* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_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
* 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.
- *
+ *
* 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,
* 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_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.
*/
* Definitions for IPC objects, for which tasks have capabilities.
*/
-#ifndef _IPC_IPC_OBJECT_H_
+#ifndef _IPC_IPC_OBJECT_H_
#define _IPC_IPC_OBJECT_H_
-#include <mach_rt.h>
-#include <mach_kdb.h>
-
#include <mach/kern_return.h>
#include <mach/message.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
#include <kern/macro_help.h>
+#include <kern/assert.h>
#include <kern/zalloc.h>
#include <ipc/ipc_types.h>
+#include <libkern/OSAtomic.h>
-typedef natural_t ipc_object_refs_t; /* for ipc/ipc_object.h */
+typedef natural_t ipc_object_refs_t; /* for ipc/ipc_object.h */
typedef natural_t ipc_object_bits_t;
typedef natural_t ipc_object_type_t;
* structures, and (Noto Bene!) pointers to either of these or the
* ipc_object at the head of these are freely cast back and forth; hence
* the ipc_object MUST BE FIRST in the ipc_common_data.
- *
+ *
* If the RPC implementation enabled user-mode code to use kernel-level
* data structures (as ours used to), this peculiar structuring would
* avoid having anything in user code depend on the kernel configuration
struct ipc_object {
ipc_object_bits_t io_bits;
ipc_object_refs_t io_references;
- decl_lck_mtx_data(, io_lock_data)
+ lck_spin_t io_lock_data;
};
/*
/*
* Legacy defines. Should use IPC_OBJECT_NULL, etc...
*/
-#define IO_NULL ((ipc_object_t) 0)
-#define IO_DEAD ((ipc_object_t) ~0UL)
-#define IO_VALID(io) (((io) != IO_NULL) && ((io) != IO_DEAD))
+#define IO_NULL ((ipc_object_t) 0)
+#define IO_DEAD ((ipc_object_t) ~0UL)
+#define IO_VALID(io) (((io) != IO_NULL) && ((io) != IO_DEAD))
/*
* IPC steals the high-order bits from the kotype to use
* to IO_BITS_PORT_INFO must be coordinated with bitfield
* definitions in ipc_port.h.
*/
-#define IO_BITS_PORT_INFO 0x0000f000 /* stupid port tricks */
-#define IO_BITS_KOTYPE 0x00000fff /* used by the object */
-#define IO_BITS_OTYPE 0x7fff0000 /* determines a zone */
-#define IO_BITS_ACTIVE 0x80000000 /* is object alive? */
+#define IO_BITS_PORT_INFO 0x0000f000 /* stupid port tricks */
+#define IO_BITS_KOTYPE 0x00000fff /* used by the object */
+#define IO_BITS_OTYPE 0x7fff0000 /* determines a zone */
+#define IO_BITS_ACTIVE 0x80000000 /* is object alive? */
-#define io_active(io) ((io)->io_bits & IO_BITS_ACTIVE)
+#define io_active(io) (((io)->io_bits & IO_BITS_ACTIVE) != 0)
-#define io_otype(io) (((io)->io_bits & IO_BITS_OTYPE) >> 16)
-#define io_kotype(io) ((io)->io_bits & IO_BITS_KOTYPE)
+#define io_otype(io) (((io)->io_bits & IO_BITS_OTYPE) >> 16)
+#define io_kotype(io) ((io)->io_bits & IO_BITS_KOTYPE)
-#define io_makebits(active, otype, kotype) \
+#define io_makebits(active, otype, kotype) \
(((active) ? IO_BITS_ACTIVE : 0) | ((otype) << 16) | (kotype))
/*
* Object types: ports, port sets, kernel-loaded ports
*/
-#define IOT_PORT 0
-#define IOT_PORT_SET 1
-#define IOT_NUMBER 2 /* number of types used */
+#define IOT_PORT 0
+#define IOT_PORT_SET 1
+#define IOT_NUMBER 2 /* number of types used */
extern zone_t ipc_object_zones[IOT_NUMBER];
-#define io_alloc(otype) \
- ((ipc_object_t) zalloc(ipc_object_zones[(otype)]))
+#define io_alloc(otype) \
+ ((ipc_object_t) zalloc(ipc_object_zones[(otype)]))
-extern void io_free(
- unsigned int otype,
- ipc_object_t object);
+extern void io_free(
+ unsigned int otype,
+ ipc_object_t object);
/*
* Here we depend on the ipc_object being first within the kernel struct
* (ipc_port and ipc_pset).
*/
#define io_lock_init(io) \
- lck_mtx_init(&(io)->io_lock_data, &ipc_lck_grp, &ipc_lck_attr)
+ lck_spin_init(&(io)->io_lock_data, &ipc_lck_grp, &ipc_lck_attr)
#define io_lock_destroy(io) \
- lck_mtx_destroy(&(io)->io_lock_data, &ipc_lck_grp)
-#define io_lock(io) \
- lck_mtx_lock(&(io)->io_lock_data)
-#define io_lock_try(io) \
- lck_mtx_try_lock(&(io)->io_lock_data)
-#define io_unlock(io) \
- lck_mtx_unlock(&(io)->io_lock_data)
+ lck_spin_destroy(&(io)->io_lock_data, &ipc_lck_grp)
+#define io_lock(io) \
+ lck_spin_lock_grp(&(io)->io_lock_data, &ipc_lck_grp)
+#define io_lock_try(io) \
+ lck_spin_try_lock_grp(&(io)->io_lock_data, &ipc_lck_grp)
+#define io_lock_held_kdp(io) \
+ kdp_lck_spin_is_acquired(&(io)->io_lock_data)
+#define io_unlock(io) \
+ lck_spin_unlock(&(io)->io_lock_data)
#define _VOLATILE_ volatile
-#define io_check_unlock(io) \
-MACRO_BEGIN \
- _VOLATILE_ ipc_object_refs_t _refs = (io)->io_references; \
- \
- io_unlock(io); \
- if (_refs == 0) \
- io_free(io_otype(io), io); \
-MACRO_END
-
/* Sanity check the ref count. If it is 0, we may be doubly zfreeing.
- * If it is larger than max int, it has been corrupted, probably by being
- * modified into an address (this is architecture dependent, but it's
- * safe to assume there cannot really be max int references).
+ * If it is larger than max int, it has been corrupted or leaked,
+ * probably by being modified into an address (this is architecture
+ * dependent, but it's safe to assume there cannot really be max int
+ * references unless some code is leaking the io_reference without leaking
+ * object). Saturate the io_reference on release kernel if it reaches
+ * max int to avoid use after free.
*
* NOTE: The 0 test alone will not catch double zfreeing of ipc_port
* structs, because the io_references field is the first word of the struct,
* and zfree modifies that to point to the next free zone element.
*/
-#define IO_MAX_REFERENCES \
+#define IO_MAX_REFERENCES \
(unsigned)(~0 ^ (1 << (sizeof(int)*BYTE_SIZE - 1)))
-#define io_reference(io) \
-MACRO_BEGIN \
- assert((io)->io_references < IO_MAX_REFERENCES); \
- (io)->io_references++; \
-MACRO_END
-
-#define io_release(io) \
-MACRO_BEGIN \
- assert((io)->io_references > 0 && \
- (io)->io_references <= IO_MAX_REFERENCES); \
- (io)->io_references--; \
-MACRO_END
+static inline void
+io_reference(ipc_object_t io)
+{
+ ipc_object_refs_t new_io_references;
+ ipc_object_refs_t old_io_references;
+
+ assert((io)->io_references > 0 &&
+ (io)->io_references < IO_MAX_REFERENCES);
+
+ do {
+ old_io_references = (io)->io_references;
+ new_io_references = old_io_references + 1;
+ if (old_io_references == IO_MAX_REFERENCES) {
+ break;
+ }
+ } while (OSCompareAndSwap(old_io_references, new_io_references,
+ &((io)->io_references)) == FALSE);
+}
+
+
+static inline void
+io_release(ipc_object_t io)
+{
+ ipc_object_refs_t new_io_references;
+ ipc_object_refs_t old_io_references;
+
+ assert((io)->io_references > 0 &&
+ (io)->io_references < IO_MAX_REFERENCES);
+
+ do {
+ old_io_references = (io)->io_references;
+ new_io_references = old_io_references - 1;
+ if (old_io_references == IO_MAX_REFERENCES) {
+ break;
+ }
+ } while (OSCompareAndSwap(old_io_references, new_io_references,
+ &((io)->io_references)) == FALSE);
+
+ /* If we just removed the last reference count */
+ if (1 == old_io_references) {
+ /* Free the object */
+ io_free(io_otype((io)), (io));
+ }
+}
-/*
+/*
* Retrieve a label for use in a kernel call that takes a security
* label as a parameter. If necessary, io_getlabel acquires internal
* (not io_lock) locks, and io_unlocklabel releases them.
*/
struct label;
-extern struct label *io_getlabel (ipc_object_t obj);
+extern struct label *io_getlabel(ipc_object_t obj);
#define io_unlocklabel(obj)
/*
/* Take a reference to an object */
extern void ipc_object_reference(
- ipc_object_t object);
+ ipc_object_t object);
/* Release a reference to an object */
extern void ipc_object_release(
- ipc_object_t object);
+ ipc_object_t object);
/* Look up an object in a space */
extern kern_return_t ipc_object_translate(
- ipc_space_t space,
- mach_port_name_t name,
- mach_port_right_t right,
- ipc_object_t *objectp);
+ ipc_space_t space,
+ mach_port_name_t name,
+ mach_port_right_t right,
+ ipc_object_t *objectp);
/* Look up two objects in a space, locking them in the order described */
extern kern_return_t ipc_object_translate_two(
- ipc_space_t space,
- mach_port_name_t name1,
- mach_port_right_t right1,
- ipc_object_t *objectp1,
- mach_port_name_t name2,
- mach_port_right_t right2,
- ipc_object_t *objectp2);
+ ipc_space_t space,
+ mach_port_name_t name1,
+ mach_port_right_t right1,
+ ipc_object_t *objectp1,
+ mach_port_name_t name2,
+ mach_port_right_t right2,
+ ipc_object_t *objectp2);
/* Allocate a dead-name entry */
extern kern_return_t
ipc_object_alloc_dead(
- ipc_space_t space,
- mach_port_name_t *namep);
+ ipc_space_t space,
+ mach_port_name_t *namep);
/* Allocate a dead-name entry, with a specific name */
extern kern_return_t ipc_object_alloc_dead_name(
- ipc_space_t space,
- mach_port_name_t name);
+ ipc_space_t space,
+ mach_port_name_t name);
/* Allocate an object */
extern kern_return_t ipc_object_alloc(
- ipc_space_t space,
- ipc_object_type_t otype,
- mach_port_type_t type,
- mach_port_urefs_t urefs,
- mach_port_name_t *namep,
- ipc_object_t *objectp);
+ ipc_space_t space,
+ ipc_object_type_t otype,
+ mach_port_type_t type,
+ mach_port_urefs_t urefs,
+ mach_port_name_t *namep,
+ ipc_object_t *objectp);
/* Allocate an object, with a specific name */
extern kern_return_t ipc_object_alloc_name(
- ipc_space_t space,
- ipc_object_type_t otype,
- mach_port_type_t type,
- mach_port_urefs_t urefs,
- mach_port_name_t name,
- ipc_object_t *objectp);
+ ipc_space_t space,
+ ipc_object_type_t otype,
+ mach_port_type_t type,
+ mach_port_urefs_t urefs,
+ mach_port_name_t name,
+ ipc_object_t *objectp);
/* Convert a send type name to a received type name */
extern mach_msg_type_name_t ipc_object_copyin_type(
- mach_msg_type_name_t msgt_name);
+ mach_msg_type_name_t msgt_name);
/* Copyin a capability from a space */
extern kern_return_t ipc_object_copyin(
- ipc_space_t space,
- mach_port_name_t name,
- mach_msg_type_name_t msgt_name,
- ipc_object_t *objectp);
+ ipc_space_t space,
+ mach_port_name_t name,
+ mach_msg_type_name_t msgt_name,
+ ipc_object_t *objectp);
/* Copyin a naked capability from the kernel */
extern void ipc_object_copyin_from_kernel(
- ipc_object_t object,
- mach_msg_type_name_t msgt_name);
+ ipc_object_t object,
+ mach_msg_type_name_t msgt_name);
/* Destroy a naked capability */
extern void ipc_object_destroy(
- ipc_object_t object,
- mach_msg_type_name_t msgt_name);
+ ipc_object_t object,
+ mach_msg_type_name_t msgt_name);
/* Destroy a naked destination capability */
extern void ipc_object_destroy_dest(
- ipc_object_t object,
- mach_msg_type_name_t msgt_name);
+ ipc_object_t object,
+ mach_msg_type_name_t msgt_name);
/* Copyout a capability, placing it into a space */
extern kern_return_t ipc_object_copyout(
- ipc_space_t space,
- ipc_object_t object,
- mach_msg_type_name_t msgt_name,
- boolean_t overflow,
- mach_port_name_t *namep);
+ ipc_space_t space,
+ ipc_object_t object,
+ mach_msg_type_name_t msgt_name,
+ boolean_t overflow,
+ mach_port_name_t *namep);
/* Copyout a capability with a name, placing it into a space */
extern kern_return_t ipc_object_copyout_name(
- ipc_space_t space,
- ipc_object_t object,
- mach_msg_type_name_t msgt_name,
- boolean_t overflow,
- mach_port_name_t name);
+ ipc_space_t space,
+ ipc_object_t object,
+ mach_msg_type_name_t msgt_name,
+ boolean_t overflow,
+ mach_port_name_t name);
/* Translate/consume the destination right of a message */
extern void ipc_object_copyout_dest(
- 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_name_t *namep);
/* Rename an entry in a space */
extern kern_return_t ipc_object_rename(
- ipc_space_t space,
- mach_port_name_t oname,
- mach_port_name_t nname);
-
-#if MACH_KDB
-/* Pretty-print an ipc object */
-
-extern void ipc_object_print(
- ipc_object_t object);
-
-#endif /* MACH_KDB */
+ ipc_space_t space,
+ mach_port_name_t oname,
+ mach_port_name_t nname);
-#endif /* _IPC_IPC_OBJECT_H_ */
+#endif /* _IPC_IPC_OBJECT_H_ */
projects / apple / xnu.git / blobdiff