#include <security/mac_mach_internal.h>
+#if CONFIG_EMBEDDED && !SECURE_KERNEL
+extern int cs_relax_platform_task_ports;
+#endif
+
/* forward declarations */
task_t convert_port_to_locked_task(ipc_port_t port);
task_inspect_t convert_port_to_locked_task_inspect(ipc_port_t port);
-
+static void ipc_port_bind_special_reply_port_locked(ipc_port_t port);
+static kern_return_t ipc_port_unbind_special_reply_port(thread_t thread, boolean_t unbind_active_port);
+kern_return_t task_conversion_eval(task_t caller, task_t victim);
/*
* Routine: ipc_task_init
task->itk_debug_control = IP_NULL;
task->itk_space = space;
+#if CONFIG_MACF
+ for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) {
+ mac_exc_associate_action_label(&task->exc_actions[i], mac_exc_create_label());
+ }
+#endif
+
if (parent == TASK_NULL) {
ipc_port_t port;
for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; i++) {
task->exc_actions[i].port = IP_NULL;
-#if CONFIG_MACF
- mac_exc_action_label_init(task->exc_actions + i);
-#endif
}/* for */
kr = host_get_host_port(host_priv_self(), &port);
task->exc_actions[i].privileged =
parent->exc_actions[i].privileged;
#if CONFIG_MACF
- mac_exc_action_label_inherit(parent->exc_actions + i, task->exc_actions + i);
+ mac_exc_inherit_action_label(parent->exc_actions + i, task->exc_actions + i);
#endif
}/* for */
task->itk_host =
ipc_port_release_send(task->exc_actions[i].port);
}
#if CONFIG_MACF
- mac_exc_action_label_destroy(task->exc_actions + i);
+ mac_exc_free_action_label(task->exc_actions + i);
#endif
}
ipc_port_t old_exc_actions[EXC_TYPES_COUNT];
int i;
+#if CONFIG_MACF
+ /* Fresh label to unset credentials in existing labels. */
+ struct label *unset_label = mac_exc_create_label();
+#endif
+
new_kport = ipc_port_alloc_kernel();
if (new_kport == IP_NULL)
panic("ipc_task_reset");
/* the task is already terminated (can this happen?) */
itk_unlock(task);
ipc_port_dealloc_kernel(new_kport);
+#if CONFIG_MACF
+ mac_exc_free_label(unset_label);
+#endif
return;
}
if (!task->exc_actions[i].privileged) {
#if CONFIG_MACF
- mac_exc_action_label_reset(task->exc_actions + i);
+ mac_exc_update_action_label(task->exc_actions + i, unset_label);
#endif
old_exc_actions[i] = task->exc_actions[i].port;
task->exc_actions[i].port = IP_NULL;
itk_unlock(task);
+#if CONFIG_MACF
+ mac_exc_free_label(unset_label);
+#endif
+
/* release the naked send rights */
if (IP_VALID(old_sself))
thread->ith_self = kport;
thread->ith_sself = ipc_port_make_send(kport);
+ thread->ith_special_reply_port = NULL;
thread->exc_actions = NULL;
ipc_kobject_set(kport, (ipc_kobject_t)thread, IKOT_THREAD);
#if CONFIG_MACF
for (size_t i = 0; i < EXC_TYPES_COUNT; ++i) {
- mac_exc_action_label_init(thread->exc_actions + i);
+ mac_exc_associate_action_label(thread->exc_actions + i, mac_exc_create_label());
}
#endif
}
if (thread->exc_actions != NULL) {
#if CONFIG_MACF
for (size_t i = 0; i < EXC_TYPES_COUNT; ++i) {
- mac_exc_action_label_destroy(thread->exc_actions + i);
+ mac_exc_free_action_label(thread->exc_actions + i);
}
#endif
assert(thread->ith_assertions == 0);
#endif
+ /* unbind the thread special reply port */
+ if (IP_VALID(thread->ith_special_reply_port)) {
+ ipc_port_unbind_special_reply_port(thread, TRUE);
+ }
+
assert(ipc_kmsg_queue_empty(&thread->ith_messages));
if (thread->ith_rpc_reply != IP_NULL)
boolean_t has_old_exc_actions = FALSE;
int i;
+#if CONFIG_MACF
+ struct label *new_label = mac_exc_create_label();
+#endif
+
new_kport = ipc_port_alloc_kernel();
if (new_kport == IP_NULL)
panic("ipc_task_reset");
/* the is already terminated (can this happen?) */
thread_mtx_unlock(thread);
ipc_port_dealloc_kernel(new_kport);
+#if CONFIG_MACF
+ mac_exc_free_label(new_label);
+#endif
return;
}
old_exc_actions[i] = IP_NULL;
} else {
#if CONFIG_MACF
- mac_exc_action_label_reset(thread->exc_actions + i);
+ mac_exc_update_action_label(thread->exc_actions + i, new_label);
#endif
old_exc_actions[i] = thread->exc_actions[i].port;
thread->exc_actions[i].port = IP_NULL;
thread_mtx_unlock(thread);
+#if CONFIG_MACF
+ mac_exc_free_label(new_label);
+#endif
+
/* release the naked send rights */
if (IP_VALID(old_sself))
if (old_kport != IP_NULL) {
ipc_port_dealloc_kernel(old_kport);
}
+
+ /* unbind the thread special reply port */
+ if (IP_VALID(thread->ith_special_reply_port)) {
+ ipc_port_unbind_special_reply_port(thread, TRUE);
+ }
}
/*
return name;
}
+/*
+ * Routine: thread_get_special_reply_port [mach trap]
+ * Purpose:
+ * Allocate a special reply port for the calling thread.
+ * Conditions:
+ * Nothing locked.
+ * Returns:
+ * MACH_PORT_NULL if there are any resource failures
+ * or other errors.
+ */
+
+mach_port_name_t
+thread_get_special_reply_port(
+ __unused struct thread_get_special_reply_port_args *args)
+{
+ ipc_port_t port;
+ mach_port_name_t name;
+ kern_return_t kr;
+ thread_t thread = current_thread();
+
+ /* unbind the thread special reply port */
+ if (IP_VALID(thread->ith_special_reply_port)) {
+ kr = ipc_port_unbind_special_reply_port(thread, TRUE);
+ if (kr != KERN_SUCCESS) {
+ return MACH_PORT_NULL;
+ }
+ }
+
+ kr = ipc_port_alloc(current_task()->itk_space, &name, &port);
+ if (kr == KERN_SUCCESS) {
+ ipc_port_bind_special_reply_port_locked(port);
+ ip_unlock(port);
+ } else {
+ name = MACH_PORT_NULL;
+ }
+ return name;
+}
+
+/*
+ * Routine: ipc_port_bind_special_reply_port_locked
+ * Purpose:
+ * Bind the given port to current thread as a special reply port.
+ * Conditions:
+ * Port locked.
+ * Returns:
+ * None.
+ */
+
+static void
+ipc_port_bind_special_reply_port_locked(
+ ipc_port_t port)
+{
+ thread_t thread = current_thread();
+ assert(thread->ith_special_reply_port == NULL);
+
+ ip_reference(port);
+ thread->ith_special_reply_port = port;
+ port->ip_specialreply = 1;
+ port->ip_link_sync_qos = 1;
+}
+
+/*
+ * Routine: ipc_port_unbind_special_reply_port
+ * Purpose:
+ * Unbind the thread's special reply port.
+ * If the special port is linked to a port, adjust it's sync qos delta`.
+ * Condition:
+ * Nothing locked.
+ * Returns:
+ * None.
+ */
+static kern_return_t
+ipc_port_unbind_special_reply_port(
+ thread_t thread,
+ boolean_t unbind_active_port)
+{
+ ipc_port_t special_reply_port = thread->ith_special_reply_port;
+
+ ip_lock(special_reply_port);
+
+ /* Return error if port active and unbind_active_port set to FALSE */
+ if (unbind_active_port == FALSE && ip_active(special_reply_port)) {
+ ip_unlock(special_reply_port);
+ return KERN_FAILURE;
+ }
+
+ thread->ith_special_reply_port = NULL;
+ ipc_port_unlink_special_reply_port_locked(special_reply_port, NULL,
+ IPC_PORT_UNLINK_SR_CLEAR_SPECIAL_REPLY);
+ /* port unlocked */
+
+ ip_release(special_reply_port);
+ return KERN_SUCCESS;
+}
+
/*
* Routine: thread_get_special_port [kernel call]
* Purpose:
return KERN_SUCCESS;
}
+kern_return_t
+task_conversion_eval(task_t caller, task_t victim)
+{
+ /*
+ * Tasks are allowed to resolve their own task ports, and the kernel is
+ * allowed to resolve anyone's task port.
+ */
+ if (caller == kernel_task) {
+ return KERN_SUCCESS;
+ }
+
+ if (caller == victim) {
+ return KERN_SUCCESS;
+ }
+
+ /*
+ * Only the kernel can can resolve the kernel's task port. We've established
+ * by this point that the caller is not kernel_task.
+ */
+ if (victim == kernel_task) {
+ return KERN_INVALID_SECURITY;
+ }
+
+#if CONFIG_EMBEDDED
+ /*
+ * On embedded platforms, only a platform binary can resolve the task port
+ * of another platform binary.
+ */
+ if ((victim->t_flags & TF_PLATFORM) && !(caller->t_flags & TF_PLATFORM)) {
+#if SECURE_KERNEL
+ return KERN_INVALID_SECURITY;
+#else
+ if (cs_relax_platform_task_ports) {
+ return KERN_SUCCESS;
+ } else {
+ return KERN_INVALID_SECURITY;
+ }
+#endif /* SECURE_KERNEL */
+ }
+#endif /* CONFIG_EMBEDDED */
+
+ return KERN_SUCCESS;
+}
+
/*
* Routine: convert_port_to_locked_task
* Purpose:
task_t
convert_port_to_locked_task(ipc_port_t port)
{
- int try_failed_count = 0;
+ int try_failed_count = 0;
while (IP_VALID(port)) {
+ task_t ct = current_task();
task_t task;
ip_lock(port);
task = (task_t) port->ip_kobject;
assert(task != TASK_NULL);
- if (task == kernel_task && current_task() != kernel_task) {
+ if (task_conversion_eval(ct, task)) {
ip_unlock(port);
return TASK_NULL;
}
if ( ip_active(port) &&
ip_kotype(port) == IKOT_TASK ) {
+ task_t ct = current_task();
task = (task_t)port->ip_kobject;
assert(task != TASK_NULL);
- if (task == kernel_task && current_task() != kernel_task) {
+ if (task_conversion_eval(ct, task)) {
ip_unlock(port);
return TASK_NULL;
}
boolean_t privileged = current_task()->sec_token.val[0] == 0;
register int i;
+#if CONFIG_MACF
+ struct label *new_label;
+#endif
+
if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor))
return (KERN_INVALID_ARGUMENT);
+#if CONFIG_MACF
+ new_label = mac_exc_create_label_for_current_proc();
+#endif
+
thread_mtx_lock(thread);
if (!thread->active) {
for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) {
if ((exception_mask & (1 << i))
#if CONFIG_MACF
- && mac_exc_action_label_update(current_task(), thread->exc_actions + i) == 0
+ && mac_exc_update_action_label(&thread->exc_actions[i], new_label) == 0
#endif
) {
old_port[i] = thread->exc_actions[i].port;
thread_mtx_unlock(thread);
+#if CONFIG_MACF
+ mac_exc_free_label(new_label);
+#endif
+
for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i)
if (IP_VALID(old_port[i]))
ipc_port_release_send(old_port[i]);
boolean_t privileged = current_task()->sec_token.val[0] == 0;
register int i;
+#if CONFIG_MACF
+ struct label *new_label;
+#endif
+
if (task == TASK_NULL)
return (KERN_INVALID_ARGUMENT);
if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor))
return (KERN_INVALID_ARGUMENT);
+#if CONFIG_MACF
+ new_label = mac_exc_create_label_for_current_proc();
+#endif
+
itk_lock(task);
if (task->itk_self == IP_NULL) {
for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i) {
if ((exception_mask & (1 << i))
#if CONFIG_MACF
- && mac_exc_action_label_update(current_task(), task->exc_actions + i) == 0
+ && mac_exc_update_action_label(&task->exc_actions[i], new_label) == 0
#endif
) {
old_port[i] = task->exc_actions[i].port;
itk_unlock(task);
+#if CONFIG_MACF
+ mac_exc_free_label(new_label);
+#endif
+
for (i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT; ++i)
if (IP_VALID(old_port[i]))
ipc_port_release_send(old_port[i]);
boolean_t privileged = current_task()->sec_token.val[0] == 0;
unsigned int i, j, count;
+#if CONFIG_MACF
+ struct label *new_label;
+#endif
+
if (thread == THREAD_NULL)
return (KERN_INVALID_ARGUMENT);
if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor))
return (KERN_INVALID_ARGUMENT);
+#if CONFIG_MACF
+ new_label = mac_exc_create_label_for_current_proc();
+#endif
+
thread_mtx_lock(thread);
if (!thread->active) {
for (count = 0, i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT && count < *CountCnt; ++i) {
if ((exception_mask & (1 << i))
#if CONFIG_MACF
- && mac_exc_action_label_update(current_task(), thread->exc_actions + i) == 0
+ && mac_exc_update_action_label(&thread->exc_actions[i], new_label) == 0
#endif
) {
for (j = 0; j < count; ++j) {
thread_mtx_unlock(thread);
+#if CONFIG_MACF
+ mac_exc_free_label(new_label);
+#endif
+
while (--i >= FIRST_EXCEPTION) {
if (IP_VALID(old_port[i]))
ipc_port_release_send(old_port[i]);
boolean_t privileged = current_task()->sec_token.val[0] == 0;
unsigned int i, j, count;
+#if CONFIG_MACF
+ struct label *new_label;
+#endif
+
if (task == TASK_NULL)
return (KERN_INVALID_ARGUMENT);
if (new_flavor != 0 && !VALID_THREAD_STATE_FLAVOR(new_flavor))
return (KERN_INVALID_ARGUMENT);
+#if CONFIG_MACF
+ new_label = mac_exc_create_label_for_current_proc();
+#endif
+
itk_lock(task);
if (task->itk_self == IP_NULL) {
for (count = 0, i = FIRST_EXCEPTION; i < EXC_TYPES_COUNT && count < *CountCnt; ++i) {
if ((exception_mask & (1 << i))
#if CONFIG_MACF
- && mac_exc_action_label_update(current_task(), task->exc_actions + i) == 0
+ && mac_exc_update_action_label(&task->exc_actions[i], new_label) == 0
#endif
) {
for (j = 0; j < count; j++) {
itk_unlock(task);
+#if CONFIG_MACF
+ mac_exc_free_label(new_label);
+#endif
+
while (--i >= FIRST_EXCEPTION) {
if (IP_VALID(old_port[i]))
ipc_port_release_send(old_port[i]);
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