/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* 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.
+ */
/*
*/
#include <vm/vm_map.h>
#include <vm/vm_pageout.h>
-#include <vm/vm_shared_memory_server.h>
#include <vm/vm_protos.h>
+#include <security/mac_mach_internal.h>
+
/* forward declarations */
task_t convert_port_to_locked_task(ipc_port_t port);
{
ipc_space_t space;
ipc_port_t kport;
+ ipc_port_t nport;
kern_return_t kr;
int i;
if (kr != KERN_SUCCESS)
panic("ipc_task_init");
+ space->is_task = task;
kport = ipc_port_alloc_kernel();
if (kport == IP_NULL)
panic("ipc_task_init");
+ nport = ipc_port_alloc_kernel();
+ if (nport == IP_NULL)
+ panic("ipc_task_init");
+
itk_lock_init(task);
task->itk_self = kport;
+ task->itk_nself = nport;
task->itk_sself = ipc_port_make_send(kport);
task->itk_space = space;
space->is_fast = FALSE;
+#if CONFIG_MACF_MACH
+ if (parent)
+ mac_task_label_associate(parent, task, &parent->maclabel,
+ &task->maclabel, &kport->ip_label);
+ else
+ mac_task_label_associate_kernel(task, &task->maclabel, &kport->ip_label);
+#endif
+
if (parent == TASK_NULL) {
ipc_port_t port;
task->itk_host = port;
task->itk_bootstrap = IP_NULL;
+ task->itk_seatbelt = IP_NULL;
+ task->itk_gssd = IP_NULL;
+ task->itk_task_access = IP_NULL;
for (i = 0; i < TASK_PORT_REGISTER_MAX; i++)
task->itk_registered[i] = IP_NULL;
task->itk_bootstrap =
ipc_port_copy_send(parent->itk_bootstrap);
+ task->itk_seatbelt =
+ ipc_port_copy_send(parent->itk_seatbelt);
+
+ task->itk_gssd =
+ ipc_port_copy_send(parent->itk_gssd);
+
+ task->itk_task_access =
+ ipc_port_copy_send(parent->itk_task_access);
+
itk_unlock(parent);
}
}
task_t task)
{
ipc_port_t kport;
+ ipc_port_t nport;
itk_lock(task);
kport = task->itk_self;
if (kport != IP_NULL)
ipc_kobject_set(kport, (ipc_kobject_t) task, IKOT_TASK);
+ nport = task->itk_nself;
+ if (nport != IP_NULL)
+ ipc_kobject_set(nport, (ipc_kobject_t) task, IKOT_TASK_NAME);
itk_unlock(task);
}
task_t task)
{
ipc_port_t kport;
+ ipc_port_t nport;
itk_lock(task);
kport = task->itk_self;
if (kport != IP_NULL)
ipc_kobject_set(kport, IKO_NULL, IKOT_NONE);
+ nport = task->itk_nself;
+ if (nport != IP_NULL)
+ ipc_kobject_set(nport, IKO_NULL, IKOT_NONE);
itk_unlock(task);
}
task_t task)
{
ipc_port_t kport;
+ ipc_port_t nport;
int i;
itk_lock(task);
itk_unlock(task);
return;
}
-
task->itk_self = IP_NULL;
+
+ nport = task->itk_nself;
+ assert(nport != IP_NULL);
+ task->itk_nself = IP_NULL;
+
itk_unlock(task);
/* release the naked send rights */
if (IP_VALID(task->itk_bootstrap))
ipc_port_release_send(task->itk_bootstrap);
+ if (IP_VALID(task->itk_seatbelt))
+ ipc_port_release_send(task->itk_seatbelt);
+
+ if (IP_VALID(task->itk_gssd))
+ ipc_port_release_send(task->itk_gssd);
+
+ if (IP_VALID(task->itk_task_access))
+ ipc_port_release_send(task->itk_task_access);
+
for (i = 0; i < TASK_PORT_REGISTER_MAX; i++)
if (IP_VALID(task->itk_registered[i]))
ipc_port_release_send(task->itk_registered[i]);
ipc_port_release_send(task->wired_ledger_port);
ipc_port_release_send(task->paged_ledger_port);
- /* destroy the kernel port */
+ /* destroy the kernel ports */
ipc_port_dealloc_kernel(kport);
+ ipc_port_dealloc_kernel(nport);
+
+ itk_lock_destroy(task);
}
/*
* Routine: ipc_task_reset
* Purpose:
* Reset a task's IPC state to protect it when
- * it enters an elevated security context.
+ * it enters an elevated security context. The
+ * task name port can remain the same - since
+ * it represents no specific privilege.
* Conditions:
* Nothing locked. The task must be suspended.
* (Or the current thread must be in the task.)
thread->ith_rpc_reply = IP_NULL;
}
+/*
+ * Routine: ipc_thread_reset
+ * Purpose:
+ * Reset the IPC state for a given Mach thread when
+ * its task enters an elevated security context.
+ * Both the thread port and its exception ports have
+ * to be reset. Its RPC reply port cannot have any
+ * rights outstanding, so it should be fine.
+ * Conditions:
+ * Nothing locked.
+ */
+
+void
+ipc_thread_reset(
+ thread_t thread)
+{
+ ipc_port_t old_kport, new_kport;
+ ipc_port_t old_sself;
+ ipc_port_t old_exc_actions[EXC_TYPES_COUNT];
+ int i;
+
+ new_kport = ipc_port_alloc_kernel();
+ if (new_kport == IP_NULL)
+ panic("ipc_task_reset");
+
+ thread_mtx_lock(thread);
+
+ old_kport = thread->ith_self;
+
+ if (old_kport == IP_NULL) {
+ /* the is already terminated (can this happen?) */
+ thread_mtx_unlock(thread);
+ ipc_port_dealloc_kernel(new_kport);
+ return;
+ }
+
+ thread->ith_self = new_kport;
+ old_sself = thread->ith_sself;
+ thread->ith_sself = ipc_port_make_send(new_kport);
+ ipc_kobject_set(old_kport, IKO_NULL, IKOT_NONE);
+ ipc_kobject_set(new_kport, (ipc_kobject_t) thread, IKOT_THREAD);
+
+ for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) {
+ if (!thread->exc_actions[i].privileged) {
+ old_exc_actions[i] = thread->exc_actions[i].port;
+ thread->exc_actions[i].port = IP_NULL;
+ } else {
+ old_exc_actions[i] = IP_NULL;
+ }
+ }/* for */
+
+ thread_mtx_unlock(thread);
+
+ /* release the naked send rights */
+
+ if (IP_VALID(old_sself))
+ ipc_port_release_send(old_sself);
+
+ for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) {
+ if (IP_VALID(old_exc_actions[i])) {
+ ipc_port_release_send(old_exc_actions[i]);
+ }
+ }/* for */
+
+ /* destroy the kernel port */
+ ipc_port_dealloc_kernel(old_kport);
+}
+
/*
* Routine: retrieve_task_self_fast
* Purpose:
int which,
ipc_port_t *portp)
{
- ipc_port_t *whichp;
ipc_port_t port;
if (task == TASK_NULL)
return KERN_INVALID_ARGUMENT;
+ itk_lock(task);
+ if (task->itk_self == IP_NULL) {
+ itk_unlock(task);
+ return KERN_FAILURE;
+ }
+
switch (which) {
case TASK_KERNEL_PORT:
- whichp = &task->itk_sself;
+ port = ipc_port_copy_send(task->itk_sself);
+ break;
+
+ case TASK_NAME_PORT:
+ port = ipc_port_make_send(task->itk_nself);
break;
case TASK_HOST_PORT:
- whichp = &task->itk_host;
+ port = ipc_port_copy_send(task->itk_host);
break;
case TASK_BOOTSTRAP_PORT:
- whichp = &task->itk_bootstrap;
+ port = ipc_port_copy_send(task->itk_bootstrap);
break;
- case TASK_WIRED_LEDGER_PORT:
- whichp = &task->wired_ledger_port;
- break;
+ case TASK_WIRED_LEDGER_PORT:
+ port = ipc_port_copy_send(task->wired_ledger_port);
+ break;
- case TASK_PAGED_LEDGER_PORT:
- whichp = &task->paged_ledger_port;
- break;
+ case TASK_PAGED_LEDGER_PORT:
+ port = ipc_port_copy_send(task->paged_ledger_port);
+ break;
+ case TASK_SEATBELT_PORT:
+ port = ipc_port_copy_send(task->itk_seatbelt);
+ break;
+
+ case TASK_GSSD_PORT:
+ port = ipc_port_copy_send(task->itk_gssd);
+ break;
+
+ case TASK_ACCESS_PORT:
+ port = ipc_port_copy_send(task->itk_task_access);
+ break;
+
default:
+ itk_unlock(task);
return KERN_INVALID_ARGUMENT;
}
-
- itk_lock(task);
- if (task->itk_self == IP_NULL) {
- itk_unlock(task);
- return KERN_FAILURE;
- }
-
- port = ipc_port_copy_send(*whichp);
itk_unlock(task);
*portp = port;
* KERN_INVALID_ARGUMENT The task is null.
* KERN_FAILURE The task/space is dead.
* KERN_INVALID_ARGUMENT Invalid special port.
+ * KERN_NO_ACCESS Attempted overwrite of seatbelt port.
*/
kern_return_t
whichp = &task->itk_bootstrap;
break;
- case TASK_WIRED_LEDGER_PORT:
- whichp = &task->wired_ledger_port;
- break;
+ case TASK_WIRED_LEDGER_PORT:
+ whichp = &task->wired_ledger_port;
+ break;
- case TASK_PAGED_LEDGER_PORT:
- whichp = &task->paged_ledger_port;
- break;
+ case TASK_PAGED_LEDGER_PORT:
+ whichp = &task->paged_ledger_port;
+ break;
+ case TASK_SEATBELT_PORT:
+ whichp = &task->itk_seatbelt;
+ break;
+
+ case TASK_GSSD_PORT:
+ whichp = &task->itk_gssd;
+ break;
+
+ case TASK_ACCESS_PORT:
+ whichp = &task->itk_task_access;
+ break;
+
default:
return KERN_INVALID_ARGUMENT;
}/* switch */
return KERN_FAILURE;
}
+ /* do not allow overwrite of seatbelt or task access ports */
+ if ((TASK_SEATBELT_PORT == which || TASK_ACCESS_PORT == which)
+ && IP_VALID(*whichp)) {
+ itk_unlock(task);
+ return KERN_NO_ACCESS;
+ }
+
+#if CONFIG_MACF_MACH
+ if (mac_task_check_service(current_task(), task, "set_special_port")) {
+ itk_unlock(task);
+ return KERN_NO_ACCESS;
+ }
+#endif
+
old = *whichp;
*whichp = port;
itk_unlock(task);
task_t
convert_port_to_locked_task(ipc_port_t port)
{
+ int try_failed_count = 0;
+
while (IP_VALID(port)) {
task_t task;
ip_unlock(port);
return(task);
}
+ try_failed_count++;
ip_unlock(port);
- mutex_pause();
+ mutex_pause(try_failed_count);
}
return TASK_NULL;
}
return (task);
}
+/*
+ * Routine: convert_port_to_task_name
+ * Purpose:
+ * Convert from a port to a task name.
+ * Doesn't consume the port ref; produces a task name ref,
+ * which may be null.
+ * Conditions:
+ * Nothing locked.
+ */
+task_name_t
+convert_port_to_task_name(
+ ipc_port_t port)
+{
+ task_name_t task = TASK_NULL;
+
+ if (IP_VALID(port)) {
+ ip_lock(port);
+
+ if ( ip_active(port) &&
+ (ip_kotype(port) == IKOT_TASK ||
+ ip_kotype(port) == IKOT_TASK_NAME)) {
+ task = (task_name_t)port->ip_kobject;
+ assert(task != TASK_NAME_NULL);
+
+ task_reference_internal(task);
+ }
+
+ ip_unlock(port);
+ }
+
+ return (task);
+}
+
/*
* Routine: convert_port_to_space
* Purpose:
return port;
}
+/*
+ * Routine: convert_task_name_to_port
+ * Purpose:
+ * Convert from a task name ref to a port.
+ * Consumes a task name ref; produces a naked send right
+ * which may be invalid.
+ * Conditions:
+ * Nothing locked.
+ */
+
+ipc_port_t
+convert_task_name_to_port(
+ task_name_t task_name)
+{
+ ipc_port_t port;
+
+ itk_lock(task_name);
+ if (task_name->itk_nself != IP_NULL)
+ port = ipc_port_make_send(task_name->itk_nself);
+ else
+ port = IP_NULL;
+ itk_unlock(task_name);
+
+ task_name_deallocate(task_name);
+ return port;
+}
+
/*
* Routine: convert_thread_to_port
* Purpose:
thread_state_flavor_t new_flavor)
{
ipc_port_t old_port[EXC_TYPES_COUNT];
+ boolean_t privileged = current_task()->sec_token.val[0] == 0;
register int i;
if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- if (exception_mask & ~EXC_MASK_ALL)
+ if (exception_mask & ~EXC_MASK_VALID)
return (KERN_INVALID_ARGUMENT);
if (IP_VALID(new_port)) {
- switch (new_behavior) {
+ switch (new_behavior & ~MACH_EXCEPTION_CODES) {
case EXCEPTION_DEFAULT:
case EXCEPTION_STATE:
thread->exc_actions[i].port = ipc_port_copy_send(new_port);
thread->exc_actions[i].behavior = new_behavior;
thread->exc_actions[i].flavor = new_flavor;
+ thread->exc_actions[i].privileged = privileged;
}
else
old_port[i] = IP_NULL;
if (task == TASK_NULL)
return (KERN_INVALID_ARGUMENT);
- if (exception_mask & ~EXC_MASK_ALL)
+ if (exception_mask & ~EXC_MASK_VALID)
return (KERN_INVALID_ARGUMENT);
if (IP_VALID(new_port)) {
- switch (new_behavior) {
+ switch (new_behavior & ~MACH_EXCEPTION_CODES) {
case EXCEPTION_DEFAULT:
case EXCEPTION_STATE:
thread_state_flavor_array_t flavors)
{
ipc_port_t old_port[EXC_TYPES_COUNT];
+ boolean_t privileged = current_task()->sec_token.val[0] == 0;
unsigned int i, j, count;
if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- if (exception_mask & ~EXC_MASK_ALL)
+ if (exception_mask & ~EXC_MASK_VALID)
return (KERN_INVALID_ARGUMENT);
if (IP_VALID(new_port)) {
- switch (new_behavior) {
+ switch (new_behavior & ~MACH_EXCEPTION_CODES) {
case EXCEPTION_DEFAULT:
case EXCEPTION_STATE:
thread->exc_actions[i].port = ipc_port_copy_send(new_port);
thread->exc_actions[i].behavior = new_behavior;
thread->exc_actions[i].flavor = new_flavor;
+ thread->exc_actions[i].privileged = privileged;
if (count > *CountCnt)
break;
}
if (task == TASK_NULL)
return (KERN_INVALID_ARGUMENT);
- if (exception_mask & ~EXC_MASK_ALL)
+ if (exception_mask & ~EXC_MASK_VALID)
return (KERN_INVALID_ARGUMENT);
if (IP_VALID(new_port)) {
- switch (new_behavior) {
+ switch (new_behavior & ~MACH_EXCEPTION_CODES) {
case EXCEPTION_DEFAULT:
case EXCEPTION_STATE:
if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
- if (exception_mask & ~EXC_MASK_ALL)
+ if (exception_mask & ~EXC_MASK_VALID)
return (KERN_INVALID_ARGUMENT);
thread_mtx_lock(thread);
if (task == TASK_NULL)
return (KERN_INVALID_ARGUMENT);
- if (exception_mask & ~EXC_MASK_ALL)
+ if (exception_mask & ~EXC_MASK_VALID)
return (KERN_INVALID_ARGUMENT);
itk_lock(task);
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