xnu-4570.41.2.tar.gz

[apple/xnu.git] / osfmk / kern / ipc_kobject.c

diff --git a/osfmk/kern/ipc_kobject.c b/osfmk/kern/ipc_kobject.c
index 89b8f9e68f807f38fc4984c81dfcafa2ebc14fa9..1acc81c4a3e2bdb262f90d19b02d92c75666bd42 100644 (file)
--- a/osfmk/kern/ipc_kobject.c
+++ b/osfmk/kern/ipc_kobject.c
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -72,11 +72,6 @@
 
 #include <mach_debug.h>
 #include <mach_ipc_test.h>
 
 #include <mach_debug.h>
 #include <mach_ipc_test.h>

-#include <mach_machine_routines.h>
-#include <norma_task.h>
-#include <mach_rt.h>
-#include <platforms.h>
-

 #include <mach/mig.h>
 #include <mach/port.h>
 #include <mach/kern_return.h>
 #include <mach/mig.h>
 #include <mach/port.h>
 #include <mach/kern_return.h>


@@ -94,15 +89,14 @@
 #include <mach/clock_server.h>
 #include <mach/clock_priv_server.h>
 #include <mach/lock_set_server.h>
 #include <mach/clock_server.h>
 #include <mach/clock_priv_server.h>
 #include <mach/lock_set_server.h>

-#include <default_pager/default_pager_object_server.h>
-#include <mach/memory_object_server.h>

 #include <mach/memory_object_control_server.h>
 #include <mach/memory_object_default_server.h>
 #include <mach/memory_object_control_server.h>
 #include <mach/memory_object_default_server.h>

-#include <mach/memory_object_name_server.h>

 #include <mach/processor_server.h>
 #include <mach/processor_set_server.h>
 #include <mach/task_server.h>
 #include <mach/processor_server.h>
 #include <mach/processor_set_server.h>
 #include <mach/task_server.h>

-#if VM32_SUPPORT
+#include <mach/mach_voucher_server.h>
+#include <mach/mach_voucher_attr_control_server.h>
+#ifdef VM32_SUPPORT

 #include <mach/vm32_map_server.h>
 #endif
 #include <mach/thread_act_server.h>
 #include <mach/vm32_map_server.h>
 #endif
 #include <mach/thread_act_server.h>


@@ -132,13 +126,18 @@
 #include <kern/misc_protos.h>
 #include <ipc/ipc_kmsg.h>
 #include <ipc/ipc_port.h>
 #include <kern/misc_protos.h>
 #include <ipc/ipc_kmsg.h>
 #include <ipc/ipc_port.h>

-#include <ipc/ipc_labelh.h>
+#include <ipc/ipc_voucher.h>
+#include <kern/sync_sema.h>

 #include <kern/counters.h>
 #include <kern/counters.h>

+#include <kern/work_interval.h>

 
 #include <vm/vm_protos.h>
 
 #include <security/mac_mach_internal.h>
 
 
 #include <vm/vm_protos.h>
 
 #include <security/mac_mach_internal.h>
 

+extern char *proc_name_address(void *p);
+extern int proc_pid(void *p);
+

 /*
  *     Routine:        ipc_kobject_notify
  *     Purpose:
 /*
  *     Routine:        ipc_kobject_notify
  *     Purpose:


@@ -158,20 +157,16 @@ typedef struct {
 #endif
 } mig_hash_t;
 
 #endif
 } mig_hash_t;
 

-#define MAX_MIG_ENTRIES 1024
+#define MAX_MIG_ENTRIES 1031

 #define MIG_HASH(x) (x)
 
 #ifndef max
 #define max(a,b)        (((a) > (b)) ? (a) : (b))
 #endif /* max */
 
 #define MIG_HASH(x) (x)
 
 #ifndef max
 #define max(a,b)        (((a) > (b)) ? (a) : (b))
 #endif /* max */
 

-mig_hash_t mig_buckets[MAX_MIG_ENTRIES];
-int mig_table_max_displ;
-mach_msg_size_t mig_reply_size;
-
-#if CONFIG_MACF
-#include <mach/security_server.h>
-#endif
+static mig_hash_t mig_buckets[MAX_MIG_ENTRIES];
+static int mig_table_max_displ;
+static mach_msg_size_t mig_reply_size = sizeof(mig_reply_error_t);

 
 
 
 
 
 


@@ -186,15 +181,15 @@ const struct mig_subsystem *mig_e[] = {
         (const struct mig_subsystem *)&processor_subsystem,
         (const struct mig_subsystem *)&processor_set_subsystem,
         (const struct mig_subsystem *)&is_iokit_subsystem,
         (const struct mig_subsystem *)&processor_subsystem,
         (const struct mig_subsystem *)&processor_set_subsystem,
         (const struct mig_subsystem *)&is_iokit_subsystem,

-        (const struct mig_subsystem *)&memory_object_name_subsystem,

        (const struct mig_subsystem *)&lock_set_subsystem,
        (const struct mig_subsystem *)&task_subsystem,
        (const struct mig_subsystem *)&thread_act_subsystem,
        (const struct mig_subsystem *)&lock_set_subsystem,
        (const struct mig_subsystem *)&task_subsystem,
        (const struct mig_subsystem *)&thread_act_subsystem,

-#if VM32_SUPPORT
+#ifdef VM32_SUPPORT

        (const struct mig_subsystem *)&vm32_map_subsystem,
 #endif
        (const struct mig_subsystem *)&UNDReply_subsystem,
        (const struct mig_subsystem *)&vm32_map_subsystem,
 #endif
        (const struct mig_subsystem *)&UNDReply_subsystem,

-       (const struct mig_subsystem *)&default_pager_object_subsystem,
+       (const struct mig_subsystem *)&mach_voucher_subsystem,
+       (const struct mig_subsystem *)&mach_voucher_attr_control_subsystem,

 
 #if     XK_PROXY
         (const struct mig_subsystem *)&do_uproxy_xk_uproxy_subsystem,
 
 #if     XK_PROXY
         (const struct mig_subsystem *)&do_uproxy_xk_uproxy_subsystem,


@@ -205,10 +200,6 @@ const struct mig_subsystem *mig_e[] = {
 #if     MCMSG && iPSC860
        (const struct mig_subsystem *)&mcmsg_info_subsystem,
 #endif  /* MCMSG && iPSC860 */
 #if     MCMSG && iPSC860
        (const struct mig_subsystem *)&mcmsg_info_subsystem,
 #endif  /* MCMSG && iPSC860 */

-
-#if CONFIG_MACF
-       (const struct mig_subsystem *)&security_subsystem,
-#endif

 };
 
 void
 };
 
 void


@@ -222,7 +213,6 @@ mig_init(void)
        range = mig_e[i]->end - mig_e[i]->start;
        if (!mig_e[i]->start || range < 0)
            panic("the msgh_ids in mig_e[] aren't valid!");
        range = mig_e[i]->end - mig_e[i]->start;
        if (!mig_e[i]->start || range < 0)
            panic("the msgh_ids in mig_e[] aren't valid!");

-       mig_reply_size = max(mig_reply_size, mig_e[i]->maxsize);

 
        for  (j = 0; j < range; j++) {
          if (mig_e[i]->routine[j].stub_routine) { 
 
        for  (j = 0; j < range; j++) {
          if (mig_e[i]->routine[j].stub_routine) { 


@@ -266,26 +256,31 @@ mig_init(void)
 
 ipc_kmsg_t
 ipc_kobject_server(
 
 ipc_kmsg_t
 ipc_kobject_server(

-       ipc_kmsg_t      request)
+       ipc_kmsg_t      request,
+       mach_msg_option_t __unused option)

 {
        mach_msg_size_t reply_size;
        ipc_kmsg_t reply;
        kern_return_t kr;
        ipc_port_t *destp;
 {
        mach_msg_size_t reply_size;
        ipc_kmsg_t reply;
        kern_return_t kr;
        ipc_port_t *destp;

+       ipc_port_t  replyp = IPC_PORT_NULL;

        mach_msg_format_0_trailer_t *trailer;
        mach_msg_format_0_trailer_t *trailer;

-       register mig_hash_t *ptr;
+       mig_hash_t *ptr;
+       task_t task = TASK_NULL;
+       uint32_t exec_token;
+       boolean_t exec_token_changed = FALSE;

 
        /*
         * Find out corresponding mig_hash entry if any
         */
        {
 
        /*
         * Find out corresponding mig_hash entry if any
         */
        {

-           register int key = request->ikm_header->msgh_id;
-           register int i = MIG_HASH(key);
-           register int max_iter = mig_table_max_displ;
-       
-           do
+           int key = request->ikm_header->msgh_id;
+           unsigned int i = (unsigned int)MIG_HASH(key);
+           int max_iter = mig_table_max_displ;
+
+           do {

                ptr = &mig_buckets[i++ % MAX_MIG_ENTRIES];
                ptr = &mig_buckets[i++ % MAX_MIG_ENTRIES];

-           while (key != ptr->num && ptr->num && --max_iter);
+           } while (key != ptr->num && ptr->num && --max_iter);

 
            if (!ptr->routine || key != ptr->num) {
                ptr = (mig_hash_t *)0;
 
            if (!ptr->routine || key != ptr->num) {
                ptr = (mig_hash_t *)0;


@@ -304,6 +299,7 @@ ipc_kobject_server(
 
        if (reply == IKM_NULL) {
                printf("ipc_kobject_server: dropping request\n");
 
        if (reply == IKM_NULL) {
                printf("ipc_kobject_server: dropping request\n");

+               ipc_kmsg_trace_send(request, option);

                ipc_kmsg_destroy(request);
                return IKM_NULL;
        }
                ipc_kmsg_destroy(request);
                return IKM_NULL;
        }


@@ -326,10 +322,10 @@ ipc_kobject_server(
            OutP->Head.msgh_size = sizeof(mig_reply_error_t);
 
            OutP->Head.msgh_bits =
            OutP->Head.msgh_size = sizeof(mig_reply_error_t);
 
            OutP->Head.msgh_bits =

-               MACH_MSGH_BITS(MACH_MSGH_BITS_LOCAL(InP->msgh_bits), 0);
+               MACH_MSGH_BITS_SET(MACH_MSGH_BITS_LOCAL(InP->msgh_bits), 0, 0, 0);

            OutP->Head.msgh_remote_port = InP->msgh_local_port;
            OutP->Head.msgh_remote_port = InP->msgh_local_port;

-           OutP->Head.msgh_local_port  = MACH_PORT_NULL;
-           OutP->Head.msgh_reserved = (mach_msg_size_t)InP->msgh_id; /* useful for debug */
+           OutP->Head.msgh_local_port = MACH_PORT_NULL;
+           OutP->Head.msgh_voucher_port = MACH_PORT_NULL;

            OutP->Head.msgh_id = InP->msgh_id + 100;
 
 #undef InP
            OutP->Head.msgh_id = InP->msgh_id + 100;
 
 #undef InP


@@ -340,17 +336,36 @@ ipc_kobject_server(
         * Find the routine to call, and call it
         * to perform the kernel function
         */
         * Find the routine to call, and call it
         * to perform the kernel function
         */

+       ipc_kmsg_trace_send(request, option);

        {
        {

-           if (ptr) {  
+           if (ptr) {
+               /*
+                * Check if the port is a task port, if its a task port then
+                * snapshot the task exec token before the mig routine call.
+                */
+               ipc_port_t port = request->ikm_header->msgh_remote_port;
+               if (IP_VALID(port) && ip_kotype(port) == IKOT_TASK) {
+                       task = convert_port_to_task_with_exec_token(port, &exec_token);
+               }
+

                (*ptr->routine)(request->ikm_header, reply->ikm_header);
                (*ptr->routine)(request->ikm_header, reply->ikm_header);

+
+               /* Check if the exec token changed during the mig routine */
+               if (task != TASK_NULL) {
+                       if (exec_token != task->exec_token) {
+                               exec_token_changed = TRUE;
+                       }
+                       task_deallocate(task);
+               }
+

                kernel_task->messages_received++;
            }
            else {
                if (!ipc_kobject_notify(request->ikm_header, reply->ikm_header)){
                kernel_task->messages_received++;
            }
            else {
                if (!ipc_kobject_notify(request->ikm_header, reply->ikm_header)){

-#if    MACH_IPC_TEST
+#if DEVELOPMENT || DEBUG

                    printf("ipc_kobject_server: bogus kernel message, id=%d\n",
                        request->ikm_header->msgh_id);
                    printf("ipc_kobject_server: bogus kernel message, id=%d\n",
                        request->ikm_header->msgh_id);

-#endif /* MACH_IPC_TEST */
+#endif /* DEVELOPMENT || DEBUG */

                    _MIG_MSGID_INVALID(request->ikm_header->msgh_id);
 
                    ((mig_reply_error_t *) reply->ikm_header)->RetCode
                    _MIG_MSGID_INVALID(request->ikm_header->msgh_id);
 
                    ((mig_reply_error_t *) reply->ikm_header)->RetCode


@@ -388,6 +403,17 @@ ipc_kobject_server(
        }
        *destp = IP_NULL;
 
        }
        *destp = IP_NULL;
 

+       /*
+        *      Destroy voucher.  The kernel MIG servers never take ownership
+        *      of vouchers sent in messages.  Swallow any such rights here.
+        */
+       if (IP_VALID(request->ikm_voucher)) {
+               assert(MACH_MSG_TYPE_PORT_SEND ==
+                      MACH_MSGH_BITS_VOUCHER(request->ikm_header->msgh_bits));
+               ipc_port_release_send(request->ikm_voucher);
+               request->ikm_voucher = IP_NULL;
+       }
+

         if (!(reply->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
            ((mig_reply_error_t *) reply->ikm_header)->RetCode != KERN_SUCCESS)
                kr = ((mig_reply_error_t *) reply->ikm_header)->RetCode;
         if (!(reply->ikm_header->msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
            ((mig_reply_error_t *) reply->ikm_header)->RetCode != KERN_SUCCESS)
                kr = ((mig_reply_error_t *) reply->ikm_header)->RetCode;


@@ -414,6 +440,8 @@ ipc_kobject_server(
                ipc_kmsg_destroy(request);
        }
 
                ipc_kmsg_destroy(request);
        }
 

+       replyp = (ipc_port_t)reply->ikm_header->msgh_remote_port;
+

        if (kr == MIG_NO_REPLY) {
                /*
                 *      The server function will send a reply message
        if (kr == MIG_NO_REPLY) {
                /*
                 *      The server function will send a reply message


@@ -423,7 +451,7 @@ ipc_kobject_server(
                ipc_kmsg_free(reply);
 
                return IKM_NULL;
                ipc_kmsg_free(reply);
 
                return IKM_NULL;

-       } else if (!IP_VALID((ipc_port_t)reply->ikm_header->msgh_remote_port)) {
+       } else if (!IP_VALID(replyp)) {

                /*
                 *      Can't queue the reply message if the destination
                 *      (the reply port) isn't valid.
                /*
                 *      Can't queue the reply message if the destination
                 *      (the reply port) isn't valid.


@@ -432,6 +460,63 @@ ipc_kobject_server(
                ipc_kmsg_destroy(reply);
 
                return IKM_NULL;
                ipc_kmsg_destroy(reply);
 
                return IKM_NULL;

+       } else if (replyp->ip_receiver == ipc_space_kernel) {
+               /*
+                * Don't send replies to kobject kernel ports
+                */
+#if DEVELOPMENT || DEBUG
+               printf("%s: refusing to send reply to kobject %d port (id:%d)\n",
+                      __func__, ip_kotype(replyp),
+                      request->ikm_header->msgh_id);
+#endif /* DEVELOPMENT || DEBUG */
+               ipc_kmsg_destroy(reply);
+               return IKM_NULL;
+       }
+
+       /* Fail the MIG call if the task exec token changed during the call */
+       if (kr == KERN_SUCCESS && exec_token_changed) {
+               /*
+                *      Create a new reply msg with error and destroy the old reply msg.
+                */
+               ipc_kmsg_t new_reply = ipc_kmsg_alloc(reply_size);
+
+               if (new_reply == IKM_NULL) {
+                       printf("ipc_kobject_server: dropping request\n");
+                       ipc_kmsg_destroy(reply);
+                       return IKM_NULL;
+               }
+               /*
+                *      Initialize the new reply message.
+                */
+               {
+#define        OutP_new        ((mig_reply_error_t *) new_reply->ikm_header)
+#define        OutP_old        ((mig_reply_error_t *) reply->ikm_header)
+
+                   bzero((void *)OutP_new, reply_size);
+
+                   OutP_new->NDR = OutP_old->NDR;
+                   OutP_new->Head.msgh_size = sizeof(mig_reply_error_t);
+                   OutP_new->Head.msgh_bits = OutP_old->Head.msgh_bits & ~MACH_MSGH_BITS_COMPLEX;
+                   OutP_new->Head.msgh_remote_port = OutP_old->Head.msgh_remote_port;
+                   OutP_new->Head.msgh_local_port = MACH_PORT_NULL;
+                   OutP_new->Head.msgh_voucher_port = MACH_PORT_NULL;
+                   OutP_new->Head.msgh_id = OutP_old->Head.msgh_id;
+
+                   /* Set the error as KERN_INVALID_TASK */
+                   OutP_new->RetCode = KERN_INVALID_TASK;
+
+#undef OutP_new
+#undef  OutP_old
+               }
+
+               /*
+                *      Destroy everything in reply except the reply port right,
+                *      which is needed in the new reply message.
+                */
+               reply->ikm_header->msgh_remote_port = MACH_PORT_NULL;
+               ipc_kmsg_destroy(reply);
+
+               reply = new_reply;

        }
 
        trailer = (mach_msg_format_0_trailer_t *)
        }
 
        trailer = (mach_msg_format_0_trailer_t *)


@@ -463,11 +548,6 @@ ipc_kobject_set(
 {
        ip_lock(port);
        ipc_kobject_set_atomically(port, kobject, type);
 {
        ip_lock(port);
        ipc_kobject_set_atomically(port, kobject, type);

-
-#if CONFIG_MACF_MACH
-       mac_port_label_update_kobject (&port->ip_label, type);
-#endif
-

        ip_unlock(port);
 }
 
        ip_unlock(port);
 }
 


@@ -517,12 +597,6 @@ ipc_kobject_destroy(
                host_notify_port_destroy(port);
                break;
 
                host_notify_port_destroy(port);
                break;
 

-#if CONFIG_MACF_MACH
-       case IKOT_LABELH:
-               labelh_destroy(port);
-               break;
-#endif
-

        default:
                break;
        }
        default:
                break;
        }


@@ -534,44 +608,83 @@ ipc_kobject_notify(
        mach_msg_header_t *request_header,
        mach_msg_header_t *reply_header)
 {
        mach_msg_header_t *request_header,
        mach_msg_header_t *reply_header)
 {

+       mach_msg_max_trailer_t * trailer;

        ipc_port_t port = (ipc_port_t) request_header->msgh_remote_port;
 
        ((mig_reply_error_t *) reply_header)->RetCode = MIG_NO_REPLY;
        ipc_port_t port = (ipc_port_t) request_header->msgh_remote_port;
 
        ((mig_reply_error_t *) reply_header)->RetCode = MIG_NO_REPLY;

+
+       trailer = (mach_msg_max_trailer_t *)
+                 ((vm_offset_t)request_header + request_header->msgh_size);
+
+       /*
+        * The kobject notification is privileged and can change the
+        * refcount on kernel-internal objects - make sure
+        * that the message wasn't faked!
+        */
+       if (0 != bcmp(&trailer->msgh_audit, &KERNEL_AUDIT_TOKEN,
+                       sizeof(trailer->msgh_audit))) {
+               return FALSE;
+       }
+       if (0 != bcmp(&trailer->msgh_sender, &KERNEL_SECURITY_TOKEN,
+                       sizeof(trailer->msgh_sender))) {
+               return FALSE;
+       }
+

        switch (request_header->msgh_id) {
                case MACH_NOTIFY_NO_SENDERS:
        switch (request_header->msgh_id) {
                case MACH_NOTIFY_NO_SENDERS:

-                  if(ip_kotype(port) == IKOT_NAMED_ENTRY) {
-                       ip_lock(port);
-
-                       /*
-                        * Bring the sequence number and mscount in
-                        * line with ipc_port_destroy assertion.
-                        */
-                       port->ip_mscount = 0;
-                       port->ip_messages.imq_seqno = 0;
-                       ipc_port_destroy(port); /* releases lock */
-                       return TRUE;
-                  }
-                  if (ip_kotype(port) == IKOT_UPL) {
-                          upl_no_senders(
-                               request_header->msgh_remote_port, 
-                               (mach_port_mscount_t) 
-                               ((mach_no_senders_notification_t *) 
-                                request_header)->not_count);
-                          reply_header->msgh_remote_port = MACH_PORT_NULL;
-                          return TRUE;
-                  }
+                       switch (ip_kotype(port)) {
+                       case IKOT_VOUCHER:
+                               ipc_voucher_notify(request_header);
+                               return TRUE;
+
+                       case IKOT_VOUCHER_ATTR_CONTROL:
+                               ipc_voucher_attr_control_notify(request_header);
+                               return TRUE;
+
+                       case IKOT_SEMAPHORE:
+                               semaphore_notify(request_header);
+                               return TRUE;
+
+                       case IKOT_TASK:
+                               task_port_notify(request_header);
+                               return TRUE;
+                               
+                       case IKOT_NAMED_ENTRY:
+                               ip_lock(port);
+
+                               /*
+                                * Bring the sequence number and mscount in
+                                * line with ipc_port_destroy assertion.
+                                */
+                               port->ip_mscount = 0;
+                               port->ip_messages.imq_seqno = 0;
+                               ipc_port_destroy(port); /* releases lock */
+                               return TRUE;
+
+                       case IKOT_UPL:
+                               upl_no_senders(
+                                       request_header->msgh_remote_port, 
+                                       (mach_port_mscount_t) 
+                                       ((mach_no_senders_notification_t *) 
+                                        request_header)->not_count);
+                               reply_header->msgh_remote_port = MACH_PORT_NULL;
+                               return TRUE;
+

 #if    CONFIG_AUDIT
 #if    CONFIG_AUDIT

-                  if (ip_kotype(port) == IKOT_AU_SESSIONPORT) {
-                          audit_session_nosenders(request_header);
-                          return TRUE;
-                  }
+                       case IKOT_AU_SESSIONPORT:
+                               audit_session_nosenders(request_header);
+                               return TRUE;

 #endif
 #endif

-                  if (ip_kotype(port) == IKOT_FILEPORT) {
-                       fileport_notify(request_header);
-                       return TRUE;
-                  }
+                       case IKOT_FILEPORT:
+                               fileport_notify(request_header);
+                               return TRUE;
+
+                       case IKOT_WORK_INTERVAL:
+                               work_interval_port_notify(request_header);
+                               return TRUE;

 
 

-                  break;
+                       }
+               break;

 
                case MACH_NOTIFY_PORT_DELETED:
                case MACH_NOTIFY_PORT_DESTROYED:
 
                case MACH_NOTIFY_PORT_DELETED:
                case MACH_NOTIFY_PORT_DESTROYED:


@@ -592,6 +705,11 @@ ipc_kobject_notify(
                 return iokit_notify(request_header);
                }
 #endif
                 return iokit_notify(request_header);
                }
 #endif

+               case IKOT_TASK_RESUME:
+               {
+                       return task_suspension_notify(request_header);
+               }
+

                default:
                 return FALSE;
         }
                default:
                 return FALSE;
         }