+ goto invalid_reply;
+ }
+ }
- if (IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE)
- ipc_entry_dealloc(space, name, entry);
+ /*
+ * copyin the destination.
+ */
+ kr = ipc_right_copyin(space, dest_name, dest_entry,
+ dest_type, (IPC_RIGHT_COPYIN_FLAGS_ALLOW_IMMOVABLE_SEND |
+ IPC_RIGHT_COPYIN_FLAGS_ALLOW_DEAD_SEND_ONCE),
+ &dest_port, &dest_soright,
+ &release_port, &assertcnt, 0, NULL);
+ assert(assertcnt == 0);
+ if (kr != KERN_SUCCESS) {
+ goto invalid_dest;
+ }
+ assert(IO_VALID(dest_port));
+ assert(!IP_VALID(release_port));
/*
- * It's OK if the port we got is dead now,
- * so reply_port is IP_DEAD, because the msg
- * won't go anywhere anyway.
+ * Copyin the pre-validated reply right.
+ * It's OK if the reply right has gone dead in the meantime.
*/
+ if (MACH_PORT_VALID(reply_name)) {
+ kr = ipc_right_copyin(space, reply_name, reply_entry,
+ reply_type, IPC_RIGHT_COPYIN_FLAGS_DEADOK,
+ &reply_port, &reply_soright,
+ &release_port, &assertcnt, 0, NULL);
+ assert(assertcnt == 0);
+ assert(kr == KERN_SUCCESS);
+ } else {
+ /* convert invalid name to equivalent ipc_object type */
+ reply_port = ip_to_object(CAST_MACH_NAME_TO_PORT(reply_name));
+ }
+ }
+
+ /*
+ * Finally can copyin the voucher right now that dest and reply
+ * are fully copied in (guaranteed success).
+ */
+ if (IE_NULL != voucher_entry) {
+ kr = ipc_right_copyin(space, voucher_name, voucher_entry,
+ voucher_type, IPC_RIGHT_COPYIN_FLAGS_NONE,
+ (ipc_object_t *)&voucher_port,
+ &voucher_soright,
+ &voucher_release_port,
+ &assertcnt, 0, NULL);
+ assert(assertcnt == 0);
+ assert(KERN_SUCCESS == kr);
+ assert(IP_VALID(voucher_port));
+ require_ip_active(voucher_port);
+ }
+ }
- reply_port = (ipc_object_t)
- ipc_port_copy_send((ipc_port_t) dest_port);
+ /*
+ * The entries might need to be deallocated.
+ *
+ * Each entry should be deallocated only once,
+ * even if it was specified in more than one slot in the header.
+ * Note that dest can be the same entry as reply or voucher,
+ * but reply and voucher must be distinct entries.
+ */
+ assert(IE_NULL != dest_entry);
+ if (IE_NULL != reply_entry) {
+ assert(reply_entry != voucher_entry);
+ }
+
+ if (IE_BITS_TYPE(dest_entry->ie_bits) == MACH_PORT_TYPE_NONE) {
+ ipc_entry_dealloc(space, dest_name, dest_entry);
+
+ if (dest_entry == reply_entry) {
+ reply_entry = IE_NULL;
+ }
+
+ if (dest_entry == voucher_entry) {
+ voucher_entry = IE_NULL;
+ }
+
+ dest_entry = IE_NULL;
+ }
+ if (IE_NULL != reply_entry &&
+ IE_BITS_TYPE(reply_entry->ie_bits) == MACH_PORT_TYPE_NONE) {
+ ipc_entry_dealloc(space, reply_name, reply_entry);
+ reply_entry = IE_NULL;
+ }
+ if (IE_NULL != voucher_entry &&
+ IE_BITS_TYPE(voucher_entry->ie_bits) == MACH_PORT_TYPE_NONE) {
+ ipc_entry_dealloc(space, voucher_name, voucher_entry);
+ voucher_entry = IE_NULL;
+ }
+
+ dest_type = ipc_object_copyin_type(dest_type);
+ reply_type = ipc_object_copyin_type(reply_type);
- if (dest_type == MACH_MSG_TYPE_MOVE_SEND) {
- dest_soright = soright;
- reply_soright = IP_NULL;
+ /*
+ * JMM - Without rdar://problem/6275821, this is the last place we can
+ * re-arm the send-possible notifications. It may trigger unexpectedly
+ * early (send may NOT have failed), but better than missing. We assure
+ * we won't miss by forcing MACH_SEND_ALWAYS if we got past arming.
+ */
+ if (((*optionp & MACH_SEND_NOTIFY) != 0) &&
+ dest_type != MACH_MSG_TYPE_PORT_SEND_ONCE &&
+ dest_entry != IE_NULL && dest_entry->ie_request != IE_REQ_NONE) {
+ ipc_port_t dport = ip_object_to_port(dest_port);
+
+ assert(dport != IP_NULL);
+ ip_lock(dport);
+ if (ip_active(dport) && dport->ip_receiver != ipc_space_kernel) {
+ if (ip_full(dport)) {
+#if IMPORTANCE_INHERITANCE
+ needboost = ipc_port_request_sparm(dport, dest_name,
+ dest_entry->ie_request,
+ *optionp,
+ override);
+ if (needboost == FALSE) {
+ ip_unlock(dport);
+ }
+#else
+ ipc_port_request_sparm(dport, dest_name,
+ dest_entry->ie_request,
+ *optionp,
+ override);
+ ip_unlock(dport);
+#endif /* IMPORTANCE_INHERITANCE */
} else {
- dest_soright = IP_NULL;
- reply_soright = soright;
+ *optionp |= MACH_SEND_ALWAYS;
+ ip_unlock(dport);
}
+ } else {
+ ip_unlock(dport);
+ }
+ }
+
+ is_write_unlock(space);
+
+#if IMPORTANCE_INHERITANCE
+ /*
+ * If our request is the first boosting send-possible
+ * notification this cycle, push the boost down the
+ * destination port.
+ */
+ if (needboost == TRUE) {
+ ipc_port_t dport = ip_object_to_port(dest_port);
+
+ /* dport still locked from above */
+ if (ipc_port_importance_delta(dport, IPID_OPTION_SENDPOSSIBLE, 1) == FALSE) {
+ ip_unlock(dport);
}
- } else if (!MACH_PORT_VALID(reply_name)) {
- ipc_entry_t entry;
+ }
+#endif /* IMPORTANCE_INHERITANCE */
+
+ if (dest_soright != IP_NULL) {
+ ipc_notify_port_deleted(dest_soright, dest_name);
+ }
+ if (reply_soright != IP_NULL) {
+ ipc_notify_port_deleted(reply_soright, reply_name);
+ }
+ if (voucher_soright != IP_NULL) {
+ ipc_notify_port_deleted(voucher_soright, voucher_name);
+ }
+
+ /*
+ * No room to store voucher port in in-kernel msg header,
+ * so we store it back in the kmsg itself. Extract the
+ * qos, and apply any override before we enqueue the kmsg.
+ */
+ if (IP_VALID(voucher_port)) {
+ kmsg->ikm_voucher = voucher_port;
+ voucher_type = MACH_MSG_TYPE_MOVE_SEND;
+ }
+ msg->msgh_bits = MACH_MSGH_BITS_SET(dest_type, reply_type, voucher_type, mbits);
+ msg->msgh_remote_port = ip_object_to_port(dest_port);
+ msg->msgh_local_port = ip_object_to_port(reply_port);
+
+ /* capture the qos value(s) for the kmsg */
+ ipc_kmsg_set_qos(kmsg, *optionp, override);
+
+ if (release_port != IP_NULL) {
+ ip_release(release_port);
+ }
+
+ if (voucher_release_port != IP_NULL) {
+ ip_release(voucher_release_port);
+ }
+
+ if (enforce_strict_reply && MACH_SEND_WITH_STRICT_REPLY(*optionp) && IP_VALID(msg->msgh_local_port)) {
/*
- * No reply port! This is an easy case
- * to make atomic. Just copyin the destination.
+ * We've already validated that the reply disposition is a
+ * [make/move] send-once. Ideally, we should enforce that the
+ * reply port is also not dead, but XPC asynchronous
+ * cancellation can make the reply port dead before we
+ * actually make it to the mach_msg send.
+ *
+ * Here, we ensure that if we have a non-dead reply port, then
+ * the reply port's receive right should not be in-transit,
+ * and should live in the caller's IPC space.
*/
+ ipc_port_t rport = msg->msgh_local_port;
+ ip_lock(rport);
+ kr = ipc_kmsg_validate_reply_port_locked(rport, *optionp);
+ ip_unlock(rport);
+ if (kr != KERN_SUCCESS) {
+ /*
+ * no descriptors have been copied in yet, but the
+ * full header has been copied in: clean it up
+ */
+ ipc_kmsg_clean_partial(kmsg, 0, NULL, 0, 0);
+ if ((*optionp & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(reply_name, 0,
+ (MPG_FLAGS_STRICT_REPLY_INVALID_REPLY_PORT | kr),
+ kGUARD_EXC_STRICT_REPLY);
+ }
+ return MACH_SEND_INVALID_REPLY;
+ }
+ }
- entry = ipc_entry_lookup(space, dest_name);
- if (entry == IE_NULL)
- goto invalid_dest;
+ return MACH_MSG_SUCCESS;
- kr = ipc_right_copyin(space, dest_name, entry,
- dest_type, FALSE,
- &dest_port, &dest_soright);
- if (kr != KERN_SUCCESS)
- goto invalid_dest;
+invalid_reply:
+ is_write_unlock(space);
+
+ if (release_port != IP_NULL) {
+ ip_release(release_port);
+ }
+
+ assert(voucher_port == IP_NULL);
+ assert(voucher_soright == IP_NULL);
+
+ if ((*optionp & MACH_SEND_KERNEL) == 0) {
+ mach_port_guard_exception(reply_name, 0, 0, kGUARD_EXC_SEND_INVALID_REPLY);
+ }
+ return MACH_SEND_INVALID_REPLY;
+
+invalid_dest:
+ is_write_unlock(space);
+
+ if (release_port != IP_NULL) {
+ ip_release(release_port);
+ }
+
+ if (reply_soright != IP_NULL) {
+ ipc_notify_port_deleted(reply_soright, reply_name);
+ }
+
+ assert(voucher_port == IP_NULL);
+ assert(voucher_soright == IP_NULL);
+
+ return MACH_SEND_INVALID_DEST;
+}
+
+static mach_msg_descriptor_t *
+ipc_kmsg_copyin_port_descriptor(
+ volatile mach_msg_port_descriptor_t *dsc,
+ mach_msg_legacy_port_descriptor_t *user_dsc_in,
+ ipc_space_t space,
+ ipc_object_t dest,
+ ipc_kmsg_t kmsg,
+ mach_msg_option_t *optionp,
+ mach_msg_return_t *mr)
+{
+ volatile mach_msg_legacy_port_descriptor_t *user_dsc = user_dsc_in;
+ mach_msg_type_name_t user_disp;
+ mach_msg_type_name_t result_disp;
+ mach_port_name_t name;
+ ipc_object_t object;
+
+ user_disp = user_dsc->disposition;
+ result_disp = ipc_object_copyin_type(user_disp);
+
+ name = (mach_port_name_t)user_dsc->name;
+ if (MACH_PORT_VALID(name)) {
+ kern_return_t kr = ipc_object_copyin(space, name, user_disp, &object, 0, NULL, kmsg->ikm_flags);
+ if (kr != KERN_SUCCESS) {
+ if (((*optionp & MACH_SEND_KERNEL) == 0) && (kr == KERN_INVALID_RIGHT)) {
+ mach_port_guard_exception(name, 0, 0, kGUARD_EXC_SEND_INVALID_RIGHT);
+ }
+ *mr = MACH_SEND_INVALID_RIGHT;
+ return NULL;
+ }
+
+ if ((result_disp == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(dest))) {
+ kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
+ }
+ dsc->name = ip_object_to_port(object);
+ } else {
+ dsc->name = CAST_MACH_NAME_TO_PORT(name);
+ }
+ dsc->disposition = result_disp;
+ dsc->type = MACH_MSG_PORT_DESCRIPTOR;
- /* the entry might need to be deallocated */
+ dsc->pad_end = 0; // debug, unnecessary
- if (IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE)
- ipc_entry_dealloc(space, dest_name, entry);
+ return (mach_msg_descriptor_t *)(user_dsc_in + 1);
+}
- reply_port = (ipc_object_t) reply_name;
- reply_soright = IP_NULL;
+static mach_msg_descriptor_t *
+ipc_kmsg_copyin_ool_descriptor(
+ mach_msg_ool_descriptor_t *dsc,
+ mach_msg_descriptor_t *user_dsc,
+ int is_64bit,
+ vm_offset_t *paddr,
+ vm_map_copy_t *copy,
+ vm_size_t *space_needed,
+ vm_map_t map,
+ __unused mach_msg_option_t *optionp,
+ mach_msg_return_t *mr)
+{
+ vm_size_t length;
+ boolean_t dealloc;
+ mach_msg_copy_options_t copy_options;
+ mach_vm_offset_t addr;
+ mach_msg_descriptor_type_t dsc_type;
+
+ if (is_64bit) {
+ mach_msg_ool_descriptor64_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+
+ addr = (mach_vm_offset_t) user_ool_dsc->address;
+ length = user_ool_dsc->size;
+ dealloc = user_ool_dsc->deallocate;
+ copy_options = user_ool_dsc->copy;
+ dsc_type = user_ool_dsc->type;
+
+ user_dsc = (typeof(user_dsc))(user_ool_dsc + 1);
} else {
- ipc_entry_t dest_entry, reply_entry;
+ mach_msg_ool_descriptor32_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+
+ addr = CAST_USER_ADDR_T(user_ool_dsc->address);
+ dealloc = user_ool_dsc->deallocate;
+ copy_options = user_ool_dsc->copy;
+ dsc_type = user_ool_dsc->type;
+ length = user_ool_dsc->size;
+
+ user_dsc = (typeof(user_dsc))(user_ool_dsc + 1);
+ }
+
+ dsc->size = (mach_msg_size_t)length;
+ dsc->deallocate = dealloc;
+ dsc->copy = copy_options;
+ dsc->type = dsc_type;
+ if (length == 0) {
+ dsc->address = NULL;
+ } else if ((length >= MSG_OOL_SIZE_SMALL) &&
+ (copy_options == MACH_MSG_PHYSICAL_COPY) && !dealloc) {
/*
- * This is the tough case to make atomic.
- * The difficult problem is serializing with port death.
- * At the time we copyin dest_port, it must be alive.
- * If reply_port is alive when we copyin it, then
- * we are OK, because we serialize before the death
- * of both ports. Assume reply_port is dead at copyin.
- * Then if dest_port dies/died after reply_port died,
- * we are OK, because we serialize between the death
- * of the two ports. So the bad case is when dest_port
- * dies after its copyin, reply_port dies before its
- * copyin, and dest_port dies before reply_port. Then
- * the copyins operated as if dest_port was alive
- * and reply_port was dead, which shouldn't have happened
- * because they died in the other order.
- *
- * Note that it is easy for a user task to tell if
- * a copyin happened before or after a port died.
- * For example, suppose both dest and reply are
- * send-once rights (types are both move-sonce) and
- * both rights have dead-name requests registered.
- * If a port dies before copyin, a dead-name notification
- * is generated and the dead name's urefs are incremented,
- * and if the copyin happens first, a port-deleted
- * notification is generated.
- *
- * Note that although the entries are different,
- * dest_port and reply_port might still be the same.
+ * If the request is a physical copy and the source
+ * is not being deallocated, then allocate space
+ * in the kernel's pageable ipc copy map and copy
+ * the data in. The semantics guarantee that the
+ * data will have been physically copied before
+ * the send operation terminates. Thus if the data
+ * is not being deallocated, we must be prepared
+ * to page if the region is sufficiently large.
+ */
+ if (copyin(addr, (char *)*paddr, length)) {
+ *mr = MACH_SEND_INVALID_MEMORY;
+ return NULL;
+ }
+
+ /*
+ * The kernel ipc copy map is marked no_zero_fill.
+ * If the transfer is not a page multiple, we need
+ * to zero fill the balance.
+ */
+ if (!page_aligned(length)) {
+ (void) memset((void *) (*paddr + length), 0,
+ round_page(length) - length);
+ }
+ if (vm_map_copyin(ipc_kernel_copy_map, (vm_map_address_t)*paddr,
+ (vm_map_size_t)length, TRUE, copy) != KERN_SUCCESS) {
+ *mr = MACH_MSG_VM_KERNEL;
+ return NULL;
+ }
+ dsc->address = (void *)*copy;
+ *paddr += round_page(length);
+ *space_needed -= round_page(length);
+ } else {
+ /*
+ * Make a vm_map_copy_t of the of the data. If the
+ * data is small, this will do an optimized physical
+ * copy. Otherwise, it will do a virtual copy.
*
- * JMM - The code to handle this was too expensive and, anyway,
- * we intend to separate the dest lookup from the reply copyin
- * by a wide margin, so the user will have to learn to deal!
- * I will be making the change soon!
+ * NOTE: A virtual copy is OK if the original is being
+ * deallocted, even if a physical copy was requested.
*/
+ kern_return_t kr = vm_map_copyin(map, addr,
+ (vm_map_size_t)length, dealloc, copy);
+ if (kr != KERN_SUCCESS) {
+ *mr = (kr == KERN_RESOURCE_SHORTAGE) ?
+ MACH_MSG_VM_KERNEL :
+ MACH_SEND_INVALID_MEMORY;
+ return NULL;
+ }
+ dsc->address = (void *)*copy;
+ }
+ return user_dsc;
+}
- dest_entry = ipc_entry_lookup(space, dest_name);
- if (dest_entry == IE_NULL)
- goto invalid_dest;
+static mach_msg_descriptor_t *
+ipc_kmsg_copyin_ool_ports_descriptor(
+ mach_msg_ool_ports_descriptor_t *dsc,
+ mach_msg_descriptor_t *user_dsc,
+ int is_64bit,
+ vm_map_t map,
+ ipc_space_t space,
+ ipc_object_t dest,
+ ipc_kmsg_t kmsg,
+ mach_msg_option_t *optionp,
+ mach_msg_return_t *mr)
+{
+ void *data;
+ ipc_object_t *objects;
+ unsigned int i;
+ mach_vm_offset_t addr;
+ mach_msg_type_name_t user_disp;
+ mach_msg_type_name_t result_disp;
+ mach_msg_type_number_t count;
+ mach_msg_copy_options_t copy_option;
+ boolean_t deallocate;
+ mach_msg_descriptor_type_t type;
+ vm_size_t ports_length, names_length;
+
+ if (is_64bit) {
+ mach_msg_ool_ports_descriptor64_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+
+ addr = (mach_vm_offset_t)user_ool_dsc->address;
+ count = user_ool_dsc->count;
+ deallocate = user_ool_dsc->deallocate;
+ copy_option = user_ool_dsc->copy;
+ user_disp = user_ool_dsc->disposition;
+ type = user_ool_dsc->type;
+
+ user_dsc = (typeof(user_dsc))(user_ool_dsc + 1);
+ } else {
+ mach_msg_ool_ports_descriptor32_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+
+ addr = CAST_USER_ADDR_T(user_ool_dsc->address);
+ count = user_ool_dsc->count;
+ deallocate = user_ool_dsc->deallocate;
+ copy_option = user_ool_dsc->copy;
+ user_disp = user_ool_dsc->disposition;
+ type = user_ool_dsc->type;
+
+ user_dsc = (typeof(user_dsc))(user_ool_dsc + 1);
+ }
+
+ dsc->deallocate = deallocate;
+ dsc->copy = copy_option;
+ dsc->type = type;
+ dsc->count = count;
+ dsc->address = NULL; /* for now */
+
+ result_disp = ipc_object_copyin_type(user_disp);
+ dsc->disposition = result_disp;
- reply_entry = ipc_entry_lookup(space, reply_name);
- if (reply_entry == IE_NULL)
- goto invalid_reply;
+ /* We always do a 'physical copy', but you have to specify something valid */
+ if (copy_option != MACH_MSG_PHYSICAL_COPY &&
+ copy_option != MACH_MSG_VIRTUAL_COPY) {
+ *mr = MACH_SEND_INVALID_TYPE;
+ return NULL;
+ }
- assert(dest_entry != reply_entry); /* names are not equal */
- assert(reply_type != 0); /* because reply_name not null */
+ /* calculate length of data in bytes, rounding up */
- if (!ipc_right_copyin_check(space, reply_name, reply_entry,
- reply_type))
- goto invalid_reply;
+ if (os_mul_overflow(count, sizeof(mach_port_t), &ports_length)) {
+ *mr = MACH_SEND_TOO_LARGE;
+ return NULL;
+ }
- kr = ipc_right_copyin(space, dest_name, dest_entry,
- dest_type, FALSE,
- &dest_port, &dest_soright);
- if (kr != KERN_SUCCESS)
- goto invalid_dest;
+ if (os_mul_overflow(count, sizeof(mach_port_name_t), &names_length)) {
+ *mr = MACH_SEND_TOO_LARGE;
+ return NULL;
+ }
- assert(IO_VALID(dest_port));
+ if (ports_length == 0) {
+ return user_dsc;
+ }
- kr = ipc_right_copyin(space, reply_name, reply_entry,
- reply_type, TRUE,
- &reply_port, &reply_soright);
+ data = kalloc(ports_length);
- assert(kr == KERN_SUCCESS);
+ if (data == NULL) {
+ *mr = MACH_SEND_NO_BUFFER;
+ return NULL;
+ }
- /* the entries might need to be deallocated */
+#ifdef __LP64__
+ mach_port_name_t *names = &((mach_port_name_t *)data)[count];
+#else
+ mach_port_name_t *names = ((mach_port_name_t *)data);
+#endif
- if (IE_BITS_TYPE(reply_entry->ie_bits) == MACH_PORT_TYPE_NONE)
- ipc_entry_dealloc(space, reply_name, reply_entry);
+ if (copyinmap(map, addr, names, names_length) != KERN_SUCCESS) {
+ kfree(data, ports_length);
+ *mr = MACH_SEND_INVALID_MEMORY;
+ return NULL;
+ }
- if (IE_BITS_TYPE(dest_entry->ie_bits) == MACH_PORT_TYPE_NONE)
- ipc_entry_dealloc(space, dest_name, dest_entry);
+ if (deallocate) {
+ (void) mach_vm_deallocate(map, addr, (mach_vm_size_t)ports_length);
}
- /*
- * At this point, dest_port, reply_port,
- * dest_soright, reply_soright are all initialized.
- * Any defunct entries have been deallocated.
- * The space is still write-locked, and we need to
- * make the MACH_SEND_CANCEL check. The notify_port pointer
- * is still usable, because the copyin code above won't ever
- * deallocate a receive right, so its entry still exists
- * and holds a ref. Note notify_port might even equal
- * dest_port or reply_port.
- */
+ objects = (ipc_object_t *) data;
+ dsc->address = data;
- if ((notify != MACH_PORT_NULL) &&
- (dest_soright == notify_port)) {
- ipc_port_release_sonce(dest_soright);
- dest_soright = IP_NULL;
- }
+ for (i = 0; i < count; i++) {
+ mach_port_name_t name = names[i];
+ ipc_object_t object;
- is_write_unlock(space);
+ if (!MACH_PORT_VALID(name)) {
+ objects[i] = ip_to_object(CAST_MACH_NAME_TO_PORT(name));
+ continue;
+ }
- if (dest_soright != IP_NULL)
- ipc_notify_port_deleted(dest_soright, dest_name);
+ kern_return_t kr = ipc_object_copyin(space, name, user_disp, &object, 0, NULL, kmsg->ikm_flags);
- if (reply_soright != IP_NULL)
- ipc_notify_port_deleted(reply_soright, reply_name);
+ if (kr != KERN_SUCCESS) {
+ unsigned int j;
- dest_type = ipc_object_copyin_type(dest_type);
- reply_type = ipc_object_copyin_type(reply_type);
+ for (j = 0; j < i; j++) {
+ object = objects[j];
+ if (IPC_OBJECT_VALID(object)) {
+ ipc_object_destroy(object, result_disp);
+ }
+ }
+ kfree(data, ports_length);
+ dsc->address = NULL;
+ if (((*optionp & MACH_SEND_KERNEL) == 0) && (kr == KERN_INVALID_RIGHT)) {
+ mach_port_guard_exception(name, 0, 0, kGUARD_EXC_SEND_INVALID_RIGHT);
+ }
+ *mr = MACH_SEND_INVALID_RIGHT;
+ return NULL;
+ }
- msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
- MACH_MSGH_BITS(dest_type, reply_type));
- msg->msgh_remote_port = (ipc_port_t)dest_port;
- msg->msgh_local_port = (ipc_port_t)reply_port;
+ if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(dest))) {
+ kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
+ }
- return MACH_MSG_SUCCESS;
+ objects[i] = object;
+ }
-invalid_reply:
- is_write_unlock(space);
- return MACH_SEND_INVALID_REPLY;
+ return user_dsc;
+}
-invalid_dest:
- is_write_unlock(space);
- if (reply_soright != IP_NULL)
- ipc_notify_port_deleted(reply_soright, reply_name);
- return MACH_SEND_INVALID_DEST;
+static mach_msg_descriptor_t *
+ipc_kmsg_copyin_guarded_port_descriptor(
+ mach_msg_guarded_port_descriptor_t *dsc,
+ mach_msg_descriptor_t *user_addr,
+ int is_64bit,
+ ipc_space_t space,
+ ipc_object_t dest,
+ ipc_kmsg_t kmsg,
+ mach_msg_option_t *optionp,
+ mach_msg_return_t *mr)
+{
+ mach_msg_descriptor_t *user_dsc;
+ mach_msg_type_name_t disp;
+ mach_msg_type_name_t result_disp;
+ mach_port_name_t name;
+ mach_msg_guard_flags_t guard_flags;
+ ipc_object_t object;
+ mach_port_context_t context;
+
+ if (!is_64bit) {
+ mach_msg_guarded_port_descriptor32_t *user_gp_dsc = (typeof(user_gp_dsc))user_addr;
+ name = user_gp_dsc->name;
+ guard_flags = user_gp_dsc->flags;
+ disp = user_gp_dsc->disposition;
+ context = user_gp_dsc->context;
+ user_dsc = (mach_msg_descriptor_t *)(user_gp_dsc + 1);
+ } else {
+ mach_msg_guarded_port_descriptor64_t *user_gp_dsc = (typeof(user_gp_dsc))user_addr;
+ name = user_gp_dsc->name;
+ guard_flags = user_gp_dsc->flags;
+ disp = user_gp_dsc->disposition;
+ context = user_gp_dsc->context;
+ user_dsc = (mach_msg_descriptor_t *)(user_gp_dsc + 1);
+ }
+
+ guard_flags &= MACH_MSG_GUARD_FLAGS_MASK;
+ result_disp = ipc_object_copyin_type(disp);
+
+ if (MACH_PORT_VALID(name)) {
+ kern_return_t kr = ipc_object_copyin(space, name, disp, &object, context, &guard_flags, kmsg->ikm_flags);
+ if (kr != KERN_SUCCESS) {
+ if (((*optionp & MACH_SEND_KERNEL) == 0) && (kr == KERN_INVALID_RIGHT)) {
+ mach_port_guard_exception(name, 0, 0, kGUARD_EXC_SEND_INVALID_RIGHT);
+ }
+ *mr = MACH_SEND_INVALID_RIGHT;
+ return NULL;
+ }
+
+ if ((result_disp == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(dest))) {
+ kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
+ }
+ dsc->name = ip_object_to_port(object);
+ } else {
+ dsc->name = CAST_MACH_NAME_TO_PORT(name);
+ }
+ dsc->flags = guard_flags;
+ dsc->disposition = result_disp;
+ dsc->type = MACH_MSG_GUARDED_PORT_DESCRIPTOR;
+
+#if __LP64__
+ dsc->pad_end = 0; // debug, unnecessary
+#endif
+ return user_dsc;
}
+
/*
* Routine: ipc_kmsg_copyin_body
* Purpose:
* MACH_SEND_MSG_TOO_SMALL Body is too small for types/data.
* MACH_SEND_INVALID_RT_OOL_SIZE OOL Buffer too large for RT
* MACH_MSG_INVALID_RT_DESCRIPTOR Dealloc and RT are incompatible
+ * MACH_SEND_NO_GRANT_DEST Dest port doesn't accept ports in body
*/
-#define DESC_COUNT_SMALL 64
-
mach_msg_return_t
ipc_kmsg_copyin_body(
- ipc_kmsg_t kmsg,
- ipc_space_t space,
- vm_map_t map)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ vm_map_t map,
+ mach_msg_option_t *optionp)
{
- ipc_object_t dest;
- mach_msg_body_t *body;
- mach_msg_descriptor_t *daddr, *naddr;
- mach_msg_type_number_t dsc_count;
- boolean_t differs = MAP_SIZE_DIFFERS(map);
- boolean_t complex = FALSE;
- vm_size_t space_needed = 0;
- vm_size_t desc_size_space[DESC_COUNT_SMALL];
- vm_size_t *user_desc_sizes = NULL;
- vm_offset_t paddr = 0;
- vm_map_copy_t copy = VM_MAP_COPY_NULL;
- kern_return_t kr;
- mach_msg_type_number_t i;
- mach_msg_return_t mr = MACH_MSG_SUCCESS;
-
- /*
- * Determine if the target is a kernel port.
- */
- dest = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
- body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
- naddr = (mach_msg_descriptor_t *) (body + 1);
-
- dsc_count = body->msgh_descriptor_count;
- if (dsc_count == 0)
- return MACH_MSG_SUCCESS;
+ ipc_object_t dest;
+ mach_msg_body_t *body;
+ mach_msg_descriptor_t *daddr, *naddr, *end;
+ mach_msg_descriptor_t *user_addr, *kern_addr;
+ mach_msg_type_number_t dsc_count;
+ boolean_t is_task_64bit = (map->max_offset > VM_MAX_ADDRESS);
+ boolean_t complex = FALSE;
+ boolean_t contains_port_desc = FALSE;
+ vm_size_t space_needed = 0;
+ vm_offset_t paddr = 0;
+ vm_map_copy_t copy = VM_MAP_COPY_NULL;
+ mach_msg_type_number_t i;
+ mach_msg_return_t mr = MACH_MSG_SUCCESS;
+ ipc_port_t remote_port = kmsg->ikm_header->msgh_remote_port;
+
+ vm_size_t descriptor_size = 0;
+
+ mach_msg_type_number_t total_ool_port_count = 0;
+ mach_msg_guard_flags_t guard_flags = 0;
+ mach_port_context_t context;
+ mach_msg_type_name_t disp;
- if (differs) {
- user_desc_sizes = (dsc_count <= DESC_COUNT_SMALL) ?
- &desc_size_space : kalloc(dsc_count * sizeof(vm_size_t));
- if (user_desc_sizes == NULL) {
- ipc_kmsg_clean_partial(kmsg,0,0,0,0);
- return KERN_RESOURCE_SHORTAGE;
- }
- }
-
- /*
- * Make an initial pass to determine kernal VM space requirements for
- * physical copies and possible contraction of the descriptors from
- * processes with pointers larger than the kernel's.
- */
- daddr = 0;
- for (i = 0; i < dsc_count; i++) {
- daddr = naddr;
-
- /* make sure the descriptor fits in the message */
- if (differs) {
- switch (daddr->type.type) {
- case MACH_MSG_OOL_DESCRIPTOR:
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_PORTS_DESCRIPTOR:
- user_desc_sizes[i] = sizeof(OTHER_OOL_DESCRIPTOR);
- break;
- default:
- user_desc_sizes[i] = sizeof(*daddr);
- break;
- }
- naddr = (mach_msg_descriptor_t *)
- ((vm_offset_t)daddr + user_desc_sizes[i]);
- } else {
- naddr = daddr + 1;
- }
+ /*
+ * Determine if the target is a kernel port.
+ */
+ dest = ip_to_object(remote_port);
+ body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
+ naddr = (mach_msg_descriptor_t *) (body + 1);
+ end = (mach_msg_descriptor_t *) ((vm_offset_t)kmsg->ikm_header + kmsg->ikm_header->msgh_size);
- if (naddr > (mach_msg_descriptor_t *)
- ((vm_offset_t)kmsg->ikm_header + kmsg->ikm_header->msgh_size)) {
- ipc_kmsg_clean_partial(kmsg,0,0,0,0);
- mr = MACH_SEND_MSG_TOO_SMALL;
- goto out;
+ dsc_count = body->msgh_descriptor_count;
+ if (dsc_count == 0) {
+ return MACH_MSG_SUCCESS;
}
- switch (daddr->type.type) {
- mach_msg_size_t size;
-
- case MACH_MSG_OOL_DESCRIPTOR:
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- size = (differs) ?
- ((OTHER_OOL_DESCRIPTOR *)daddr)->size :
- daddr->out_of_line.size;
-
- if (daddr->out_of_line.copy != MACH_MSG_PHYSICAL_COPY &&
- daddr->out_of_line.copy != MACH_MSG_VIRTUAL_COPY) {
- /*
- * Invalid copy option
- */
- ipc_kmsg_clean_partial(kmsg,0,0,0,0);
- mr = MACH_SEND_INVALID_TYPE;
- goto out;
- }
-
- if ((size >= MSG_OOL_SIZE_SMALL) &&
- (daddr->out_of_line.copy == MACH_MSG_PHYSICAL_COPY) &&
- !(daddr->out_of_line.deallocate)) {
-
- /*
- * Out-of-line memory descriptor, accumulate kernel
- * memory requirements
- */
- space_needed += round_page(size);
- if (space_needed > ipc_kmsg_max_vm_space) {
-
- /*
- * Per message kernel memory limit exceeded
- */
- ipc_kmsg_clean_partial(kmsg,0,0,0,0);
- mr = MACH_MSG_VM_KERNEL;
- goto out;
- }
- }
- }
- }
-
- /*
- * Allocate space in the pageable kernel ipc copy map for all the
- * ool data that is to be physically copied. Map is marked wait for
- * space.
- */
- if (space_needed) {
- if (vm_allocate(ipc_kernel_copy_map, &paddr, space_needed, VM_FLAGS_ANYWHERE) !=
- KERN_SUCCESS) {
- ipc_kmsg_clean_partial(kmsg,0,0,0,0);
- mr = MACH_MSG_VM_KERNEL;
- goto out;
- }
- }
-
- /*
- * handle the OOL regions and port descriptors.
- * We process them in reverse order starting with the last one
- * scanned above. That way, we can compact them up against
- * the message body (if the user-descriptor size is larger than
- * the kernel representation).
- */
- naddr -= 1;
- do {
-
- switch (daddr->type.type) {
-
- /* port descriptors are the same size everywhere, how nice */
- case MACH_MSG_PORT_DESCRIPTOR: {
- mach_msg_type_name_t user_disp;
- mach_msg_type_name_t result_disp;
- mach_port_name_t name;
- ipc_object_t object;
- volatile mach_msg_port_descriptor_t *dsc;
- volatile mach_msg_port_descriptor_t *user_dsc;
-
- user_dsc = &daddr->port;
- dsc = &naddr->port;
-
- user_disp = user_dsc->disposition;
- result_disp = ipc_object_copyin_type(user_disp);
-
- name = (mach_port_name_t)user_dsc->name;
- if (MACH_PORT_VALID(name)) {
-
- kr = ipc_object_copyin(space, name, user_disp, &object);
- if (kr != KERN_SUCCESS) {
- mr = MACH_SEND_INVALID_RIGHT;
- break;
- }
+ /*
+ * Make an initial pass to determine kernal VM space requirements for
+ * physical copies and possible contraction of the descriptors from
+ * processes with pointers larger than the kernel's.
+ */
+ daddr = NULL;
+ for (i = 0; i < dsc_count; i++) {
+ mach_msg_size_t size;
+ mach_msg_type_number_t ool_port_count = 0;
+
+ daddr = naddr;
+
+ /* make sure the descriptor fits in the message */
+ if (is_task_64bit) {
+ if ((mach_msg_descriptor_t*)((vm_offset_t)daddr + 12) > end) {
+ mr = MACH_SEND_MSG_TOO_SMALL;
+ goto clean_message;
+ }
- if ((result_disp == MACH_MSG_TYPE_PORT_RECEIVE) &&
- ipc_port_check_circularity((ipc_port_t) object,
- (ipc_port_t) dest)) {
- kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
- }
- dsc->name = (ipc_port_t) object;
+ switch (daddr->type.type) {
+ case MACH_MSG_OOL_DESCRIPTOR:
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR:
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ descriptor_size += 16;
+ naddr = (typeof(naddr))((vm_offset_t)daddr + 16);
+ break;
+ default:
+ descriptor_size += 12;
+ naddr = (typeof(naddr))((vm_offset_t)daddr + 12);
+ break;
+ }
} else {
- dsc->name = (mach_port_t)name;
+ descriptor_size += 12;
+ naddr = (typeof(naddr))((vm_offset_t)daddr + 12);
}
- dsc->disposition = result_disp;
- dsc->type = MACH_MSG_PORT_DESCRIPTOR;
- complex = TRUE;
- break;
- }
-
- /* out of line descriptors differ in size between 32 and 64 bit processes */
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_DESCRIPTOR: {
- vm_size_t length;
- boolean_t dealloc;
- mach_msg_copy_options_t copy_options;
- mach_vm_offset_t addr;
- mach_msg_descriptor_type_t dsc_type;
-
- volatile mach_msg_ool_descriptor_t *dsc;
-
- if (differs) {
- volatile OTHER_OOL_DESCRIPTOR *user_dsc;
-
- user_dsc = (OTHER_OOL_DESCRIPTOR *)&daddr->out_of_line;
- addr = (mach_vm_offset_t) user_dsc->address;
- length = user_dsc->size;
- dealloc = user_dsc->deallocate;
- copy_options = user_dsc->copy;
- dsc_type = user_dsc->type;
- } else {
- volatile mach_msg_ool_descriptor_t *user_dsc;
-
- user_dsc = &daddr->out_of_line;
- addr = CAST_USER_ADDR_T(user_dsc->address);
- dealloc = user_dsc->deallocate;
- copy_options = user_dsc->copy;
- dsc_type = user_dsc->type;
- length = user_dsc->size;
- }
-
- dsc = &naddr->out_of_line;
- dsc->size = length;
- dsc->deallocate = dealloc;
- dsc->copy = copy_options;
- dsc->type = dsc_type;
-
- if (length == 0) {
- dsc->address = 0;
- } else if ((length >= MSG_OOL_SIZE_SMALL) &&
- (copy_options == MACH_MSG_PHYSICAL_COPY) && !dealloc) {
-
- /*
- * If the request is a physical copy and the source
- * is not being deallocated, then allocate space
- * in the kernel's pageable ipc copy map and copy
- * the data in. The semantics guarantee that the
- * data will have been physically copied before
- * the send operation terminates. Thus if the data
- * is not being deallocated, we must be prepared
- * to page if the region is sufficiently large.
- */
- if (copyin(addr, (char *) paddr, length)) {
- mr = MACH_SEND_INVALID_MEMORY;
- break;
- }
- /*
- * The kernel ipc copy map is marked no_zero_fill.
- * If the transfer is not a page multiple, we need
- * to zero fill the balance.
- */
- if (!page_aligned(length)) {
- (void) memset((void *) (paddr + length), 0,
- round_page(length) - length);
- }
- if (vm_map_copyin(ipc_kernel_copy_map, (vm_map_address_t)paddr,
- (vm_map_size_t)length, TRUE, ©) != KERN_SUCCESS) {
- mr = MACH_MSG_VM_KERNEL;
- break;
- }
- dsc->address = (void *) copy;
- paddr += round_page(length);
- space_needed -= round_page(length);
- } else {
+ if (naddr > end) {
+ mr = MACH_SEND_MSG_TOO_SMALL;
+ goto clean_message;
+ }
- /*
- * Make a vm_map_copy_t of the of the data. If the
- * data is small, this will do an optimized physical
- * copy. Otherwise, it will do a virtual copy.
- *
- * NOTE: A virtual copy is OK if the original is being
- * deallocted, even if a physical copy was requested.
- */
- kr = vm_map_copyin(map, addr,
- (vm_map_size_t)length, dealloc, ©);
- if (kr != KERN_SUCCESS) {
- mr = (kr == KERN_RESOURCE_SHORTAGE) ?
- MACH_MSG_VM_KERNEL :
- MACH_SEND_INVALID_MEMORY;
- break;
- }
- dsc->address = (void *) copy;
- }
- complex = TRUE;
- break;
- }
- case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
- vm_size_t length;
- void *data;
- ipc_object_t *objects;
- unsigned int j;
- mach_vm_offset_t addr;
- mach_msg_type_name_t user_disp;
- mach_msg_type_name_t result_disp;
- mach_msg_type_number_t count;
- mach_msg_copy_options_t copy_option;
- boolean_t deallocate;
-
- volatile mach_msg_ool_ports_descriptor_t *dsc;
-
- if (differs) {
- volatile OTHER_OOL_PORTS_DESCRIPTOR *user_dsc;
-
- user_dsc = (OTHER_OOL_PORTS_DESCRIPTOR *)&daddr->ool_ports;
- addr = (mach_vm_offset_t)user_dsc->address;
- count = user_dsc->count;
- deallocate = user_dsc->deallocate;
- copy_option = user_dsc->copy;
- user_disp = user_dsc->disposition;
- } else {
- volatile mach_msg_ool_ports_descriptor_t *user_dsc;
-
- user_dsc = &daddr->ool_ports;
- addr = CAST_USER_ADDR_T(user_dsc->address);
- count = user_dsc->count;
- deallocate = user_dsc->deallocate;
- copy_option = user_dsc->copy;
- user_disp = user_dsc->disposition;
- }
-
- dsc = &naddr->ool_ports;
- dsc->deallocate = deallocate;
- dsc->copy = copy_option;
- dsc->type = daddr->type.type;
- dsc->count = count;
-
- /* calculate length of data in bytes, rounding up */
- length = count * sizeof(mach_port_name_t);
-
- if (length == 0) {
- complex = TRUE;
- dsc->address = (void *) 0;
- break;
- }
-
- data = kalloc(length);
-
- if (data == NULL) {
- mr = MACH_SEND_NO_BUFFER;
- break;
- }
-
- if (copyinmap(map, addr, data, length) != KERN_SUCCESS) {
- kfree(data, length);
- mr = MACH_SEND_INVALID_MEMORY;
- break;
- }
-
- if (deallocate) {
- (void) mach_vm_deallocate(map, addr, (mach_vm_size_t)length);
- }
-
- dsc->address = data;
-
- result_disp = ipc_object_copyin_type(user_disp);
- dsc->disposition = result_disp;
-
- objects = (ipc_object_t *) data;
-
- for ( j = 0; j < count; j++) {
- mach_port_name_t port = (mach_port_name_t) objects[j];
- ipc_object_t object;
-
- if (!MACH_PORT_VALID(port))
- continue;
-
- kr = ipc_object_copyin(space, port, user_disp, &object);
+ switch (daddr->type.type) {
+ case MACH_MSG_OOL_DESCRIPTOR:
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ size = (is_task_64bit) ?
+ ((mach_msg_ool_descriptor64_t *)daddr)->size :
+ daddr->out_of_line.size;
+
+ if (daddr->out_of_line.copy != MACH_MSG_PHYSICAL_COPY &&
+ daddr->out_of_line.copy != MACH_MSG_VIRTUAL_COPY) {
+ /*
+ * Invalid copy option
+ */
+ mr = MACH_SEND_INVALID_TYPE;
+ goto clean_message;
+ }
- if (kr != KERN_SUCCESS) {
- unsigned int k;
+ if ((size >= MSG_OOL_SIZE_SMALL) &&
+ (daddr->out_of_line.copy == MACH_MSG_PHYSICAL_COPY) &&
+ !(daddr->out_of_line.deallocate)) {
+ /*
+ * Out-of-line memory descriptor, accumulate kernel
+ * memory requirements
+ */
+ if (space_needed + round_page(size) <= space_needed) {
+ /* Overflow dectected */
+ mr = MACH_MSG_VM_KERNEL;
+ goto clean_message;
+ }
- for(k = 0; k < j; k++) {
- object = objects[k];
- if (IPC_OBJECT_VALID(object))
- ipc_object_destroy(object, result_disp);
+ space_needed += round_page(size);
+ if (space_needed > ipc_kmsg_max_vm_space) {
+ /* Per message kernel memory limit exceeded */
+ mr = MACH_MSG_VM_KERNEL;
+ goto clean_message;
+ }
}
- kfree(data, length);
- mr = MACH_SEND_INVALID_RIGHT;
break;
- }
-
- if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
- ipc_port_check_circularity(
- (ipc_port_t) object,
- (ipc_port_t) dest))
- kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
-
- objects[j] = object;
+ case MACH_MSG_PORT_DESCRIPTOR:
+ if (os_add_overflow(total_ool_port_count, 1, &total_ool_port_count)) {
+ /* Overflow detected */
+ mr = MACH_SEND_TOO_LARGE;
+ goto clean_message;
+ }
+ contains_port_desc = TRUE;
+ break;
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR:
+ ool_port_count = (is_task_64bit) ?
+ ((mach_msg_ool_ports_descriptor64_t *)daddr)->count :
+ daddr->ool_ports.count;
+
+ if (os_add_overflow(total_ool_port_count, ool_port_count, &total_ool_port_count)) {
+ /* Overflow detected */
+ mr = MACH_SEND_TOO_LARGE;
+ goto clean_message;
+ }
+
+ if (ool_port_count > (ipc_kmsg_max_vm_space / sizeof(mach_port_t))) {
+ /* Per message kernel memory limit exceeded */
+ mr = MACH_SEND_TOO_LARGE;
+ goto clean_message;
+ }
+ contains_port_desc = TRUE;
+ break;
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ guard_flags = (is_task_64bit) ?
+ ((mach_msg_guarded_port_descriptor64_t *)daddr)->flags :
+ ((mach_msg_guarded_port_descriptor32_t *)daddr)->flags;
+ context = (is_task_64bit) ?
+ ((mach_msg_guarded_port_descriptor64_t *)daddr)->context :
+ ((mach_msg_guarded_port_descriptor32_t *)daddr)->context;
+ disp = (is_task_64bit) ?
+ ((mach_msg_guarded_port_descriptor64_t *)daddr)->disposition :
+ ((mach_msg_guarded_port_descriptor32_t *)daddr)->disposition;
+
+ /* Only MACH_MSG_TYPE_MOVE_RECEIVE is supported for now */
+ if (!guard_flags || ((guard_flags & ~MACH_MSG_GUARD_FLAGS_MASK) != 0) ||
+ ((guard_flags & MACH_MSG_GUARD_FLAGS_UNGUARDED_ON_SEND) && (context != 0)) ||
+ (disp != MACH_MSG_TYPE_MOVE_RECEIVE)) {
+ /*
+ * Invalid guard flags, context or disposition
+ */
+ mr = MACH_SEND_INVALID_TYPE;
+ goto clean_message;
+ }
+ if (os_add_overflow(total_ool_port_count, 1, &total_ool_port_count)) {
+ /* Overflow detected */
+ mr = MACH_SEND_TOO_LARGE;
+ goto clean_message;
+ }
+ contains_port_desc = TRUE;
+ break;
+ }
+ }
+
+ /* Sending more than 16383 rights in one message seems crazy */
+ if (total_ool_port_count >= (MACH_PORT_UREFS_MAX / 4)) {
+ mr = MACH_SEND_TOO_LARGE;
+ goto clean_message;
+ }
+
+ /*
+ * Check if dest is a no-grant port; Since this bit is set only on
+ * port construction and cannot be unset later, we can peek at the
+ * bit without paying the cost of locking the port.
+ */
+ if (contains_port_desc && remote_port->ip_no_grant) {
+ mr = MACH_SEND_NO_GRANT_DEST;
+ goto clean_message;
+ }
+
+ /*
+ * Allocate space in the pageable kernel ipc copy map for all the
+ * ool data that is to be physically copied. Map is marked wait for
+ * space.
+ */
+ if (space_needed) {
+ if (vm_allocate_kernel(ipc_kernel_copy_map, &paddr, space_needed,
+ VM_FLAGS_ANYWHERE, VM_KERN_MEMORY_IPC) != KERN_SUCCESS) {
+ mr = MACH_MSG_VM_KERNEL;
+ goto clean_message;
}
-
- complex = TRUE;
- break;
- }
- default: {
- /*
- * Invalid descriptor
- */
- mr = MACH_SEND_INVALID_TYPE;
- break;
- }
}
- if (MACH_MSG_SUCCESS != mr) {
- ipc_kmsg_clean_partial(kmsg, dsc_count - i,
- naddr + 1, paddr, space_needed);
- goto out;
+ /* user_addr = just after base as it was copied in */
+ user_addr = (mach_msg_descriptor_t *)((vm_offset_t)kmsg->ikm_header + sizeof(mach_msg_base_t));
+
+ /* Shift the mach_msg_base_t down to make room for dsc_count*16bytes of descriptors on 64 bit kernels
+ */
+ if (descriptor_size != 16 * dsc_count) {
+ vm_offset_t dsc_adjust = 16 * dsc_count - descriptor_size;
+
+ memmove((char *)(((vm_offset_t)kmsg->ikm_header) - dsc_adjust), kmsg->ikm_header, sizeof(mach_msg_base_t));
+ kmsg->ikm_header = (mach_msg_header_t *)((vm_offset_t)kmsg->ikm_header - dsc_adjust);
+
+ /* Update the message size for the larger in-kernel representation */
+ kmsg->ikm_header->msgh_size += (mach_msg_size_t)dsc_adjust;
}
- } while (--i > 0
- &&
- (daddr = (differs) ? (mach_msg_descriptor_t *)((vm_offset_t)(daddr) -
- user_desc_sizes[i - 1]) : daddr - 1)
- &&
- naddr--);
-
- if (!complex) {
- kmsg->ikm_header->msgh_bits &= ~MACH_MSGH_BITS_COMPLEX;
- }
- if (differs && naddr != daddr) {
- mach_msg_base_t *old_base = (mach_msg_base_t *)kmsg->ikm_header;
- mach_msg_base_t *new_base = (mach_msg_base_t *)naddr - 1;
+ /* kern_addr = just after base after it has been (conditionally) moved */
+ kern_addr = (mach_msg_descriptor_t *)((vm_offset_t)kmsg->ikm_header + sizeof(mach_msg_base_t));
+
+ /* handle the OOL regions and port descriptors. */
+ for (i = 0; i < dsc_count; i++) {
+ switch (user_addr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR:
+ user_addr = ipc_kmsg_copyin_port_descriptor((mach_msg_port_descriptor_t *)kern_addr,
+ (mach_msg_legacy_port_descriptor_t *)user_addr, space, dest, kmsg, optionp, &mr);
+ kern_addr++;
+ complex = TRUE;
+ break;
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR:
+ user_addr = ipc_kmsg_copyin_ool_descriptor((mach_msg_ool_descriptor_t *)kern_addr,
+ user_addr, is_task_64bit, &paddr, ©, &space_needed, map, optionp, &mr);
+ kern_addr++;
+ complex = TRUE;
+ break;
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR:
+ user_addr = ipc_kmsg_copyin_ool_ports_descriptor((mach_msg_ool_ports_descriptor_t *)kern_addr,
+ user_addr, is_task_64bit, map, space, dest, kmsg, optionp, &mr);
+ kern_addr++;
+ complex = TRUE;
+ break;
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ user_addr = ipc_kmsg_copyin_guarded_port_descriptor((mach_msg_guarded_port_descriptor_t *)kern_addr,
+ user_addr, is_task_64bit, space, dest, kmsg, optionp, &mr);
+ kern_addr++;
+ complex = TRUE;
+ break;
+ default:
+ /* Invalid descriptor */
+ mr = MACH_SEND_INVALID_TYPE;
+ break;
+ }
- memmove(new_base, old_base, sizeof(mach_msg_base_t));
- new_base->header.msgh_size -= (vm_offset_t)naddr - (vm_offset_t)daddr;
- kmsg->ikm_header = &new_base->header;
- }
+ if (MACH_MSG_SUCCESS != mr) {
+ /* clean from start of message descriptors to i */
+ ipc_kmsg_clean_partial(kmsg, i,
+ (mach_msg_descriptor_t *)((mach_msg_base_t *)kmsg->ikm_header + 1),
+ paddr, space_needed);
+ goto out;
+ }
+ } /* End of loop */
- out:
- if (differs && dsc_count > DESC_COUNT_SMALL)
- kfree(user_desc_sizes, body->msgh_descriptor_count * sizeof(vm_size_t));
+ if (!complex) {
+ kmsg->ikm_header->msgh_bits &= ~MACH_MSGH_BITS_COMPLEX;
+ }
+out:
+ return mr;
- return mr;
+clean_message:
+ /* no descriptors have been copied in yet */
+ ipc_kmsg_clean_partial(kmsg, 0, NULL, 0, 0);
+ return mr;
}
* MACH_MSG_SUCCESS Successful copyin.
* MACH_SEND_INVALID_HEADER
* Illegal value in the message header bits.
- * MACH_SEND_INVALID_NOTIFY Bad notify port.
* MACH_SEND_INVALID_DEST Can't copyin destination port.
* MACH_SEND_INVALID_REPLY Can't copyin reply port.
* MACH_SEND_INVALID_MEMORY Can't grab out-of-line memory.
mach_msg_return_t
ipc_kmsg_copyin(
- ipc_kmsg_t kmsg,
- ipc_space_t space,
- vm_map_t map,
- mach_port_name_t notify)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ vm_map_t map,
+ mach_msg_priority_t override,
+ mach_msg_option_t *optionp)
{
- mach_msg_return_t mr;
-
- mr = ipc_kmsg_copyin_header(kmsg->ikm_header, space, notify);
- if (mr != MACH_MSG_SUCCESS)
+ mach_msg_return_t mr;
+
+ kmsg->ikm_header->msgh_bits &= MACH_MSGH_BITS_USER;
+
+ mr = ipc_kmsg_copyin_header(kmsg, space, override, optionp);
+
+ if (mr != MACH_MSG_SUCCESS) {
+ return mr;
+ }
+
+ KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_MSG_SEND) | DBG_FUNC_NONE,
+ VM_KERNEL_ADDRPERM((uintptr_t)kmsg),
+ (uintptr_t)kmsg->ikm_header->msgh_bits,
+ (uintptr_t)kmsg->ikm_header->msgh_id,
+ VM_KERNEL_ADDRPERM((uintptr_t)unsafe_convert_port_to_voucher(kmsg->ikm_voucher)),
+ 0);
+
+ DEBUG_KPRINT_SYSCALL_IPC("ipc_kmsg_copyin header:\n%.8x\n%.8x\n%p\n%p\n%p\n%.8x\n",
+ kmsg->ikm_header->msgh_size,
+ kmsg->ikm_header->msgh_bits,
+ kmsg->ikm_header->msgh_remote_port,
+ kmsg->ikm_header->msgh_local_port,
+ kmsg->ikm_voucher,
+ kmsg->ikm_header->msgh_id);
+
+ if ((kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) == 0) {
+ return MACH_MSG_SUCCESS;
+ }
+
+ mr = ipc_kmsg_copyin_body( kmsg, space, map, optionp);
+ /* unreachable if !DEBUG */
+ __unreachable_ok_push
+ if (DEBUG_KPRINT_SYSCALL_PREDICATE(DEBUG_KPRINT_SYSCALL_IPC_MASK)) {
+ kprintf("body:\n");
+ uint32_t i;
+ for (i = 0; i * 4 < (kmsg->ikm_header->msgh_size - sizeof(mach_msg_header_t)); i++) {
+ kprintf("%.4x\n", ((uint32_t *)(kmsg->ikm_header + 1))[i]);
+ }
+ }
+ __unreachable_ok_pop
+
return mr;
-
- if ((kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) == 0)
+}
+
+/*
+ * Routine: ipc_kmsg_copyin_from_kernel
+ * Purpose:
+ * "Copy-in" port rights and out-of-line memory
+ * in a message sent from the kernel.
+ *
+ * Because the message comes from the kernel,
+ * the implementation assumes there are no errors
+ * or peculiarities in the message.
+ * Conditions:
+ * Nothing locked.
+ */
+
+mach_msg_return_t
+ipc_kmsg_copyin_from_kernel(
+ ipc_kmsg_t kmsg)
+{
+ mach_msg_bits_t bits = kmsg->ikm_header->msgh_bits;
+ mach_msg_type_name_t rname = MACH_MSGH_BITS_REMOTE(bits);
+ mach_msg_type_name_t lname = MACH_MSGH_BITS_LOCAL(bits);
+ ipc_object_t remote = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ ipc_object_t local = ip_to_object(kmsg->ikm_header->msgh_local_port);
+ ipc_port_t dest = kmsg->ikm_header->msgh_remote_port;
+
+ /* translate the destination and reply ports */
+ if (!IO_VALID(remote)) {
+ return MACH_SEND_INVALID_DEST;
+ }
+
+ ipc_object_copyin_from_kernel(remote, rname);
+ if (IO_VALID(local)) {
+ ipc_object_copyin_from_kernel(local, lname);
+ }
+
+ /*
+ * The common case is a complex message with no reply port,
+ * because that is what the memory_object interface uses.
+ */
+
+ if (bits == (MACH_MSGH_BITS_COMPLEX |
+ MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0))) {
+ bits = (MACH_MSGH_BITS_COMPLEX |
+ MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND, 0));
+
+ kmsg->ikm_header->msgh_bits = bits;
+ } else {
+ bits = (MACH_MSGH_BITS_OTHER(bits) |
+ MACH_MSGH_BITS(ipc_object_copyin_type(rname),
+ ipc_object_copyin_type(lname)));
+
+ kmsg->ikm_header->msgh_bits = bits;
+ if ((bits & MACH_MSGH_BITS_COMPLEX) == 0) {
+ return MACH_MSG_SUCCESS;
+ }
+ }
+
+ /*
+ * Check if the remote port accepts ports in the body.
+ */
+ if (dest->ip_no_grant) {
+ mach_msg_descriptor_t *saddr;
+ mach_msg_body_t *body;
+ mach_msg_type_number_t i, count;
+
+ body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
+ saddr = (mach_msg_descriptor_t *) (body + 1);
+ count = body->msgh_descriptor_count;
+
+ for (i = 0; i < count; i++, saddr++) {
+ switch (saddr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR:
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR:
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ /* no descriptors have been copied in yet */
+ ipc_kmsg_clean_partial(kmsg, 0, NULL, 0, 0);
+ return MACH_SEND_NO_GRANT_DEST;
+ }
+ }
+ }
+ {
+ mach_msg_descriptor_t *saddr;
+ mach_msg_body_t *body;
+ mach_msg_type_number_t i, count;
+
+ body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
+ saddr = (mach_msg_descriptor_t *) (body + 1);
+ count = body->msgh_descriptor_count;
+
+ for (i = 0; i < count; i++, saddr++) {
+ switch (saddr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR: {
+ mach_msg_type_name_t name;
+ ipc_object_t object;
+ mach_msg_port_descriptor_t *dsc;
+
+ dsc = &saddr->port;
+
+ /* this is really the type SEND, SEND_ONCE, etc. */
+ name = dsc->disposition;
+ object = ip_to_object(dsc->name);
+ dsc->disposition = ipc_object_copyin_type(name);
+
+ if (!IO_VALID(object)) {
+ break;
+ }
+
+ ipc_object_copyin_from_kernel(object, name);
+
+ /* CDY avoid circularity when the destination is also */
+ /* the kernel. This check should be changed into an */
+ /* assert when the new kobject model is in place since*/
+ /* ports will not be used in kernel to kernel chats */
+
+ if (ip_object_to_port(remote)->ip_receiver != ipc_space_kernel) {
+ if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(remote))) {
+ kmsg->ikm_header->msgh_bits |=
+ MACH_MSGH_BITS_CIRCULAR;
+ }
+ }
+ break;
+ }
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR: {
+ /*
+ * The sender should supply ready-made memory, i.e.
+ * a vm_map_copy_t, so we don't need to do anything.
+ */
+ break;
+ }
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
+ ipc_object_t *objects;
+ unsigned int j;
+ mach_msg_type_name_t name;
+ mach_msg_ool_ports_descriptor_t *dsc;
+
+ dsc = (mach_msg_ool_ports_descriptor_t *)&saddr->ool_ports;
+
+ /* this is really the type SEND, SEND_ONCE, etc. */
+ name = dsc->disposition;
+ dsc->disposition = ipc_object_copyin_type(name);
+
+ objects = (ipc_object_t *) dsc->address;
+
+ for (j = 0; j < dsc->count; j++) {
+ ipc_object_t object = objects[j];
+
+ if (!IO_VALID(object)) {
+ continue;
+ }
+
+ ipc_object_copyin_from_kernel(object, name);
+
+ if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(remote))) {
+ kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
+ }
+ }
+ break;
+ }
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR: {
+ mach_msg_guarded_port_descriptor_t *dsc = (typeof(dsc)) & saddr->guarded_port;
+ mach_msg_type_name_t disp = dsc->disposition;
+ ipc_object_t object = ip_to_object(dsc->name);
+ dsc->disposition = ipc_object_copyin_type(disp);
+ assert(dsc->flags == 0);
+
+ if (!IO_VALID(object)) {
+ break;
+ }
+
+ ipc_object_copyin_from_kernel(object, disp);
+ /*
+ * avoid circularity when the destination is also
+ * the kernel. This check should be changed into an
+ * assert when the new kobject model is in place since
+ * ports will not be used in kernel to kernel chats
+ */
+
+ if (ip_object_to_port(remote)->ip_receiver != ipc_space_kernel) {
+ if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(remote))) {
+ kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
+ }
+ }
+ break;
+ }
+ default: {
+#if MACH_ASSERT
+ panic("ipc_kmsg_copyin_from_kernel: bad descriptor");
+#endif /* MACH_ASSERT */
+ }
+ }
+ }
+ }
return MACH_MSG_SUCCESS;
-
- return( ipc_kmsg_copyin_body( kmsg, space, map) );
}
-/*
- * Routine: ipc_kmsg_copyin_from_kernel
- * Purpose:
- * "Copy-in" port rights and out-of-line memory
- * in a message sent from the kernel.
- *
- * Because the message comes from the kernel,
- * the implementation assumes there are no errors
- * or peculiarities in the message.
- *
- * Returns TRUE if queueing the message
- * would result in a circularity.
- * Conditions:
- * Nothing locked.
- */
-
-void
-ipc_kmsg_copyin_from_kernel(
- ipc_kmsg_t kmsg)
+#if IKM_SUPPORT_LEGACY
+mach_msg_return_t
+ipc_kmsg_copyin_from_kernel_legacy(
+ ipc_kmsg_t kmsg)
{
mach_msg_bits_t bits = kmsg->ikm_header->msgh_bits;
mach_msg_type_name_t rname = MACH_MSGH_BITS_REMOTE(bits);
mach_msg_type_name_t lname = MACH_MSGH_BITS_LOCAL(bits);
- ipc_object_t remote = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
- ipc_object_t local = (ipc_object_t) kmsg->ikm_header->msgh_local_port;
+ ipc_object_t remote = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ ipc_object_t local = ip_to_object(kmsg->ikm_header->msgh_local_port);
+ ipc_port_t dest = kmsg->ikm_header->msgh_remote_port;
/* translate the destination and reply ports */
+ if (!IO_VALID(remote)) {
+ return MACH_SEND_INVALID_DEST;
+ }
ipc_object_copyin_from_kernel(remote, rname);
- if (IO_VALID(local))
+ if (IO_VALID(local)) {
ipc_object_copyin_from_kernel(local, lname);
+ }
/*
* The common case is a complex message with no reply port,
*/
if (bits == (MACH_MSGH_BITS_COMPLEX |
- MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0))) {
+ MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0))) {
bits = (MACH_MSGH_BITS_COMPLEX |
- MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND, 0));
+ MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND, 0));
kmsg->ikm_header->msgh_bits = bits;
} else {
bits = (MACH_MSGH_BITS_OTHER(bits) |
- MACH_MSGH_BITS(ipc_object_copyin_type(rname),
- ipc_object_copyin_type(lname)));
+ MACH_MSGH_BITS(ipc_object_copyin_type(rname),
+ ipc_object_copyin_type(lname)));
kmsg->ikm_header->msgh_bits = bits;
- if ((bits & MACH_MSGH_BITS_COMPLEX) == 0)
- return;
+ if ((bits & MACH_MSGH_BITS_COMPLEX) == 0) {
+ return MACH_MSG_SUCCESS;
+ }
}
- {
- mach_msg_descriptor_t *saddr, *eaddr;
- mach_msg_body_t *body;
-
- body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
- saddr = (mach_msg_descriptor_t *) (body + 1);
- eaddr = (mach_msg_descriptor_t *) saddr + body->msgh_descriptor_count;
-
- for ( ; saddr < eaddr; saddr++) {
-
- switch (saddr->type.type) {
-
- case MACH_MSG_PORT_DESCRIPTOR: {
- mach_msg_type_name_t name;
- ipc_object_t object;
- mach_msg_port_descriptor_t *dsc;
-
- dsc = &saddr->port;
-
- /* this is really the type SEND, SEND_ONCE, etc. */
- name = dsc->disposition;
- object = (ipc_object_t) dsc->name;
- dsc->disposition = ipc_object_copyin_type(name);
-
- if (!IO_VALID(object)) {
- break;
- }
-
- ipc_object_copyin_from_kernel(object, name);
-
- /* CDY avoid circularity when the destination is also */
- /* the kernel. This check should be changed into an */
- /* assert when the new kobject model is in place since*/
- /* ports will not be used in kernel to kernel chats */
-
- if (((ipc_port_t)remote)->ip_receiver != ipc_space_kernel) {
- if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
- ipc_port_check_circularity((ipc_port_t) object,
- (ipc_port_t) remote)) {
- kmsg->ikm_header->msgh_bits |=
- MACH_MSGH_BITS_CIRCULAR;
- }
- }
- break;
- }
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_DESCRIPTOR: {
- /*
- * The sender should supply ready-made memory, i.e.
- * a vm_map_copy_t, so we don't need to do anything.
- */
- break;
- }
- case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
- ipc_object_t *objects;
- unsigned int j;
- mach_msg_type_name_t name;
- mach_msg_ool_ports_descriptor_t *dsc;
-
- dsc = &saddr->ool_ports;
-
- /* this is really the type SEND, SEND_ONCE, etc. */
- name = dsc->disposition;
- dsc->disposition = ipc_object_copyin_type(name);
-
- objects = (ipc_object_t *) dsc->address;
-
- for ( j = 0; j < dsc->count; j++) {
- ipc_object_t object = objects[j];
-
- if (!IO_VALID(object))
- continue;
-
- ipc_object_copyin_from_kernel(object, name);
-
- if ((dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
- ipc_port_check_circularity(
- (ipc_port_t) object,
- (ipc_port_t) remote))
- kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
- }
- break;
- }
- default: {
-#if MACH_ASSERT
- panic("ipc_kmsg_copyin_from_kernel: bad descriptor");
-#endif /* MACH_ASSERT */
- }
- }
- }
- }
+
+ if (dest->ip_no_grant) {
+ mach_msg_descriptor_t *saddr;
+ mach_msg_body_t *body;
+ mach_msg_type_number_t i, count;
+
+ body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
+ saddr = (mach_msg_descriptor_t *) (body + 1);
+ count = body->msgh_descriptor_count;
+
+ for (i = 0; i < count; i++, saddr++) {
+ switch (saddr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR:
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR:
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ /* no descriptors have been copied in yet */
+ ipc_kmsg_clean_partial(kmsg, 0, NULL, 0, 0);
+ return MACH_SEND_NO_GRANT_DEST;
+ }
+ }
+ }
+
+ {
+ mach_msg_legacy_descriptor_t *saddr;
+ mach_msg_descriptor_t *daddr;
+ mach_msg_body_t *body;
+ mach_msg_type_number_t i, count;
+
+ body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
+ saddr = (typeof(saddr))(body + 1);
+ count = body->msgh_descriptor_count;
+
+ if (count) {
+ vm_offset_t dsc_adjust = 4 * count;
+ memmove((char *)(((vm_offset_t)kmsg->ikm_header) - dsc_adjust), kmsg->ikm_header, sizeof(mach_msg_base_t));
+ kmsg->ikm_header = (mach_msg_header_t *)((vm_offset_t)kmsg->ikm_header - dsc_adjust);
+ /* Update the message size for the larger in-kernel representation */
+ kmsg->ikm_header->msgh_size += dsc_adjust;
+ }
+ daddr = (mach_msg_descriptor_t *)((vm_offset_t)kmsg->ikm_header + sizeof(mach_msg_base_t));
+
+ for (i = 0; i < count; i++, saddr++, daddr++) {
+ switch (saddr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR: {
+ mach_msg_type_name_t name;
+ ipc_object_t object;
+ mach_msg_legacy_port_descriptor_t *dsc;
+ mach_msg_port_descriptor_t *dest_dsc;
+
+ dsc = (typeof(dsc)) & saddr->port;
+ dest_dsc = &daddr->port;
+
+ /* this is really the type SEND, SEND_ONCE, etc. */
+ name = dsc->disposition;
+ object = ip_to_object(CAST_MACH_NAME_TO_PORT(dsc->name));
+ dest_dsc->disposition = ipc_object_copyin_type(name);
+ dest_dsc->name = ip_object_to_port(object);
+ dest_dsc->type = MACH_MSG_PORT_DESCRIPTOR;
+
+ if (!IO_VALID(object)) {
+ break;
+ }
+
+ ipc_object_copyin_from_kernel(object, name);
+
+ /* CDY avoid circularity when the destination is also */
+ /* the kernel. This check should be changed into an */
+ /* assert when the new kobject model is in place since*/
+ /* ports will not be used in kernel to kernel chats */
+
+ if (ip_object_to_port(remote)->ip_receiver != ipc_space_kernel) {
+ if ((dest_dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(remote))) {
+ kmsg->ikm_header->msgh_bits |=
+ MACH_MSGH_BITS_CIRCULAR;
+ }
+ }
+ break;
+ }
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR: {
+ /* The sender should supply ready-made memory, i.e. a vm_map_copy_t
+ * so we don't need to do anything special. */
+
+ mach_msg_ool_descriptor32_t *source_dsc = &saddr->out_of_line32;
+ mach_msg_ool_descriptor_t *dest_dsc = (typeof(dest_dsc)) & daddr->out_of_line;
+
+ vm_offset_t address = source_dsc->address;
+ vm_size_t size = source_dsc->size;
+ boolean_t deallocate = source_dsc->deallocate;
+ mach_msg_copy_options_t copy = source_dsc->copy;
+ mach_msg_descriptor_type_t type = source_dsc->type;
+
+ dest_dsc->address = (void *)address;
+ dest_dsc->size = size;
+ dest_dsc->deallocate = deallocate;
+ dest_dsc->copy = copy;
+ dest_dsc->type = type;
+ break;
+ }
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
+ ipc_object_t *objects;
+ unsigned int j;
+ mach_msg_type_name_t name;
+ mach_msg_ool_ports_descriptor_t *dest_dsc;
+
+ mach_msg_ool_ports_descriptor32_t *source_dsc = &saddr->ool_ports32;
+ dest_dsc = (typeof(dest_dsc)) & daddr->ool_ports;
+
+ boolean_t deallocate = source_dsc->deallocate;
+ mach_msg_copy_options_t copy = source_dsc->copy;
+ mach_msg_size_t port_count = source_dsc->count;
+ mach_msg_type_name_t disposition = source_dsc->disposition;
+
+ /* this is really the type SEND, SEND_ONCE, etc. */
+ name = disposition;
+ disposition = ipc_object_copyin_type(name);
+
+ objects = (ipc_object_t *) (uintptr_t)source_dsc->address;
+
+ for (j = 0; j < port_count; j++) {
+ ipc_object_t object = objects[j];
+
+ if (!IO_VALID(object)) {
+ continue;
+ }
+
+ ipc_object_copyin_from_kernel(object, name);
+
+ if ((disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(remote))) {
+ kmsg->ikm_header->msgh_bits |= MACH_MSGH_BITS_CIRCULAR;
+ }
+ }
+
+ dest_dsc->address = objects;
+ dest_dsc->deallocate = deallocate;
+ dest_dsc->copy = copy;
+ dest_dsc->disposition = disposition;
+ dest_dsc->type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
+ dest_dsc->count = port_count;
+ break;
+ }
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR: {
+ mach_msg_type_name_t disp;
+ ipc_object_t object;
+ mach_msg_guarded_port_descriptor32_t *dsc;
+ mach_msg_guarded_port_descriptor_t *dest_dsc;
+
+ dsc = (typeof(dsc)) & saddr->guarded_port32;
+ dest_dsc = &daddr->guarded_port;
+
+ disp = dsc->disposition;
+ object = ip_to_object(CAST_MACH_NAME_TO_PORT(dsc->name));
+ assert(dsc->flags == 0);
+ assert(dsc->context == 0);
+
+ dest_dsc->disposition = ipc_object_copyin_type(disp);
+ dest_dsc->name = ip_object_to_port(object);
+ dest_dsc->type = MACH_MSG_GUARDED_PORT_DESCRIPTOR;
+ dest_dsc->flags = 0;
+
+ if (!IO_VALID(object)) {
+ break;
+ }
+
+ ipc_object_copyin_from_kernel(object, disp);
+
+ /* CDY avoid circularity when the destination is also */
+ /* the kernel. This check should be changed into an */
+ /* assert when the new kobject model is in place since*/
+ /* ports will not be used in kernel to kernel chats */
+
+ if (ip_object_to_port(remote)->ip_receiver != ipc_space_kernel) {
+ if ((dest_dsc->disposition == MACH_MSG_TYPE_PORT_RECEIVE) &&
+ ipc_port_check_circularity(ip_object_to_port(object),
+ ip_object_to_port(remote))) {
+ kmsg->ikm_header->msgh_bits |=
+ MACH_MSGH_BITS_CIRCULAR;
+ }
+ }
+ break;
+ }
+ default: {
+#if MACH_ASSERT
+ panic("ipc_kmsg_copyin_from_kernel: bad descriptor");
+#endif /* MACH_ASSERT */
+ }
+ }
+ }
+ }
+ return MACH_MSG_SUCCESS;
}
+#endif /* IKM_SUPPORT_LEGACY */
/*
* Routine: ipc_kmsg_copyout_header
* If it does succeed the remote/local port fields
* contain port names instead of object pointers,
* and the bits field is updated.
- *
- * The notify argument implements the MACH_RCV_NOTIFY option.
- * If it is not MACH_PORT_NULL, it should name a receive right.
- * If the process of receiving the reply port creates a
- * new right in the receiving task, then the new right is
- * automatically registered for a dead-name notification,
- * with the notify port supplying the send-once right.
* Conditions:
* Nothing locked.
* Returns:
* MACH_MSG_SUCCESS Copied out port rights.
- * MACH_RCV_INVALID_NOTIFY
+ * MACH_RCV_INVALID_NOTIFY
* Notify is non-null and doesn't name a receive right.
* (Either KERN_INVALID_NAME or KERN_INVALID_RIGHT.)
* MACH_RCV_HEADER_ERROR|MACH_MSG_IPC_SPACE
mach_msg_return_t
ipc_kmsg_copyout_header(
- mach_msg_header_t *msg,
- ipc_space_t space,
- mach_port_name_t notify)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ mach_msg_option_t option)
{
+ mach_msg_header_t *msg = kmsg->ikm_header;
mach_msg_bits_t mbits = msg->msgh_bits;
- ipc_port_t dest = (ipc_port_t) msg->msgh_remote_port;
+ ipc_port_t dest = msg->msgh_remote_port;
assert(IP_VALID(dest));
- {
- mach_msg_type_name_t dest_type = MACH_MSGH_BITS_REMOTE(mbits);
- mach_msg_type_name_t reply_type = MACH_MSGH_BITS_LOCAL(mbits);
- ipc_port_t reply = (ipc_port_t) msg->msgh_local_port;
- mach_port_name_t dest_name, reply_name;
-
- if (IP_VALID(reply)) {
- ipc_port_t notify_port;
- ipc_entry_t entry;
+ /*
+ * While we still hold a reference on the received-from port,
+ * process all send-possible notfications we received along with
+ * the message.
+ */
+ ipc_port_spnotify(dest);
+
+ {
+ mach_msg_type_name_t dest_type = MACH_MSGH_BITS_REMOTE(mbits);
+ mach_msg_type_name_t reply_type = MACH_MSGH_BITS_LOCAL(mbits);
+ mach_msg_type_name_t voucher_type = MACH_MSGH_BITS_VOUCHER(mbits);
+ ipc_port_t reply = msg->msgh_local_port;
+ ipc_port_t release_reply_port = IP_NULL;
+ mach_port_name_t dest_name, reply_name;
+
+ ipc_port_t voucher = kmsg->ikm_voucher;
+ ipc_port_t release_voucher_port = IP_NULL;
+ mach_port_name_t voucher_name;
+
+ uint32_t entries_held = 0;
+ boolean_t need_write_lock = FALSE;
kern_return_t kr;
/*
- * Handling notify (for MACH_RCV_NOTIFY) is tricky.
- * The problem is atomically making a send-once right
- * from the notify port and installing it for a
- * dead-name request in the new entry, because this
- * requires two port locks (on the notify port and
- * the reply port). However, we can safely make
- * and consume send-once rights for the notify port
- * as long as we hold the space locked. This isn't
- * an atomicity problem, because the only way
- * to detect that a send-once right has been created
- * and then consumed if it wasn't needed is by getting
- * at the receive right to look at ip_sorights, and
- * because the space is write-locked status calls can't
- * lookup the notify port receive right. When we make
- * the send-once right, we lock the notify port,
- * so any status calls in progress will be done.
+ * Reserve any potentially needed entries in the target space.
+ * We'll free any unused before unlocking the space.
*/
+ if (IP_VALID(reply)) {
+ entries_held++;
+ need_write_lock = TRUE;
+ }
+ if (IP_VALID(voucher)) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
- is_write_lock(space);
-
- for (;;) {
- ipc_port_request_index_t request;
-
- if (!space->is_active) {
- is_write_unlock(space);
- return (MACH_RCV_HEADER_ERROR|
- MACH_MSG_IPC_SPACE);
+ if ((option & MACH_RCV_VOUCHER) != 0) {
+ entries_held++;
}
+ need_write_lock = TRUE;
+ }
- if (notify != MACH_PORT_NULL) {
- notify_port = ipc_port_lookup_notify(space,
- notify);
- if (notify_port == IP_NULL) {
+ if (need_write_lock) {
+ is_write_lock(space);
+
+ while (entries_held) {
+ if (!is_active(space)) {
is_write_unlock(space);
- return MACH_RCV_INVALID_NOTIFY;
+ return MACH_RCV_HEADER_ERROR |
+ MACH_MSG_IPC_SPACE;
}
- } else
- notify_port = IP_NULL;
-
- if ((reply_type != MACH_MSG_TYPE_PORT_SEND_ONCE) &&
- ipc_right_reverse(space, (ipc_object_t) reply,
- &reply_name, &entry)) {
- /* reply port is locked and active */
- /*
- * We don't need the notify_port
- * send-once right, but we can't release
- * it here because reply port is locked.
- * Wait until after the copyout to
- * release the notify port right.
- */
+ kr = ipc_entries_hold(space, entries_held);
+ if (KERN_SUCCESS == kr) {
+ break;
+ }
- assert(entry->ie_bits &
- MACH_PORT_TYPE_SEND_RECEIVE);
- break;
+ kr = ipc_entry_grow_table(space, ITS_SIZE_NONE);
+ if (KERN_SUCCESS != kr) {
+ return MACH_RCV_HEADER_ERROR |
+ MACH_MSG_IPC_SPACE;
+ }
+ /* space was unlocked and relocked - retry */
}
- ip_lock(reply);
- if (!ip_active(reply)) {
- ip_release(reply);
- ip_check_unlock(reply);
+ /* Handle reply port. */
+ if (IP_VALID(reply)) {
+ ipc_entry_t entry;
+
+ /* Is there already an entry we can use? */
+ if ((reply_type != MACH_MSG_TYPE_PORT_SEND_ONCE) &&
+ ipc_right_reverse(space, ip_to_object(reply), &reply_name, &entry)) {
+ /* reply port is locked and active */
+ assert(entry->ie_bits & MACH_PORT_TYPE_SEND_RECEIVE);
+ } else {
+ ip_lock(reply);
+ if (!ip_active(reply)) {
+ /* clear the context value */
+ reply->ip_reply_context = 0;
+ ip_unlock(reply);
+
+ release_reply_port = reply;
+ reply = IP_DEAD;
+ reply_name = MACH_PORT_DEAD;
+ goto done_with_reply;
+ }
+
+ /* claim a held entry for the reply port */
+ assert(entries_held > 0);
+ entries_held--;
+ ipc_entry_claim(space, &reply_name, &entry);
+ assert(IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE);
+ assert(entry->ie_object == IO_NULL);
+ entry->ie_object = ip_to_object(reply);
+ }
- if (notify_port != IP_NULL)
- ipc_port_release_sonce(notify_port);
+ /* space and reply port are locked and active */
+ ip_reference(reply); /* hold onto the reply port */
- ip_lock(dest);
- is_write_unlock(space);
+ /*
+ * If the receiver would like to enforce strict reply
+ * semantics, and the message looks like it expects a reply,
+ * and contains a voucher, then link the context in the
+ * voucher with the reply port so that the next message sent
+ * to the reply port must come from a thread that has a
+ * matching context (voucher).
+ */
+ if (enforce_strict_reply && MACH_RCV_WITH_STRICT_REPLY(option) && IP_VALID(voucher)) {
+ if (ipc_kmsg_validate_reply_port_locked(reply, option) != KERN_SUCCESS) {
+ /* if the receiver isn't happy with the reply port: fail the receive. */
+ ip_unlock(reply);
+ ipc_entry_dealloc(space, reply_name, entry);
+ is_write_unlock(space);
+ ip_release(reply);
+ return MACH_RCV_INVALID_REPLY;
+ }
+ ipc_kmsg_link_reply_context_locked(reply, voucher);
+ } else {
+ /*
+ * if the receive did not choose to participate
+ * in the strict reply/RPC, then don't enforce
+ * anything (as this could lead to booby-trapped
+ * messages that kill the server).
+ */
+ reply->ip_reply_context = 0;
+ }
- reply = IP_DEAD;
- reply_name = MACH_PORT_DEAD;
- goto copyout_dest;
+ kr = ipc_right_copyout(space, reply_name, entry,
+ reply_type, NULL, NULL, ip_to_object(reply));
+ assert(kr == KERN_SUCCESS);
+ /* reply port is unlocked */
+ } else {
+ reply_name = CAST_MACH_PORT_TO_NAME(reply);
}
- reply_name = (mach_port_name_t)reply;
- kr = ipc_entry_get(space, &reply_name, &entry);
- if (kr != KERN_SUCCESS) {
- ip_unlock(reply);
+done_with_reply:
+
+ /* Handle voucher port. */
+ if (voucher_type != MACH_MSGH_BITS_ZERO) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
- if (notify_port != IP_NULL)
- ipc_port_release_sonce(notify_port);
-
- /* space is locked */
- kr = ipc_entry_grow_table(space,
- ITS_SIZE_NONE);
- if (kr != KERN_SUCCESS) {
- /* space is unlocked */
-
- if (kr == KERN_RESOURCE_SHORTAGE)
- return (MACH_RCV_HEADER_ERROR|
- MACH_MSG_IPC_KERNEL);
- else
- return (MACH_RCV_HEADER_ERROR|
- MACH_MSG_IPC_SPACE);
+ if (!IP_VALID(voucher)) {
+ if ((option & MACH_RCV_VOUCHER) == 0) {
+ voucher_type = MACH_MSGH_BITS_ZERO;
+ }
+ voucher_name = MACH_PORT_NULL;
+ goto done_with_voucher;
}
- /* space is locked again; start over */
- continue;
+ /* clear voucher from its hiding place back in the kmsg */
+ kmsg->ikm_voucher = IP_NULL;
+
+ if ((option & MACH_RCV_VOUCHER) != 0) {
+ ipc_entry_t entry;
+
+ if (ipc_right_reverse(space, ip_to_object(voucher),
+ &voucher_name, &entry)) {
+ /* voucher port locked */
+ assert(entry->ie_bits & MACH_PORT_TYPE_SEND);
+ } else {
+ assert(entries_held > 0);
+ entries_held--;
+ ipc_entry_claim(space, &voucher_name, &entry);
+ assert(IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE);
+ assert(entry->ie_object == IO_NULL);
+ entry->ie_object = ip_to_object(voucher);
+ ip_lock(voucher);
+ }
+ /* space is locked and active */
+ require_ip_active(voucher);
+ assert(ip_kotype(voucher) == IKOT_VOUCHER);
+ kr = ipc_right_copyout(space, voucher_name, entry,
+ MACH_MSG_TYPE_MOVE_SEND, NULL, NULL,
+ ip_to_object(voucher));
+ /* voucher port is unlocked */
+ } else {
+ voucher_type = MACH_MSGH_BITS_ZERO;
+ release_voucher_port = voucher;
+ voucher_name = MACH_PORT_NULL;
+ }
+ } else {
+ voucher_name = msg->msgh_voucher_port;
}
- assert(IE_BITS_TYPE(entry->ie_bits) ==
- MACH_PORT_TYPE_NONE);
- assert(entry->ie_object == IO_NULL);
-
- if (notify_port == IP_NULL) {
- /* not making a dead-name request */
- entry->ie_object = (ipc_object_t) reply;
- break;
- }
+done_with_voucher:
- kr = ipc_port_dnrequest(reply, reply_name,
- notify_port, &request);
- if (kr != KERN_SUCCESS) {
- ip_unlock(reply);
+ ip_lock(dest);
+ is_write_unlock(space);
+ } else {
+ /*
+ * No reply or voucher port! This is an easy case.
+ * We only need to have the space locked
+ * when locking the destination.
+ */
- ipc_port_release_sonce(notify_port);
+ is_read_lock(space);
+ if (!is_active(space)) {
+ is_read_unlock(space);
+ return MACH_RCV_HEADER_ERROR | MACH_MSG_IPC_SPACE;
+ }
- ipc_entry_dealloc(space, reply_name, entry);
- is_write_unlock(space);
+ ip_lock(dest);
+ is_read_unlock(space);
- ip_lock(reply);
- if (!ip_active(reply)) {
- /* will fail next time around loop */
+ reply_name = CAST_MACH_PORT_TO_NAME(reply);
- ip_unlock(reply);
- is_write_lock(space);
- continue;
+ if (voucher_type != MACH_MSGH_BITS_ZERO) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
+ if ((option & MACH_RCV_VOUCHER) == 0) {
+ voucher_type = MACH_MSGH_BITS_ZERO;
}
-
- kr = ipc_port_dngrow(reply, ITS_SIZE_NONE);
- /* port is unlocked */
- if (kr != KERN_SUCCESS)
- return (MACH_RCV_HEADER_ERROR|
- MACH_MSG_IPC_KERNEL);
-
- is_write_lock(space);
- continue;
+ voucher_name = MACH_PORT_NULL;
+ } else {
+ voucher_name = msg->msgh_voucher_port;
}
-
- notify_port = IP_NULL; /* don't release right below */
-
- entry->ie_object = (ipc_object_t) reply;
- entry->ie_request = request;
- break;
}
- /* space and reply port are locked and active */
-
- ip_reference(reply); /* hold onto the reply port */
-
- kr = ipc_right_copyout(space, reply_name, entry,
- reply_type, TRUE, (ipc_object_t) reply);
- /* reply port is unlocked */
- assert(kr == KERN_SUCCESS);
-
- if (notify_port != IP_NULL)
- ipc_port_release_sonce(notify_port);
-
- ip_lock(dest);
- is_write_unlock(space);
- } else {
/*
- * No reply port! This is an easy case.
- * We only need to have the space locked
- * when checking notify and when locking
- * the destination (to ensure atomicity).
+ * At this point, the space is unlocked and the destination
+ * port is locked. (Lock taken while space was locked.)
+ * reply_name is taken care of; we still need dest_name.
+ * We still hold a ref for reply (if it is valid).
+ *
+ * If the space holds receive rights for the destination,
+ * we return its name for the right. Otherwise the task
+ * managed to destroy or give away the receive right between
+ * receiving the message and this copyout. If the destination
+ * is dead, return MACH_PORT_DEAD, and if the receive right
+ * exists somewhere else (another space, in transit)
+ * return MACH_PORT_NULL.
+ *
+ * Making this copyout operation atomic with the previous
+ * copyout of the reply port is a bit tricky. If there was
+ * no real reply port (it wasn't IP_VALID) then this isn't
+ * an issue. If the reply port was dead at copyout time,
+ * then we are OK, because if dest is dead we serialize
+ * after the death of both ports and if dest is alive
+ * we serialize after reply died but before dest's (later) death.
+ * So assume reply was alive when we copied it out. If dest
+ * is alive, then we are OK because we serialize before
+ * the ports' deaths. So assume dest is dead when we look at it.
+ * If reply dies/died after dest, then we are OK because
+ * we serialize after dest died but before reply dies.
+ * So the hard case is when reply is alive at copyout,
+ * dest is dead at copyout, and reply died before dest died.
+ * In this case pretend that dest is still alive, so
+ * we serialize while both ports are alive.
+ *
+ * Because the space lock is held across the copyout of reply
+ * and locking dest, the receive right for dest can't move
+ * in or out of the space while the copyouts happen, so
+ * that isn't an atomicity problem. In the last hard case
+ * above, this implies that when dest is dead that the
+ * space couldn't have had receive rights for dest at
+ * the time reply was copied-out, so when we pretend
+ * that dest is still alive, we can return MACH_PORT_NULL.
+ *
+ * If dest == reply, then we have to make it look like
+ * either both copyouts happened before the port died,
+ * or both happened after the port died. This special
+ * case works naturally if the timestamp comparison
+ * is done correctly.
*/
- is_read_lock(space);
- if (!space->is_active) {
- is_read_unlock(space);
- return MACH_RCV_HEADER_ERROR|MACH_MSG_IPC_SPACE;
- }
-
- if (notify != MACH_PORT_NULL) {
- ipc_entry_t entry;
+ if (ip_active(dest)) {
+ ipc_object_copyout_dest(space, ip_to_object(dest),
+ dest_type, &dest_name);
+ /* dest is unlocked */
+ } else {
+ ipc_port_timestamp_t timestamp;
- /* must check notify even though it won't be used */
+ timestamp = dest->ip_timestamp;
+ ip_unlock(dest);
+ ip_release(dest);
- if ((entry = ipc_entry_lookup(space, notify)) == IE_NULL) {
- is_read_unlock(space);
- return MACH_RCV_INVALID_NOTIFY;
- }
-
- if ((entry->ie_bits & MACH_PORT_TYPE_RECEIVE) == 0) {
- is_read_unlock(space);
- return MACH_RCV_INVALID_NOTIFY;
+ if (IP_VALID(reply)) {
+ ip_lock(reply);
+ if (ip_active(reply) ||
+ IP_TIMESTAMP_ORDER(timestamp,
+ reply->ip_timestamp)) {
+ dest_name = MACH_PORT_DEAD;
+ } else {
+ dest_name = MACH_PORT_NULL;
+ }
+ ip_unlock(reply);
+ } else {
+ dest_name = MACH_PORT_DEAD;
}
}
- ip_lock(dest);
- is_read_unlock(space);
-
- reply_name = (mach_port_name_t) reply;
- }
-
- /*
- * At this point, the space is unlocked and the destination
- * port is locked. (Lock taken while space was locked.)
- * reply_name is taken care of; we still need dest_name.
- * We still hold a ref for reply (if it is valid).
- *
- * If the space holds receive rights for the destination,
- * we return its name for the right. Otherwise the task
- * managed to destroy or give away the receive right between
- * receiving the message and this copyout. If the destination
- * is dead, return MACH_PORT_DEAD, and if the receive right
- * exists somewhere else (another space, in transit)
- * return MACH_PORT_NULL.
- *
- * Making this copyout operation atomic with the previous
- * copyout of the reply port is a bit tricky. If there was
- * no real reply port (it wasn't IP_VALID) then this isn't
- * an issue. If the reply port was dead at copyout time,
- * then we are OK, because if dest is dead we serialize
- * after the death of both ports and if dest is alive
- * we serialize after reply died but before dest's (later) death.
- * So assume reply was alive when we copied it out. If dest
- * is alive, then we are OK because we serialize before
- * the ports' deaths. So assume dest is dead when we look at it.
- * If reply dies/died after dest, then we are OK because
- * we serialize after dest died but before reply dies.
- * So the hard case is when reply is alive at copyout,
- * dest is dead at copyout, and reply died before dest died.
- * In this case pretend that dest is still alive, so
- * we serialize while both ports are alive.
- *
- * Because the space lock is held across the copyout of reply
- * and locking dest, the receive right for dest can't move
- * in or out of the space while the copyouts happen, so
- * that isn't an atomicity problem. In the last hard case
- * above, this implies that when dest is dead that the
- * space couldn't have had receive rights for dest at
- * the time reply was copied-out, so when we pretend
- * that dest is still alive, we can return MACH_PORT_NULL.
- *
- * If dest == reply, then we have to make it look like
- * either both copyouts happened before the port died,
- * or both happened after the port died. This special
- * case works naturally if the timestamp comparison
- * is done correctly.
- */
+ if (IP_VALID(reply)) {
+ ip_release(reply);
+ }
- copyout_dest:
+ if (IP_VALID(release_reply_port)) {
+ if (reply_type == MACH_MSG_TYPE_PORT_SEND_ONCE) {
+ ipc_port_release_sonce(release_reply_port);
+ } else {
+ ipc_port_release_send(release_reply_port);
+ }
+ }
- if (ip_active(dest)) {
- ipc_object_copyout_dest(space, (ipc_object_t) dest,
- dest_type, &dest_name);
- /* dest is unlocked */
- } else {
- ipc_port_timestamp_t timestamp;
+ if ((option & MACH_RCV_VOUCHER) != 0) {
+ KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_MSG_RECV) | DBG_FUNC_NONE,
+ VM_KERNEL_ADDRPERM((uintptr_t)kmsg),
+ (uintptr_t)kmsg->ikm_header->msgh_bits,
+ (uintptr_t)kmsg->ikm_header->msgh_id,
+ VM_KERNEL_ADDRPERM((uintptr_t)unsafe_convert_port_to_voucher(voucher)),
+ 0);
+ } else {
+ KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_MSG_RECV_VOUCHER_REFUSED) | DBG_FUNC_NONE,
+ VM_KERNEL_ADDRPERM((uintptr_t)kmsg),
+ (uintptr_t)kmsg->ikm_header->msgh_bits,
+ (uintptr_t)kmsg->ikm_header->msgh_id,
+ VM_KERNEL_ADDRPERM((uintptr_t)unsafe_convert_port_to_voucher(voucher)),
+ 0);
+ }
- timestamp = dest->ip_timestamp;
- ip_release(dest);
- ip_check_unlock(dest);
+ if (IP_VALID(release_voucher_port)) {
+ ipc_port_release_send(release_voucher_port);
+ }
- if (IP_VALID(reply)) {
- ip_lock(reply);
- if (ip_active(reply) ||
- IP_TIMESTAMP_ORDER(timestamp,
- reply->ip_timestamp))
- dest_name = MACH_PORT_DEAD;
- else
- dest_name = MACH_PORT_NULL;
- ip_unlock(reply);
- } else
- dest_name = MACH_PORT_DEAD;
+ msg->msgh_bits = MACH_MSGH_BITS_SET(reply_type, dest_type,
+ voucher_type, mbits);
+ msg->msgh_local_port = CAST_MACH_NAME_TO_PORT(dest_name);
+ msg->msgh_remote_port = CAST_MACH_NAME_TO_PORT(reply_name);
+ msg->msgh_voucher_port = voucher_name;
}
- if (IP_VALID(reply))
- ipc_port_release(reply);
-
- msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
- MACH_MSGH_BITS(reply_type, dest_type));
- msg->msgh_local_port = (ipc_port_t)dest_name;
- msg->msgh_remote_port = (ipc_port_t)reply_name;
- }
-
return MACH_MSG_SUCCESS;
}
mach_msg_return_t
ipc_kmsg_copyout_object(
- ipc_space_t space,
- ipc_object_t object,
- mach_msg_type_name_t msgt_name,
- mach_port_name_t *namep)
+ ipc_space_t space,
+ ipc_object_t object,
+ mach_msg_type_name_t msgt_name,
+ mach_port_context_t *context,
+ mach_msg_guard_flags_t *guard_flags,
+ mach_port_name_t *namep)
{
kern_return_t kr;
if (!IO_VALID(object)) {
- *namep = (mach_port_name_t) object;
+ *namep = CAST_MACH_PORT_TO_NAME(object);
return MACH_MSG_SUCCESS;
}
- kr = ipc_object_copyout(space, object, msgt_name, TRUE, namep);
- if (kr != KERN_SUCCESS) {
- ipc_object_destroy(object, msgt_name);
+ kr = ipc_object_copyout(space, object, msgt_name, context, guard_flags, namep);
+ if (kr != KERN_SUCCESS) {
+ ipc_object_destroy(object, msgt_name);
+
+ if (kr == KERN_INVALID_CAPABILITY) {
+ *namep = MACH_PORT_DEAD;
+ } else {
+ *namep = MACH_PORT_NULL;
+
+ if (kr == KERN_RESOURCE_SHORTAGE) {
+ return MACH_MSG_IPC_KERNEL;
+ } else {
+ return MACH_MSG_IPC_SPACE;
+ }
+ }
+ }
+
+ return MACH_MSG_SUCCESS;
+}
+
+static mach_msg_descriptor_t *
+ipc_kmsg_copyout_port_descriptor(mach_msg_descriptor_t *dsc,
+ mach_msg_descriptor_t *dest_dsc,
+ ipc_space_t space,
+ kern_return_t *mr)
+{
+ mach_port_t port;
+ mach_port_name_t name;
+ mach_msg_type_name_t disp;
+
+ /* Copyout port right carried in the message */
+ port = dsc->port.name;
+ disp = dsc->port.disposition;
+ *mr |= ipc_kmsg_copyout_object(space,
+ ip_to_object(port), disp, NULL, NULL, &name);
+
+ if (current_task() == kernel_task) {
+ mach_msg_port_descriptor_t *user_dsc = (typeof(user_dsc))dest_dsc;
+ user_dsc--; // point to the start of this port descriptor
+ bzero((void *)user_dsc, sizeof(*user_dsc));
+ user_dsc->name = CAST_MACH_NAME_TO_PORT(name);
+ user_dsc->disposition = disp;
+ user_dsc->type = MACH_MSG_PORT_DESCRIPTOR;
+ dest_dsc = (typeof(dest_dsc))user_dsc;
+ } else {
+ mach_msg_legacy_port_descriptor_t *user_dsc = (typeof(user_dsc))dest_dsc;
+ user_dsc--; // point to the start of this port descriptor
+ bzero((void *)user_dsc, sizeof(*user_dsc));
+ user_dsc->name = CAST_MACH_PORT_TO_NAME(name);
+ user_dsc->disposition = disp;
+ user_dsc->type = MACH_MSG_PORT_DESCRIPTOR;
+ dest_dsc = (typeof(dest_dsc))user_dsc;
+ }
+
+ return (mach_msg_descriptor_t *)dest_dsc;
+}
+
+mach_msg_descriptor_t *
+ipc_kmsg_copyout_ool_descriptor(mach_msg_ool_descriptor_t *dsc, mach_msg_descriptor_t *user_dsc, int is_64bit, vm_map_t map, mach_msg_return_t *mr);
+mach_msg_descriptor_t *
+ipc_kmsg_copyout_ool_descriptor(mach_msg_ool_descriptor_t *dsc, mach_msg_descriptor_t *user_dsc, int is_64bit, vm_map_t map, mach_msg_return_t *mr)
+{
+ vm_map_copy_t copy;
+ vm_map_address_t rcv_addr;
+ mach_msg_copy_options_t copy_options;
+ vm_map_size_t size;
+ mach_msg_descriptor_type_t dsc_type;
+
+ //SKIP_PORT_DESCRIPTORS(saddr, sdsc_count);
+
+ copy = (vm_map_copy_t)dsc->address;
+ size = (vm_map_size_t)dsc->size;
+ copy_options = dsc->copy;
+ assert(copy_options != MACH_MSG_KALLOC_COPY_T);
+ dsc_type = dsc->type;
+
+ if (copy != VM_MAP_COPY_NULL) {
+ kern_return_t kr;
+
+ rcv_addr = 0;
+ if (vm_map_copy_validate_size(map, copy, &size) == FALSE) {
+ panic("Inconsistent OOL/copyout size on %p: expected %d, got %lld @%p",
+ dsc, dsc->size, (unsigned long long)copy->size, copy);
+ }
+ kr = vm_map_copyout_size(map, &rcv_addr, copy, size);
+ if (kr != KERN_SUCCESS) {
+ if (kr == KERN_RESOURCE_SHORTAGE) {
+ *mr |= MACH_MSG_VM_KERNEL;
+ } else {
+ *mr |= MACH_MSG_VM_SPACE;
+ }
+ vm_map_copy_discard(copy);
+ rcv_addr = 0;
+ size = 0;
+ }
+ } else {
+ rcv_addr = 0;
+ size = 0;
+ }
+
+ /*
+ * Now update the descriptor as the user would see it.
+ * This may require expanding the descriptor to the user
+ * visible size. There is already space allocated for
+ * this in what naddr points to.
+ */
+ if (current_task() == kernel_task) {
+ mach_msg_ool_descriptor_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+ user_ool_dsc--;
+ bzero((void *)user_ool_dsc, sizeof(*user_ool_dsc));
+
+ user_ool_dsc->address = (void *)(uintptr_t)rcv_addr;
+ user_ool_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
+ TRUE : FALSE;
+ user_ool_dsc->copy = copy_options;
+ user_ool_dsc->type = dsc_type;
+ user_ool_dsc->size = (mach_msg_size_t)size;
+
+ user_dsc = (typeof(user_dsc))user_ool_dsc;
+ } else if (is_64bit) {
+ mach_msg_ool_descriptor64_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+ user_ool_dsc--;
+ bzero((void *)user_ool_dsc, sizeof(*user_ool_dsc));
+
+ user_ool_dsc->address = rcv_addr;
+ user_ool_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
+ TRUE : FALSE;
+ user_ool_dsc->copy = copy_options;
+ user_ool_dsc->type = dsc_type;
+ user_ool_dsc->size = (mach_msg_size_t)size;
+
+ user_dsc = (typeof(user_dsc))user_ool_dsc;
+ } else {
+ mach_msg_ool_descriptor32_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+ user_ool_dsc--;
+ bzero((void *)user_ool_dsc, sizeof(*user_ool_dsc));
+
+ user_ool_dsc->address = CAST_DOWN_EXPLICIT(uint32_t, rcv_addr);
+ user_ool_dsc->size = (mach_msg_size_t)size;
+ user_ool_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
+ TRUE : FALSE;
+ user_ool_dsc->copy = copy_options;
+ user_ool_dsc->type = dsc_type;
+
+ user_dsc = (typeof(user_dsc))user_ool_dsc;
+ }
+ return user_dsc;
+}
+
+mach_msg_descriptor_t *
+ipc_kmsg_copyout_ool_ports_descriptor(mach_msg_ool_ports_descriptor_t *dsc,
+ mach_msg_descriptor_t *user_dsc,
+ int is_64bit,
+ vm_map_t map,
+ ipc_space_t space,
+ ipc_kmsg_t kmsg,
+ mach_msg_return_t *mr);
+mach_msg_descriptor_t *
+ipc_kmsg_copyout_ool_ports_descriptor(mach_msg_ool_ports_descriptor_t *dsc,
+ mach_msg_descriptor_t *user_dsc,
+ int is_64bit,
+ vm_map_t map,
+ ipc_space_t space,
+ ipc_kmsg_t kmsg,
+ mach_msg_return_t *mr)
+{
+ mach_vm_offset_t rcv_addr = 0;
+ mach_msg_type_name_t disp;
+ mach_msg_type_number_t count, i;
+ vm_size_t ports_length, names_length;
+
+ mach_msg_copy_options_t copy_options = MACH_MSG_VIRTUAL_COPY;
+
+ //SKIP_PORT_DESCRIPTORS(saddr, sdsc_count);
+
+ count = dsc->count;
+ disp = dsc->disposition;
+ ports_length = count * sizeof(mach_port_t);
+ names_length = count * sizeof(mach_port_name_t);
+
+ if (ports_length != 0 && dsc->address != 0) {
+ /*
+ * Check to see if there is an overwrite descriptor
+ * specified in the scatter list for this ool data.
+ * The descriptor has already been verified.
+ */
+#if 0
+ if (saddr != MACH_MSG_DESCRIPTOR_NULL) {
+ if (differs) {
+ OTHER_OOL_DESCRIPTOR *scatter_dsc;
+
+ scatter_dsc = (OTHER_OOL_DESCRIPTOR *)saddr;
+ rcv_addr = (mach_vm_offset_t) scatter_dsc->address;
+ copy_options = scatter_dsc->copy;
+ } else {
+ mach_msg_ool_descriptor_t *scatter_dsc;
+
+ scatter_dsc = &saddr->out_of_line;
+ rcv_addr = CAST_USER_ADDR_T(scatter_dsc->address);
+ copy_options = scatter_dsc->copy;
+ }
+ INCREMENT_SCATTER(saddr, sdsc_count, differs);
+ }
+#endif
+
+ if (copy_options == MACH_MSG_VIRTUAL_COPY) {
+ /*
+ * Dynamically allocate the region
+ */
+ vm_tag_t tag;
+ if (vm_kernel_map_is_kernel(map)) {
+ tag = VM_KERN_MEMORY_IPC;
+ } else {
+ tag = VM_MEMORY_MACH_MSG;
+ }
+
+ kern_return_t kr;
+ if ((kr = mach_vm_allocate_kernel(map, &rcv_addr,
+ (mach_vm_size_t)names_length,
+ VM_FLAGS_ANYWHERE, tag)) != KERN_SUCCESS) {
+ ipc_kmsg_clean_body(kmsg, 1, (mach_msg_descriptor_t *)dsc);
+ rcv_addr = 0;
+
+ if (kr == KERN_RESOURCE_SHORTAGE) {
+ *mr |= MACH_MSG_VM_KERNEL;
+ } else {
+ *mr |= MACH_MSG_VM_SPACE;
+ }
+ }
+ }
+
+ /*
+ * Handle the port rights and copy out the names
+ * for those rights out to user-space.
+ */
+ if (rcv_addr != 0) {
+ ipc_object_t *objects = (ipc_object_t *) dsc->address;
+ mach_port_name_t *names = (mach_port_name_t *) dsc->address;
+
+ /* copyout port rights carried in the message */
+
+ for (i = 0; i < count; i++) {
+ ipc_object_t object = objects[i];
+
+ *mr |= ipc_kmsg_copyout_object(space, object,
+ disp, NULL, NULL, &names[i]);
+ }
+
+ /* copyout to memory allocated above */
+ void *data = dsc->address;
+ if (copyoutmap(map, data, rcv_addr, names_length) != KERN_SUCCESS) {
+ *mr |= MACH_MSG_VM_SPACE;
+ }
+ kfree(data, ports_length);
+ }
+ } else {
+ rcv_addr = 0;
+ }
- if (kr == KERN_INVALID_CAPABILITY)
- *namep = MACH_PORT_DEAD;
- else {
- *namep = MACH_PORT_NULL;
+ /*
+ * Now update the descriptor based on the information
+ * calculated above.
+ */
+ if (current_task() == kernel_task) {
+ mach_msg_ool_ports_descriptor_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+ user_ool_dsc--;
+ bzero((void *)user_ool_dsc, sizeof(*user_ool_dsc));
+
+ user_ool_dsc->address = (void *)(uintptr_t)rcv_addr;
+ user_ool_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
+ TRUE : FALSE;
+ user_ool_dsc->copy = copy_options;
+ user_ool_dsc->disposition = disp;
+ user_ool_dsc->type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
+ user_ool_dsc->count = count;
+
+ user_dsc = (typeof(user_dsc))user_ool_dsc;
+ } else if (is_64bit) {
+ mach_msg_ool_ports_descriptor64_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+ user_ool_dsc--;
+ bzero((void *)user_ool_dsc, sizeof(*user_ool_dsc));
+
+ user_ool_dsc->address = rcv_addr;
+ user_ool_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
+ TRUE : FALSE;
+ user_ool_dsc->copy = copy_options;
+ user_ool_dsc->disposition = disp;
+ user_ool_dsc->type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
+ user_ool_dsc->count = count;
+
+ user_dsc = (typeof(user_dsc))user_ool_dsc;
+ } else {
+ mach_msg_ool_ports_descriptor32_t *user_ool_dsc = (typeof(user_ool_dsc))user_dsc;
+ user_ool_dsc--;
+ bzero((void *)user_ool_dsc, sizeof(*user_ool_dsc));
+
+ user_ool_dsc->address = CAST_DOWN_EXPLICIT(uint32_t, rcv_addr);
+ user_ool_dsc->count = count;
+ user_ool_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
+ TRUE : FALSE;
+ user_ool_dsc->copy = copy_options;
+ user_ool_dsc->disposition = disp;
+ user_ool_dsc->type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
+
+ user_dsc = (typeof(user_dsc))user_ool_dsc;
+ }
+ return user_dsc;
+}
- if (kr == KERN_RESOURCE_SHORTAGE)
- return MACH_MSG_IPC_KERNEL;
- else
- return MACH_MSG_IPC_SPACE;
+static mach_msg_descriptor_t *
+ipc_kmsg_copyout_guarded_port_descriptor(
+ mach_msg_guarded_port_descriptor_t *dsc,
+ mach_msg_descriptor_t *dest_dsc,
+ int is_64bit,
+ __unused ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ mach_msg_option_t option,
+ kern_return_t *mr)
+{
+ mach_port_t port;
+ mach_port_name_t name = MACH_PORT_NULL;
+ mach_msg_type_name_t disp;
+ mach_msg_guard_flags_t guard_flags;
+ mach_port_context_t context;
+
+ /* Copyout port right carried in the message */
+ port = dsc->name;
+ disp = dsc->disposition;
+ guard_flags = dsc->flags;
+ context = 0;
+
+ /* Currently kernel_task doesnt support receiving guarded port descriptors */
+ struct knote *kn = current_thread()->ith_knote;
+ if ((kn != ITH_KNOTE_PSEUDO) && (((option & MACH_RCV_GUARDED_DESC) == 0) ||
+ (current_task() == kernel_task))) {
+#if DEVELOPMENT || DEBUG
+ if (current_task() != kernel_task) {
+ /*
+ * Simulated crash needed for debugging, notifies the receiver to opt into receiving
+ * guarded descriptors.
+ */
+ mach_port_guard_exception(current_thread()->ith_receiver_name, 0, 0, kGUARD_EXC_RCV_GUARDED_DESC);
+ }
+#endif
+ KDBG(MACHDBG_CODE(DBG_MACH_IPC, MACH_IPC_DESTROY_GUARDED_DESC), current_thread()->ith_receiver_name,
+ VM_KERNEL_ADDRPERM(port), disp, guard_flags);
+ ipc_object_destroy(ip_to_object(port), disp);
+ mach_msg_legacy_port_descriptor_t *user_dsc = (typeof(user_dsc))dest_dsc;
+ user_dsc--; // point to the start of this port descriptor
+ bzero((void *)user_dsc, sizeof(*user_dsc));
+ user_dsc->name = name;
+ user_dsc->disposition = disp;
+ user_dsc->type = MACH_MSG_PORT_DESCRIPTOR;
+ dest_dsc = (typeof(dest_dsc))user_dsc;
+ } else {
+ *mr |= ipc_kmsg_copyout_object(space,
+ ip_to_object(port), disp, &context, &guard_flags, &name);
+
+ if (!is_64bit) {
+ mach_msg_guarded_port_descriptor32_t *user_dsc = (typeof(user_dsc))dest_dsc;
+ user_dsc--; // point to the start of this port descriptor
+ bzero((void *)user_dsc, sizeof(*user_dsc));
+ user_dsc->name = name;
+ user_dsc->flags = guard_flags;
+ user_dsc->disposition = disp;
+ user_dsc->type = MACH_MSG_GUARDED_PORT_DESCRIPTOR;
+ user_dsc->context = CAST_DOWN_EXPLICIT(uint32_t, context);
+ dest_dsc = (typeof(dest_dsc))user_dsc;
+ } else {
+ mach_msg_guarded_port_descriptor64_t *user_dsc = (typeof(user_dsc))dest_dsc;
+ user_dsc--; // point to the start of this port descriptor
+ bzero((void *)user_dsc, sizeof(*user_dsc));
+ user_dsc->name = name;
+ user_dsc->flags = guard_flags;
+ user_dsc->disposition = disp;
+ user_dsc->type = MACH_MSG_GUARDED_PORT_DESCRIPTOR;
+ user_dsc->context = context;
+ dest_dsc = (typeof(dest_dsc))user_dsc;
}
}
- return MACH_MSG_SUCCESS;
+ return (mach_msg_descriptor_t *)dest_dsc;
}
/*
mach_msg_return_t
ipc_kmsg_copyout_body(
- ipc_kmsg_t kmsg,
- ipc_space_t space,
- vm_map_t map,
- mach_msg_body_t *slist)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ vm_map_t map,
+ mach_msg_option_t option,
+ mach_msg_body_t *slist)
{
- mach_msg_body_t *body;
- mach_msg_descriptor_t *daddr, *naddr;
- mach_msg_descriptor_t *saddr;
- mach_msg_type_number_t i, dsc_count, sdsc_count;
- mach_msg_return_t mr = MACH_MSG_SUCCESS;
- kern_return_t kr;
- void *data;
- boolean_t differs = MAP_SIZE_DIFFERS(map);
-
- body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
- dsc_count = body->msgh_descriptor_count;
- daddr = (mach_msg_descriptor_t *) (body + 1);
-
- /*
- * Do scatter list setup
- */
- if (slist != MACH_MSG_BODY_NULL) {
- saddr = (mach_msg_descriptor_t *) (slist + 1);
- sdsc_count = slist->msgh_descriptor_count;
- }
- else {
- saddr = MACH_MSG_DESCRIPTOR_NULL;
- sdsc_count = 0;
- }
-
- /*
- * Compute the true size of the resulting descriptors
- * after potential expansion and adjust the header
- * and body location accordingly.
- */
- if (differs) {
- mach_msg_size_t dsc_adjust;
-
- naddr = daddr;
- dsc_adjust = 0;
- for (i = 0; i < dsc_count; i++, naddr++)
- switch (naddr->type.type) {
- case MACH_MSG_OOL_DESCRIPTOR:
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_PORTS_DESCRIPTOR:
- dsc_adjust += DESC_SIZE_ADJUSTMENT;
- break;
- default:
- break;
- }
- if (dsc_adjust) {
- mach_msg_base_t *old_base = (mach_msg_base_t *)kmsg->ikm_header;
- mach_msg_base_t *new_base;
-
- new_base = (mach_msg_base_t *)((vm_offset_t)old_base - dsc_adjust);
- memmove(new_base, old_base, sizeof(mach_msg_base_t));
- kmsg->ikm_header = &new_base->header;
- kmsg->ikm_header->msgh_size += dsc_adjust;
- naddr = (mach_msg_descriptor_t *)(new_base + 1);
+ mach_msg_body_t *body;
+ mach_msg_descriptor_t *kern_dsc, *user_dsc;
+ mach_msg_descriptor_t *saddr;
+ mach_msg_type_number_t dsc_count, sdsc_count;
+ int i;
+ mach_msg_return_t mr = MACH_MSG_SUCCESS;
+ boolean_t is_task_64bit = (map->max_offset > VM_MAX_ADDRESS);
+
+ body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
+ dsc_count = body->msgh_descriptor_count;
+ kern_dsc = (mach_msg_descriptor_t *) (body + 1);
+ /* Point user_dsc just after the end of all the descriptors */
+ user_dsc = &kern_dsc[dsc_count];
+
+ /* Do scatter list setup */
+ if (slist != MACH_MSG_BODY_NULL) {
+ panic("Scatter lists disabled");
+ saddr = (mach_msg_descriptor_t *) (slist + 1);
+ sdsc_count = slist->msgh_descriptor_count;
} else {
- naddr = daddr;
- }
- } else {
- naddr = daddr;
- }
-
- /*
- * Now process the descriptors
- */
- for ( i = 0; i < dsc_count; i++, daddr++ ) {
- switch (daddr->type.type) {
-
- case MACH_MSG_PORT_DESCRIPTOR: {
- volatile mach_msg_port_descriptor_t *dsc;
- volatile mach_msg_port_descriptor_t *user_dsc;
- mach_port_t port;
- mach_port_name_t name;
- mach_msg_type_name_t disp;
-
- /*
- * Copyout port right carried in the message
- */
- dsc = &daddr->port;
- user_dsc = &naddr->port;
- port = dsc->name;
- disp = dsc->disposition;
- mr |= ipc_kmsg_copyout_object(space,
- (ipc_object_t)port,
- disp,
- &name);
- user_dsc->name = (mach_port_t)name;
- user_dsc->disposition = disp;
- user_dsc->type = MACH_MSG_PORT_DESCRIPTOR;
- naddr++;
- break;
- }
-
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_DESCRIPTOR : {
- vm_map_copy_t copy;
- mach_vm_offset_t rcv_addr;
- mach_msg_ool_descriptor_t *dsc;
- mach_msg_copy_options_t copy_options;
- mach_msg_size_t size;
- mach_msg_descriptor_type_t dsc_type;
-
- SKIP_PORT_DESCRIPTORS(saddr, sdsc_count);
-
- dsc = &daddr->out_of_line;
- copy = (vm_map_copy_t) dsc->address;
- size = dsc->size;
- copy_options = dsc->copy;
- assert(copy_options != MACH_MSG_KALLOC_COPY_T);
- dsc_type = dsc->type;
-
- if (copy != VM_MAP_COPY_NULL) {
- /*
- * Check to see if there is an overwrite descriptor
- * specified in the scatter list for this ool data.
- * The descriptor has already been verified.
- */
- if (saddr != MACH_MSG_DESCRIPTOR_NULL) {
- if (differs) {
- OTHER_OOL_DESCRIPTOR *scatter_dsc;
-
- scatter_dsc = (OTHER_OOL_DESCRIPTOR *)saddr;
- if (scatter_dsc->copy == MACH_MSG_OVERWRITE) {
- rcv_addr = (mach_vm_offset_t) scatter_dsc->address;
- copy_options = MACH_MSG_OVERWRITE;
- } else {
- rcv_addr = 0;
- copy_options = MACH_MSG_VIRTUAL_COPY;
- }
- } else {
- mach_msg_ool_descriptor_t *scatter_dsc;
-
- scatter_dsc = &saddr->out_of_line;
- if (scatter_dsc->copy == MACH_MSG_OVERWRITE) {
- rcv_addr = CAST_USER_ADDR_T(scatter_dsc->address);
- copy_options = MACH_MSG_OVERWRITE;
- } else {
- rcv_addr = 0;
- copy_options = MACH_MSG_VIRTUAL_COPY;
- }
- }
- INCREMENT_SCATTER(saddr, sdsc_count, differs);
- }
-
-
- /*
- * Whether the data was virtually or physically
- * copied we have a vm_map_copy_t for it.
- * If there's an overwrite region specified
- * overwrite it, otherwise do a virtual copy out.
- */
- if (copy_options == MACH_MSG_OVERWRITE) {
- kr = vm_map_copy_overwrite(map, rcv_addr,
- copy, TRUE);
- } else {
- kr = vm_map_copyout(map, &rcv_addr, copy);
- }
- if (kr != KERN_SUCCESS) {
- if (kr == KERN_RESOURCE_SHORTAGE)
- mr |= MACH_MSG_VM_KERNEL;
- else
- mr |= MACH_MSG_VM_SPACE;
- vm_map_copy_discard(copy);
- rcv_addr = 0;
- size = 0;
- }
- } else {
- rcv_addr = 0;
- size = 0;
- }
+ saddr = MACH_MSG_DESCRIPTOR_NULL;
+ sdsc_count = 0;
+ }
- /*
- * Now update the descriptor as the user would see it.
- * This may require expanding the descriptor to the user
- * visible size. There is already space allocated for
- * this in what naddr points to.
- */
- if (differs) {
- volatile OTHER_OOL_DESCRIPTOR *user_dsc;
-
- user_dsc = (OTHER_OOL_DESCRIPTOR *)naddr;
- user_dsc->address = rcv_addr;
- user_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
- TRUE : FALSE;
- user_dsc->copy = copy_options;
- user_dsc->type = dsc_type;
- user_dsc->size = size;
- naddr = (mach_msg_descriptor_t *)((OTHER_OOL_DESCRIPTOR *)naddr + 1);
- } else {
- volatile mach_msg_ool_descriptor_t *user_dsc;
-
- user_dsc = &naddr->out_of_line;
- user_dsc->address = CAST_DOWN(void *, rcv_addr);
- user_dsc->size = size;
- user_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
- TRUE : FALSE;
- user_dsc->copy = copy_options;
- user_dsc->type = dsc_type;
- naddr++;
+ /* Now process the descriptors */
+ for (i = dsc_count - 1; i >= 0; i--) {
+ switch (kern_dsc[i].type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR:
+ user_dsc = ipc_kmsg_copyout_port_descriptor(&kern_dsc[i], user_dsc, space, &mr);
+ break;
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR:
+ user_dsc = ipc_kmsg_copyout_ool_descriptor(
+ (mach_msg_ool_descriptor_t *)&kern_dsc[i], user_dsc, is_task_64bit, map, &mr);
+ break;
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR:
+ user_dsc = ipc_kmsg_copyout_ool_ports_descriptor(
+ (mach_msg_ool_ports_descriptor_t *)&kern_dsc[i], user_dsc, is_task_64bit, map, space, kmsg, &mr);
+ break;
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ user_dsc = ipc_kmsg_copyout_guarded_port_descriptor(
+ (mach_msg_guarded_port_descriptor_t *)&kern_dsc[i], user_dsc, is_task_64bit, kmsg, space, option, &mr);
+ break;
+ default: {
+ panic("untyped IPC copyout body: invalid message descriptor");
}
- break;
- }
-
- case MACH_MSG_OOL_PORTS_DESCRIPTOR : {
- mach_vm_offset_t rcv_addr;
- mach_port_name_t *objects;
- mach_msg_type_name_t disp;
- mach_msg_type_number_t count, j;
- vm_size_t length;
-
- volatile mach_msg_ool_ports_descriptor_t *dsc;
- mach_msg_copy_options_t copy_options = MACH_MSG_VIRTUAL_COPY;
-
- SKIP_PORT_DESCRIPTORS(saddr, sdsc_count);
-
- dsc = &daddr->ool_ports;
- count = dsc->count;
- disp = dsc->disposition;
- length = count * sizeof(mach_port_name_t);
-
- if (length != 0 && dsc->address != 0) {
-
- /*
- * Check to see if there is an overwrite descriptor
- * specified in the scatter list for this ool data.
- * The descriptor has already been verified.
- */
- if (saddr != MACH_MSG_DESCRIPTOR_NULL) {
- if (differs) {
- OTHER_OOL_DESCRIPTOR *scatter_dsc;
-
- scatter_dsc = (OTHER_OOL_DESCRIPTOR *)saddr;
- rcv_addr = (mach_vm_offset_t) scatter_dsc->address;
- copy_options = scatter_dsc->copy;
- } else {
- mach_msg_ool_descriptor_t *scatter_dsc;
-
- scatter_dsc = &saddr->out_of_line;
- rcv_addr = CAST_USER_ADDR_T(scatter_dsc->address);
- copy_options = scatter_dsc->copy;
- }
- INCREMENT_SCATTER(saddr, sdsc_count, differs);
- }
-
- if (copy_options == MACH_MSG_VIRTUAL_COPY) {
- /*
- * Dynamically allocate the region
- */
- int anywhere = VM_MAKE_TAG(VM_MEMORY_MACH_MSG)|
- VM_FLAGS_ANYWHERE;
-
- if ((kr = mach_vm_allocate(map, &rcv_addr,
- (mach_vm_size_t)length,
- anywhere)) != KERN_SUCCESS) {
- ipc_kmsg_clean_body(kmsg, 1, daddr);
- rcv_addr = 0;
-
- if (kr == KERN_RESOURCE_SHORTAGE){
- mr |= MACH_MSG_VM_KERNEL;
- } else {
- mr |= MACH_MSG_VM_SPACE;
- }
- }
- }
-
-
- /*
- * Handle the port rights and copy out the names
- * for those rights out to user-space.
- */
- if (rcv_addr != 0) {
- objects = (mach_port_name_t *) dsc->address ;
-
- /* copyout port rights carried in the message */
-
- for ( j = 0; j < count ; j++) {
- ipc_object_t object =
- (ipc_object_t) objects[j];
-
- mr |= ipc_kmsg_copyout_object(space, object,
- disp, &objects[j]);
- }
-
- /* copyout to memory allocated above */
- data = dsc->address;
- if (copyoutmap(map, data, rcv_addr, length) != KERN_SUCCESS)
- mr |= MACH_MSG_VM_SPACE;
- kfree(data, length);
- }
- } else {
- rcv_addr = 0;
}
+ }
- /*
- * Now update the descriptor based on the information
- * calculated above.
- */
- if (differs) {
- volatile OTHER_OOL_PORTS_DESCRIPTOR *user_dsc;
-
- user_dsc = (OTHER_OOL_PORTS_DESCRIPTOR *)naddr;
- user_dsc->address = rcv_addr;
- user_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
- TRUE : FALSE;
- user_dsc->copy = copy_options;
- user_dsc->disposition = disp;
- user_dsc->type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
- user_dsc->count = count;
- naddr = (mach_msg_descriptor_t *)((OTHER_OOL_PORTS_DESCRIPTOR *)naddr + 1);
- } else {
- volatile mach_msg_ool_ports_descriptor_t *user_dsc;
-
- user_dsc = &naddr->ool_ports;
- user_dsc->address = CAST_DOWN(void *, rcv_addr);
- user_dsc->count = count;
- user_dsc->deallocate = (copy_options == MACH_MSG_VIRTUAL_COPY) ?
- TRUE : FALSE;
- user_dsc->copy = copy_options;
- user_dsc->disposition = disp;
- user_dsc->type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
- naddr++;
- }
- break;
- }
- default : {
- panic("untyped IPC copyout body: invalid message descriptor");
- }
+ if (user_dsc != kern_dsc) {
+ vm_offset_t dsc_adjust = (vm_offset_t)user_dsc - (vm_offset_t)kern_dsc;
+ memmove((char *)((vm_offset_t)kmsg->ikm_header + dsc_adjust), kmsg->ikm_header, sizeof(mach_msg_base_t));
+ kmsg->ikm_header = (mach_msg_header_t *)((vm_offset_t)kmsg->ikm_header + dsc_adjust);
+ /* Update the message size for the smaller user representation */
+ kmsg->ikm_header->msgh_size -= (mach_msg_size_t)dsc_adjust;
}
- }
- return mr;
+
+ return mr;
}
/*
mach_msg_size_t
ipc_kmsg_copyout_size(
- ipc_kmsg_t kmsg,
- vm_map_t map)
+ ipc_kmsg_t kmsg,
+ vm_map_t map)
{
- mach_msg_size_t send_size;
+ mach_msg_size_t send_size;
send_size = kmsg->ikm_header->msgh_size;
- if ((kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
- MAP_SIZE_DIFFERS(map)) {
+ boolean_t is_task_64bit = (map->max_offset > VM_MAX_ADDRESS);
+
+#if defined(__LP64__)
+ send_size -= LEGACY_HEADER_SIZE_DELTA;
+#endif
+ if (kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) {
mach_msg_body_t *body;
mach_msg_descriptor_t *saddr, *eaddr;
body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
saddr = (mach_msg_descriptor_t *) (body + 1);
eaddr = saddr + body->msgh_descriptor_count;
-
- for ( ; saddr < eaddr; saddr++ ) {
- switch (saddr->type.type) {
+ for (; saddr < eaddr; saddr++) {
+ switch (saddr->type.type) {
case MACH_MSG_OOL_DESCRIPTOR:
case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
case MACH_MSG_OOL_PORTS_DESCRIPTOR:
- send_size += DESC_SIZE_ADJUSTMENT;
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR:
+ if (!is_task_64bit) {
+ send_size -= DESC_SIZE_ADJUSTMENT;
+ }
+ break;
+ case MACH_MSG_PORT_DESCRIPTOR:
+ send_size -= DESC_SIZE_ADJUSTMENT;
break;
-
default:
break;
}
* Nothing locked.
* Returns:
* MACH_MSG_SUCCESS Copied out all rights and memory.
- * MACH_RCV_INVALID_NOTIFY Bad notify port.
- * Rights and memory in the message are intact.
* MACH_RCV_HEADER_ERROR + special bits
* Rights and memory in the message are intact.
* MACH_RCV_BODY_ERROR + special bits
mach_msg_return_t
ipc_kmsg_copyout(
- ipc_kmsg_t kmsg,
- ipc_space_t space,
- vm_map_t map,
- mach_port_name_t notify,
- mach_msg_body_t *slist)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ vm_map_t map,
+ mach_msg_body_t *slist,
+ mach_msg_option_t option)
{
mach_msg_return_t mr;
- mr = ipc_kmsg_copyout_header(kmsg->ikm_header, space, notify);
- if (mr != MACH_MSG_SUCCESS)
+ mr = ipc_kmsg_copyout_header(kmsg, space, option);
+ if (mr != MACH_MSG_SUCCESS) {
return mr;
+ }
if (kmsg->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) {
- mr = ipc_kmsg_copyout_body(kmsg, space, map, slist);
+ mr = ipc_kmsg_copyout_body(kmsg, space, map, option, slist);
- if (mr != MACH_MSG_SUCCESS)
+ if (mr != MACH_MSG_SUCCESS) {
mr |= MACH_RCV_BODY_ERROR;
+ }
}
return mr;
mach_msg_return_t
ipc_kmsg_copyout_pseudo(
- ipc_kmsg_t kmsg,
- ipc_space_t space,
- vm_map_t map,
- mach_msg_body_t *slist)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space,
+ vm_map_t map,
+ mach_msg_body_t *slist)
{
mach_msg_bits_t mbits = kmsg->ikm_header->msgh_bits;
- ipc_object_t dest = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
- ipc_object_t reply = (ipc_object_t) kmsg->ikm_header->msgh_local_port;
+ ipc_object_t dest = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ ipc_object_t reply = ip_to_object(kmsg->ikm_header->msgh_local_port);
+ ipc_object_t voucher = ip_to_object(kmsg->ikm_voucher);
mach_msg_type_name_t dest_type = MACH_MSGH_BITS_REMOTE(mbits);
mach_msg_type_name_t reply_type = MACH_MSGH_BITS_LOCAL(mbits);
+ mach_msg_type_name_t voucher_type = MACH_MSGH_BITS_VOUCHER(mbits);
+ mach_port_name_t voucher_name = kmsg->ikm_header->msgh_voucher_port;
mach_port_name_t dest_name, reply_name;
mach_msg_return_t mr;
+ /* Set ith_knote to ITH_KNOTE_PSEUDO */
+ current_thread()->ith_knote = ITH_KNOTE_PSEUDO;
+
assert(IO_VALID(dest));
- mr = (ipc_kmsg_copyout_object(space, dest, dest_type, &dest_name) |
- ipc_kmsg_copyout_object(space, reply, reply_type, &reply_name));
+#if 0
+ /*
+ * If we did this here, it looks like we wouldn't need the undo logic
+ * at the end of ipc_kmsg_send() in the error cases. Not sure which
+ * would be more elegant to keep.
+ */
+ ipc_importance_clean(kmsg);
+#else
+ /* just assert it is already clean */
+ ipc_importance_assert_clean(kmsg);
+#endif
+
+ mr = (ipc_kmsg_copyout_object(space, dest, dest_type, NULL, NULL, &dest_name) |
+ ipc_kmsg_copyout_object(space, reply, reply_type, NULL, NULL, &reply_name));
- kmsg->ikm_header->msgh_bits = mbits &~ MACH_MSGH_BITS_CIRCULAR;
- kmsg->ikm_header->msgh_remote_port = (ipc_port_t)dest_name;
- kmsg->ikm_header->msgh_local_port = (ipc_port_t)reply_name;
+ kmsg->ikm_header->msgh_bits = mbits & MACH_MSGH_BITS_USER;
+ kmsg->ikm_header->msgh_remote_port = CAST_MACH_NAME_TO_PORT(dest_name);
+ kmsg->ikm_header->msgh_local_port = CAST_MACH_NAME_TO_PORT(reply_name);
+
+ if (IO_VALID(voucher)) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
+
+ kmsg->ikm_voucher = IP_NULL;
+ mr |= ipc_kmsg_copyout_object(space, voucher, voucher_type, NULL, NULL, &voucher_name);
+ kmsg->ikm_header->msgh_voucher_port = voucher_name;
+ }
if (mbits & MACH_MSGH_BITS_COMPLEX) {
- mr |= ipc_kmsg_copyout_body(kmsg, space, map, slist);
+ mr |= ipc_kmsg_copyout_body(kmsg, space, map, 0, slist);
}
return mr;
void
ipc_kmsg_copyout_dest(
- ipc_kmsg_t kmsg,
- ipc_space_t space)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space)
{
mach_msg_bits_t mbits;
ipc_object_t dest;
ipc_object_t reply;
+ ipc_object_t voucher;
mach_msg_type_name_t dest_type;
mach_msg_type_name_t reply_type;
- mach_port_name_t dest_name, reply_name;
+ mach_msg_type_name_t voucher_type;
+ mach_port_name_t dest_name, reply_name, voucher_name;
mbits = kmsg->ikm_header->msgh_bits;
- dest = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
- reply = (ipc_object_t) kmsg->ikm_header->msgh_local_port;
+ dest = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ reply = ip_to_object(kmsg->ikm_header->msgh_local_port);
+ voucher = ip_to_object(kmsg->ikm_voucher);
+ voucher_name = kmsg->ikm_header->msgh_voucher_port;
dest_type = MACH_MSGH_BITS_REMOTE(mbits);
reply_type = MACH_MSGH_BITS_LOCAL(mbits);
+ voucher_type = MACH_MSGH_BITS_VOUCHER(mbits);
assert(IO_VALID(dest));
+ ipc_importance_assert_clean(kmsg);
+
io_lock(dest);
if (io_active(dest)) {
ipc_object_copyout_dest(space, dest, dest_type, &dest_name);
/* dest is unlocked */
} else {
+ io_unlock(dest);
io_release(dest);
- io_check_unlock(dest);
dest_name = MACH_PORT_DEAD;
}
if (IO_VALID(reply)) {
ipc_object_destroy(reply, reply_type);
reply_name = MACH_PORT_NULL;
- } else
- reply_name = (mach_port_name_t) reply;
+ } else {
+ reply_name = CAST_MACH_PORT_TO_NAME(reply);
+ }
+
+ if (IO_VALID(voucher)) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
- kmsg->ikm_header->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
- MACH_MSGH_BITS(reply_type, dest_type));
- kmsg->ikm_header->msgh_local_port = (ipc_port_t)dest_name;
- kmsg->ikm_header->msgh_remote_port = (ipc_port_t)reply_name;
+ kmsg->ikm_voucher = IP_NULL;
+ ipc_object_destroy(voucher, voucher_type);
+ voucher_name = MACH_PORT_NULL;
+ }
+
+ kmsg->ikm_header->msgh_bits = MACH_MSGH_BITS_SET(reply_type, dest_type,
+ voucher_type, mbits);
+ kmsg->ikm_header->msgh_local_port = CAST_MACH_NAME_TO_PORT(dest_name);
+ kmsg->ikm_header->msgh_remote_port = CAST_MACH_NAME_TO_PORT(reply_name);
+ kmsg->ikm_header->msgh_voucher_port = voucher_name;
if (mbits & MACH_MSGH_BITS_COMPLEX) {
mach_msg_body_t *body;
body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
- ipc_kmsg_clean_body(kmsg, body->msgh_descriptor_count,
- (mach_msg_descriptor_t *)(body + 1));
+ ipc_kmsg_clean_body(kmsg, body->msgh_descriptor_count,
+ (mach_msg_descriptor_t *)(body + 1));
}
}
-/*
- * Routine: ipc_kmsg_copyin_scatter
- * Purpose:
- * allocate and copyin a scatter list
- * Algorithm:
- * The gather (kmsg) is valid since it has been copied in.
- * Gather list descriptors are sequentially paired with scatter
- * list descriptors, with port descriptors in either list ignored.
- * Descriptors are consistent if the type fileds match and size
- * of the scatter descriptor is less than or equal to the
- * size of the gather descriptor. A MACH_MSG_ALLOCATE copy
- * strategy in a scatter descriptor matches any size in the
- * corresponding gather descriptor assuming they are the same type.
- * Either list may be larger than the other. During the
- * subsequent copy out, excess scatter descriptors are ignored
- * and excess gather descriptors default to dynamic allocation.
- *
- * In the case of a size error, the scatter list is released.
- * Conditions:
- * Nothing locked.
- * Returns:
- * the allocated message body containing the scatter list.
- */
-
-mach_msg_body_t *
-ipc_kmsg_get_scatter(
- mach_vm_address_t msg_addr,
- mach_msg_size_t slist_size,
- ipc_kmsg_t kmsg)
-{
- mach_msg_body_t *slist;
- mach_msg_body_t *body;
- mach_msg_descriptor_t *gstart, *gend;
- mach_msg_descriptor_t *sstart, *send;
-
-
- if (slist_size < sizeof(mach_msg_base_t))
- return MACH_MSG_BODY_NULL;
-
- slist_size -= sizeof(mach_msg_header_t);
- slist = (mach_msg_body_t *)kalloc(slist_size);
- if (slist == MACH_MSG_BODY_NULL)
- return slist;
-
- if (copyin(msg_addr + sizeof(mach_msg_header_t), (char *)slist, slist_size)) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
-
- if ((slist->msgh_descriptor_count* sizeof(mach_msg_descriptor_t)
- + sizeof(mach_msg_size_t)) > slist_size) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
-
- body = (mach_msg_body_t *) (kmsg->ikm_header + 1);
- gstart = (mach_msg_descriptor_t *) (body + 1);
- gend = gstart + body->msgh_descriptor_count;
-
- sstart = (mach_msg_descriptor_t *) (slist + 1);
- send = sstart + slist->msgh_descriptor_count;
-
- while (gstart < gend) {
- mach_msg_descriptor_type_t g_type;
-
- /*
- * Skip port descriptors in gather list.
- */
- g_type = gstart->type.type;
-
- if (g_type != MACH_MSG_PORT_DESCRIPTOR) {
-
- /*
- * A scatter list with a 0 descriptor count is treated as an
- * automatic size mismatch.
- */
- if (slist->msgh_descriptor_count == 0) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
-
- /*
- * Skip port descriptors in scatter list.
- */
- while (sstart < send) {
- if (sstart->type.type != MACH_MSG_PORT_DESCRIPTOR)
- break;
- sstart++;
- }
-
- /*
- * No more scatter descriptors, we're done
- */
- if (sstart >= send) {
- break;
- }
-
- /*
- * Check type, copy and size fields
- */
- if (g_type == MACH_MSG_OOL_DESCRIPTOR ||
- g_type == MACH_MSG_OOL_VOLATILE_DESCRIPTOR) {
- if (sstart->type.type != MACH_MSG_OOL_DESCRIPTOR &&
- sstart->type.type != MACH_MSG_OOL_VOLATILE_DESCRIPTOR) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
- if (sstart->out_of_line.copy == MACH_MSG_OVERWRITE &&
- gstart->out_of_line.size > sstart->out_of_line.size) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
- }
- else {
- if (sstart->type.type != MACH_MSG_OOL_PORTS_DESCRIPTOR) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
- if (sstart->ool_ports.copy == MACH_MSG_OVERWRITE &&
- gstart->ool_ports.count > sstart->ool_ports.count) {
- kfree(slist, slist_size);
- return MACH_MSG_BODY_NULL;
- }
- }
- sstart++;
- }
- gstart++;
- }
- return slist;
-}
-
-
-/*
- * Routine: ipc_kmsg_free_scatter
- * Purpose:
- * Deallocate a scatter list. Since we actually allocated
- * a body without a header, and since the header was originally
- * accounted for in slist_size, we have to ajust it down
- * before freeing the scatter list.
- */
-void
-ipc_kmsg_free_scatter(
- mach_msg_body_t *slist,
- mach_msg_size_t slist_size)
-{
- slist_size -= sizeof(mach_msg_header_t);
- kfree(slist, slist_size);
-}
-
-
/*
* Routine: ipc_kmsg_copyout_to_kernel
* Purpose:
void
ipc_kmsg_copyout_to_kernel(
- ipc_kmsg_t kmsg,
- ipc_space_t space)
+ ipc_kmsg_t kmsg,
+ ipc_space_t space)
{
ipc_object_t dest;
- ipc_object_t reply;
+ mach_port_t reply;
mach_msg_type_name_t dest_type;
mach_msg_type_name_t reply_type;
- mach_port_name_t dest_name, reply_name;
+ mach_port_name_t dest_name;
- dest = (ipc_object_t) kmsg->ikm_header->msgh_remote_port;
- reply = (ipc_object_t) kmsg->ikm_header->msgh_local_port;
+ dest = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ reply = kmsg->ikm_header->msgh_local_port;
dest_type = MACH_MSGH_BITS_REMOTE(kmsg->ikm_header->msgh_bits);
reply_type = MACH_MSGH_BITS_LOCAL(kmsg->ikm_header->msgh_bits);
ipc_object_copyout_dest(space, dest, dest_type, &dest_name);
/* dest is unlocked */
} else {
+ io_unlock(dest);
io_release(dest);
- io_check_unlock(dest);
dest_name = MACH_PORT_DEAD;
}
- reply_name = (mach_port_name_t) reply;
+ /*
+ * While MIG kernel users don't receive vouchers, the
+ * msgh_voucher_port field is intended to be round-tripped through the
+ * kernel if there is no voucher disposition set. Here we check for a
+ * non-zero voucher disposition, and consume the voucher send right as
+ * there is no possible way to specify MACH_RCV_VOUCHER semantics.
+ */
+ mach_msg_type_name_t voucher_type;
+ voucher_type = MACH_MSGH_BITS_VOUCHER(kmsg->ikm_header->msgh_bits);
+ if (voucher_type != MACH_MSGH_BITS_ZERO) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
+ /*
+ * someone managed to send this kernel routine a message with
+ * a voucher in it. Cleanup the reference in
+ * kmsg->ikm_voucher.
+ */
+ if (IP_VALID(kmsg->ikm_voucher)) {
+ ipc_port_release_send(kmsg->ikm_voucher);
+ }
+ kmsg->ikm_voucher = IP_NULL;
+ kmsg->ikm_header->msgh_voucher_port = 0;
+ }
kmsg->ikm_header->msgh_bits =
- (MACH_MSGH_BITS_OTHER(kmsg->ikm_header->msgh_bits) |
- MACH_MSGH_BITS(reply_type, dest_type));
- kmsg->ikm_header->msgh_local_port = (ipc_port_t)dest_name;
- kmsg->ikm_header->msgh_remote_port = (ipc_port_t)reply_name;
+ (MACH_MSGH_BITS_OTHER(kmsg->ikm_header->msgh_bits) |
+ MACH_MSGH_BITS(reply_type, dest_type));
+ kmsg->ikm_header->msgh_local_port = CAST_MACH_NAME_TO_PORT(dest_name);
+ kmsg->ikm_header->msgh_remote_port = reply;
}
-#include <mach_kdb.h>
-#if MACH_KDB
+#if IKM_SUPPORT_LEGACY
+void
+ipc_kmsg_copyout_to_kernel_legacy(
+ ipc_kmsg_t kmsg,
+ ipc_space_t space)
+{
+ ipc_object_t dest;
+ mach_port_t reply;
+ mach_msg_type_name_t dest_type;
+ mach_msg_type_name_t reply_type;
+ mach_port_name_t dest_name;
-#include <ddb/db_output.h>
-#include <ipc/ipc_print.h>
-/*
- * Forward declarations
- */
-void ipc_msg_print_untyped(
- mach_msg_body_t *body);
+ dest = ip_to_object(kmsg->ikm_header->msgh_remote_port);
+ reply = kmsg->ikm_header->msgh_local_port;
+ dest_type = MACH_MSGH_BITS_REMOTE(kmsg->ikm_header->msgh_bits);
+ reply_type = MACH_MSGH_BITS_LOCAL(kmsg->ikm_header->msgh_bits);
-const char * ipc_type_name(
- int type_name,
- boolean_t received);
+ assert(IO_VALID(dest));
-void ipc_print_type_name(
- int type_name);
+ io_lock(dest);
+ if (io_active(dest)) {
+ ipc_object_copyout_dest(space, dest, dest_type, &dest_name);
+ /* dest is unlocked */
+ } else {
+ io_unlock(dest);
+ io_release(dest);
+ dest_name = MACH_PORT_DEAD;
+ }
-const char *
-msgh_bit_decode(
- mach_msg_bits_t bit);
+ mach_msg_type_name_t voucher_type;
+ voucher_type = MACH_MSGH_BITS_VOUCHER(kmsg->ikm_header->msgh_bits);
+ if (voucher_type != MACH_MSGH_BITS_ZERO) {
+ assert(voucher_type == MACH_MSG_TYPE_MOVE_SEND);
+ assert(IP_VALID(kmsg->ikm_voucher));
+ /*
+ * someone managed to send this kernel routine a message with
+ * a voucher in it. Cleanup the reference in
+ * kmsg->ikm_voucher.
+ */
+ ipc_port_release_send(kmsg->ikm_voucher);
+ kmsg->ikm_voucher = IP_NULL;
+ kmsg->ikm_header->msgh_voucher_port = 0;
+ }
-const char *
-mm_copy_options_string(
- mach_msg_copy_options_t option);
+ kmsg->ikm_header->msgh_bits =
+ (MACH_MSGH_BITS_OTHER(kmsg->ikm_header->msgh_bits) |
+ MACH_MSGH_BITS(reply_type, dest_type));
+ kmsg->ikm_header->msgh_local_port = CAST_MACH_NAME_TO_PORT(dest_name);
+ kmsg->ikm_header->msgh_remote_port = reply;
+
+ mach_msg_descriptor_t *saddr;
+ mach_msg_legacy_descriptor_t *daddr;
+ mach_msg_type_number_t i, count = ((mach_msg_base_t *)kmsg->ikm_header)->body.msgh_descriptor_count;
+ saddr = (mach_msg_descriptor_t *) (((mach_msg_base_t *)kmsg->ikm_header) + 1);
+ saddr = &saddr[count - 1];
+ daddr = (mach_msg_legacy_descriptor_t *)&saddr[count];
+ daddr--;
+
+ vm_offset_t dsc_adjust = 0;
+
+ for (i = 0; i < count; i++, saddr--, daddr--) {
+ switch (saddr->type.type) {
+ case MACH_MSG_PORT_DESCRIPTOR: {
+ mach_msg_port_descriptor_t *dsc = &saddr->port;
+ mach_msg_legacy_port_descriptor_t *dest_dsc = &daddr->port;
+
+ mach_port_t name = dsc->name;
+ mach_msg_type_name_t disposition = dsc->disposition;
+
+ dest_dsc->name = CAST_MACH_PORT_TO_NAME(name);
+ dest_dsc->disposition = disposition;
+ dest_dsc->type = MACH_MSG_PORT_DESCRIPTOR;
+ break;
+ }
+ case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
+ case MACH_MSG_OOL_DESCRIPTOR: {
+ /* The sender should supply ready-made memory, i.e. a vm_map_copy_t
+ * so we don't need to do anything special. */
-void db_print_msg_uid(mach_msg_header_t *);
+ mach_msg_ool_descriptor_t *source_dsc = (typeof(source_dsc)) & saddr->out_of_line;
+ mach_msg_ool_descriptor32_t *dest_dsc = &daddr->out_of_line32;
-const char *
-ipc_type_name(
- int type_name,
- boolean_t received)
-{
- switch (type_name) {
- case MACH_MSG_TYPE_PORT_NAME:
- return "port_name";
-
- case MACH_MSG_TYPE_MOVE_RECEIVE:
- if (received) {
- return "port_receive";
- } else {
- return "move_receive";
+ vm_offset_t address = (vm_offset_t)source_dsc->address;
+ vm_size_t size = source_dsc->size;
+ boolean_t deallocate = source_dsc->deallocate;
+ mach_msg_copy_options_t copy = source_dsc->copy;
+ mach_msg_descriptor_type_t type = source_dsc->type;
+
+ dest_dsc->address = address;
+ dest_dsc->size = size;
+ dest_dsc->deallocate = deallocate;
+ dest_dsc->copy = copy;
+ dest_dsc->type = type;
+ break;
}
-
- case MACH_MSG_TYPE_MOVE_SEND:
- if (received) {
- return "port_send";
- } else {
- return "move_send";
+ case MACH_MSG_OOL_PORTS_DESCRIPTOR: {
+ mach_msg_ool_ports_descriptor_t *source_dsc = (typeof(source_dsc)) & saddr->ool_ports;
+
+ mach_msg_ool_ports_descriptor32_t *dest_dsc = &daddr->ool_ports32;
+
+ vm_offset_t address = (vm_offset_t)source_dsc->address;
+ vm_size_t port_count = source_dsc->count;
+ boolean_t deallocate = source_dsc->deallocate;
+ mach_msg_copy_options_t copy = source_dsc->copy;
+ mach_msg_descriptor_type_t type = source_dsc->type;
+
+ dest_dsc->address = address;
+ dest_dsc->count = port_count;
+ dest_dsc->deallocate = deallocate;
+ dest_dsc->copy = copy;
+ dest_dsc->type = type;
+ break;
+ }
+ case MACH_MSG_GUARDED_PORT_DESCRIPTOR: {
+ mach_msg_guarded_port_descriptor_t *source_dsc = (typeof(source_dsc)) & saddr->guarded_port;
+ mach_msg_guarded_port_descriptor32_t *dest_dsc = &daddr->guarded_port32;
+
+ dest_dsc->name = CAST_MACH_PORT_TO_NAME(source_dsc->name);
+ dest_dsc->disposition = source_dsc->disposition;
+ dest_dsc->flags = 0;
+ dest_dsc->type = MACH_MSG_GUARDED_PORT_DESCRIPTOR;
+ dest_dsc->context = 0;
+ break;
+ }
+ default: {
+#if MACH_ASSERT
+ panic("ipc_kmsg_copyout_to_kernel_legacy: bad descriptor");
+#endif /* MACH_ASSERT */
}
-
- case MACH_MSG_TYPE_MOVE_SEND_ONCE:
- if (received) {
- return "port_send_once";
- } else {
- return "move_send_once";
}
-
- case MACH_MSG_TYPE_COPY_SEND:
- return "copy_send";
-
- case MACH_MSG_TYPE_MAKE_SEND:
- return "make_send";
-
- case MACH_MSG_TYPE_MAKE_SEND_ONCE:
- return "make_send_once";
-
- default:
- return (char *) 0;
}
-}
-
-void
-ipc_print_type_name(
- int type_name)
-{
- const char *name = ipc_type_name(type_name, TRUE);
- if (name) {
- printf("%s", name);
- } else {
- printf("type%d", type_name);
+
+ if (count) {
+ dsc_adjust = 4 * count;
+ memmove((char *)((vm_offset_t)kmsg->ikm_header + dsc_adjust), kmsg->ikm_header, sizeof(mach_msg_base_t));
+ kmsg->ikm_header = (mach_msg_header_t *)((vm_offset_t)kmsg->ikm_header + dsc_adjust);
+ /* Update the message size for the smaller user representation */
+ kmsg->ikm_header->msgh_size -= dsc_adjust;
}
}
+#endif /* IKM_SUPPORT_LEGACY */
+#ifdef __arm64__
/*
- * ipc_kmsg_print [ debug ]
+ * Just sets those parts of the trailer that aren't set up at allocation time.
*/
-void
-ipc_kmsg_print(
- ipc_kmsg_t kmsg)
-{
- iprintf("kmsg=0x%x\n", kmsg);
- iprintf("ikm_next=0x%x, prev=0x%x, size=%d",
- kmsg->ikm_next,
- kmsg->ikm_prev,
- kmsg->ikm_size);
- printf("\n");
- ipc_msg_print(kmsg->ikm_header);
-}
-
-const char *
-msgh_bit_decode(
- mach_msg_bits_t bit)
+static void
+ipc_kmsg_munge_trailer(mach_msg_max_trailer_t *in, void *_out, boolean_t is64bit)
{
- switch (bit) {
- case MACH_MSGH_BITS_COMPLEX: return "complex";
- case MACH_MSGH_BITS_CIRCULAR: return "circular";
- default: return (char *) 0;
+ if (is64bit) {
+ mach_msg_max_trailer64_t *out = (mach_msg_max_trailer64_t*)_out;
+ out->msgh_seqno = in->msgh_seqno;
+ out->msgh_context = in->msgh_context;
+ out->msgh_trailer_size = in->msgh_trailer_size;
+ out->msgh_ad = in->msgh_ad;
+ } else {
+ mach_msg_max_trailer32_t *out = (mach_msg_max_trailer32_t*)_out;
+ out->msgh_seqno = in->msgh_seqno;
+ out->msgh_context = (mach_port_context32_t)in->msgh_context;
+ out->msgh_trailer_size = in->msgh_trailer_size;
+ out->msgh_ad = in->msgh_ad;
}
}
+#endif /* __arm64__ */
-/*
- * ipc_msg_print [ debug ]
- */
-void
-ipc_msg_print(
- mach_msg_header_t *msgh)
+mach_msg_trailer_size_t
+ipc_kmsg_add_trailer(ipc_kmsg_t kmsg, ipc_space_t space __unused,
+ mach_msg_option_t option, thread_t thread,
+ mach_port_seqno_t seqno, boolean_t minimal_trailer,
+ mach_vm_offset_t context)
{
- mach_msg_bits_t mbits;
- unsigned int bit, i;
- const char *bit_name;
- int needs_comma;
+ mach_msg_max_trailer_t *trailer;
- mbits = msgh->msgh_bits;
- iprintf("msgh_bits=0x%x: l=0x%x,r=0x%x\n",
- mbits,
- MACH_MSGH_BITS_LOCAL(msgh->msgh_bits),
- MACH_MSGH_BITS_REMOTE(msgh->msgh_bits));
+#ifdef __arm64__
+ mach_msg_max_trailer_t tmp_trailer; /* This accommodates U64, and we'll munge */
+ void *real_trailer_out = (void*)(mach_msg_max_trailer_t *)
+ ((vm_offset_t)kmsg->ikm_header +
+ round_msg(kmsg->ikm_header->msgh_size));
- mbits = MACH_MSGH_BITS_OTHER(mbits) & MACH_MSGH_BITS_USED;
- db_indent += 2;
- if (mbits)
- iprintf("decoded bits: ");
- needs_comma = 0;
- for (i = 0, bit = 1; i < sizeof(mbits) * 8; ++i, bit <<= 1) {
- if ((mbits & bit) == 0)
- continue;
- bit_name = msgh_bit_decode((mach_msg_bits_t)bit);
- if (bit_name)
- printf("%s%s", needs_comma ? "," : "", bit_name);
- else
- printf("%sunknown(0x%x),", needs_comma ? "," : "", bit);
- ++needs_comma;
- }
- if (msgh->msgh_bits & ~MACH_MSGH_BITS_USED) {
- printf("%sunused=0x%x,", needs_comma ? "," : "",
- msgh->msgh_bits & ~MACH_MSGH_BITS_USED);
+ /*
+ * Populate scratch with initial values set up at message allocation time.
+ * After, we reinterpret the space in the message as the right type
+ * of trailer for the address space in question.
+ */
+ bcopy(real_trailer_out, &tmp_trailer, MAX_TRAILER_SIZE);
+ trailer = &tmp_trailer;
+#else /* __arm64__ */
+ (void)thread;
+ trailer = (mach_msg_max_trailer_t *)
+ ((vm_offset_t)kmsg->ikm_header +
+ round_msg(kmsg->ikm_header->msgh_size));
+#endif /* __arm64__ */
+
+ if (!(option & MACH_RCV_TRAILER_MASK)) {
+ return trailer->msgh_trailer_size;
}
- printf("\n");
- db_indent -= 2;
- needs_comma = 1;
- if (msgh->msgh_remote_port) {
- iprintf("remote=0x%x(", msgh->msgh_remote_port);
- ipc_print_type_name(MACH_MSGH_BITS_REMOTE(msgh->msgh_bits));
- printf(")");
- } else {
- iprintf("remote=null");
+ trailer->msgh_seqno = seqno;
+ trailer->msgh_context = context;
+ trailer->msgh_trailer_size = REQUESTED_TRAILER_SIZE(thread_is_64bit_addr(thread), option);
+
+ if (minimal_trailer) {
+ goto done;
}
- if (msgh->msgh_local_port) {
- printf("%slocal=0x%x(", needs_comma ? "," : "",
- msgh->msgh_local_port);
- ipc_print_type_name(MACH_MSGH_BITS_LOCAL(msgh->msgh_bits));
- printf(")\n");
- } else {
- printf("local=null\n");
+ if (GET_RCV_ELEMENTS(option) >= MACH_RCV_TRAILER_AV) {
+ trailer->msgh_ad = 0;
}
- iprintf("msgh_id=%d, size=%d\n",
- msgh->msgh_id,
- msgh->msgh_size);
+ /*
+ * The ipc_kmsg_t holds a reference to the label of a label
+ * handle, not the port. We must get a reference to the port
+ * and a send right to copyout to the receiver.
+ */
- if (mbits & MACH_MSGH_BITS_COMPLEX) {
- ipc_msg_print_untyped((mach_msg_body_t *) (msgh + 1));
+ if (option & MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_LABELS)) {
+ trailer->msgh_labels.sender = 0;
}
-}
+done:
+#ifdef __arm64__
+ ipc_kmsg_munge_trailer(trailer, real_trailer_out, thread_is_64bit_addr(thread));
+#endif /* __arm64__ */
-const char *
-mm_copy_options_string(
- mach_msg_copy_options_t option)
-{
- const char *name;
-
- switch (option) {
- case MACH_MSG_PHYSICAL_COPY:
- name = "PHYSICAL";
- break;
- case MACH_MSG_VIRTUAL_COPY:
- name = "VIRTUAL";
- break;
- case MACH_MSG_OVERWRITE:
- name = "OVERWRITE";
- break;
- case MACH_MSG_ALLOCATE:
- name = "ALLOCATE";
- break;
- case MACH_MSG_KALLOC_COPY_T:
- name = "KALLOC_COPY_T";
- break;
- default:
- name = "unknown";
- break;
- }
- return name;
+ return trailer->msgh_trailer_size;
}
-void
-ipc_msg_print_untyped(
- mach_msg_body_t *body)
+mach_msg_header_t *
+ipc_kmsg_msg_header(ipc_kmsg_t kmsg)
{
- mach_msg_descriptor_t *saddr, *send;
- mach_msg_descriptor_type_t type;
-
- iprintf("%d descriptors %d: \n", body->msgh_descriptor_count);
-
- saddr = (mach_msg_descriptor_t *) (body + 1);
- send = saddr + body->msgh_descriptor_count;
-
- for ( ; saddr < send; saddr++ ) {
-
- type = saddr->type.type;
-
- switch (type) {
-
- case MACH_MSG_PORT_DESCRIPTOR: {
- mach_msg_port_descriptor_t *dsc;
-
- dsc = &saddr->port;
- iprintf("-- PORT name = 0x%x disp = ", dsc->name);
- ipc_print_type_name(dsc->disposition);
- printf("\n");
- break;
- }
- case MACH_MSG_OOL_VOLATILE_DESCRIPTOR:
- case MACH_MSG_OOL_DESCRIPTOR: {
- mach_msg_ool_descriptor_t *dsc;
-
- dsc = &saddr->out_of_line;
- iprintf("-- OOL%s addr = 0x%x size = 0x%x copy = %s %s\n",
- type == MACH_MSG_OOL_DESCRIPTOR ? "" : " VOLATILE",
- dsc->address, dsc->size,
- mm_copy_options_string(dsc->copy),
- dsc->deallocate ? "DEALLOC" : "");
- break;
- }
- case MACH_MSG_OOL_PORTS_DESCRIPTOR : {
- mach_msg_ool_ports_descriptor_t *dsc;
-
- dsc = &saddr->ool_ports;
-
- iprintf("-- OOL_PORTS addr = 0x%x count = 0x%x ",
- dsc->address, dsc->count);
- printf("disp = ");
- ipc_print_type_name(dsc->disposition);
- printf(" copy = %s %s\n",
- mm_copy_options_string(dsc->copy),
- dsc->deallocate ? "DEALLOC" : "");
- break;
- }
-
- default: {
- iprintf("-- UNKNOWN DESCRIPTOR 0x%x\n", type);
- break;
- }
+ if (NULL == kmsg) {
+ return NULL;
}
- }
+ return kmsg->ikm_header;
}
-#endif /* MACH_KDB */
projects / apple / xnu.git / blobdiff