[apple/xnu.git] / tests / exc_resource_threads.c

#ifdef T_NAMESPACE
#undef T_NAMESPACE
#endif


#include <darwintest.h>
#include <dispatch/dispatch.h>
#include <stdlib.h>
#include <spawn.h>
#include <spawn_private.h>

#include <mach-o/dyld.h>
#include <mach/mach.h>
#include <mach/task.h>

#include <signal.h>
#include <sys/sysctl.h>
#include <sys/syslimits.h>

#include <excserver.h>

static dispatch_semaphore_t sync_sema;

kern_return_t
catch_mach_exception_raise(mach_port_t exception_port,
    mach_port_t thread,
    mach_port_t task,
    exception_type_t exception,
    mach_exception_data_t code,
    mach_msg_type_number_t code_count)
{
#pragma unused(exception_port, thread, task, code, code_count)
	pid_t pid;
	pid_for_task(task, &pid);
	T_ASSERT_EQ(exception, EXC_CORPSE_NOTIFY, "exception type");
	T_ASSERT_POSIX_ZERO(kill(pid, SIGKILL), "kill");
	dispatch_semaphore_signal(sync_sema);
	return KERN_SUCCESS;
}

kern_return_t
catch_mach_exception_raise_state(mach_port_t exception_port,
    exception_type_t exception,
    const mach_exception_data_t code,
    mach_msg_type_number_t code_count,
    int * flavor,
    const thread_state_t old_state,
    mach_msg_type_number_t old_state_count,
    thread_state_t new_state,
    mach_msg_type_number_t * new_state_count)
{
#pragma unused(exception_port, exception, code, code_count, flavor, old_state, old_state_count, new_state, new_state_count)
	T_FAIL("Unsupported catch_mach_exception_raise_state");
	return KERN_NOT_SUPPORTED;
}

kern_return_t
catch_mach_exception_raise_state_identity(mach_port_t exception_port,
    mach_port_t thread,
    mach_port_t task,
    exception_type_t exception,
    mach_exception_data_t code,
    mach_msg_type_number_t code_count,
    int * flavor,
    thread_state_t old_state,
    mach_msg_type_number_t old_state_count,
    thread_state_t new_state,
    mach_msg_type_number_t * new_state_count)
{
#pragma unused(exception_port, thread, task, exception, code, code_count, flavor, old_state, old_state_count, new_state, new_state_count)
	T_FAIL("Unsupported catch_mach_exception_raise_state_identity");
	return KERN_NOT_SUPPORTED;
}


/*
 * setup exception handling port for EXC_CORPSE_NOTIFY.
 * runs mach_msg_server once for receiving exception messages from kernel.
 */
static void *
exc_handler(void * arg)
{
#pragma unused(arg)
	kern_return_t kret;
	mach_port_t exception_port;

	kret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &exception_port);
	if (kret != KERN_SUCCESS) {
		T_FAIL("mach_port_allocate: %s (%d)", mach_error_string(kret), kret);
	}

	kret = mach_port_insert_right(mach_task_self(), exception_port, exception_port, MACH_MSG_TYPE_MAKE_SEND);
	if (kret != KERN_SUCCESS) {
		T_FAIL("mach_port_insert_right: %s (%d)", mach_error_string(kret), kret);
	}

	kret = task_set_exception_ports(mach_task_self(), EXC_MASK_CRASH | EXC_MASK_CORPSE_NOTIFY, exception_port,
	    (exception_behavior_t)(EXCEPTION_DEFAULT | MACH_EXCEPTION_CODES), 0);
	if (kret != KERN_SUCCESS) {
		T_FAIL("task_set_exception_ports: %s (%d)", mach_error_string(kret), kret);
	}

	dispatch_semaphore_signal(sync_sema);

	kret = mach_msg_server(mach_exc_server, MACH_MSG_SIZE_RELIABLE, exception_port, 0);
	if (kret != KERN_SUCCESS) {
		T_FAIL("mach_msg_server: %s (%d)", mach_error_string(kret), kret);
	}

	return NULL;
}

static void*
dummy_thread(void *arg)
{
#pragma unused(arg)
	while (1) {
		sleep(60);
	}
}

#define THREAD_LIMIT 2

T_HELPER_DECL(exc_resource_helper, "exc_resource helper")
{
	pthread_t tid;
	for (int i = 0; i < THREAD_LIMIT; i++) {
		T_QUIET;
		T_EXPECT_POSIX_SUCCESS(pthread_create(&tid, NULL, dummy_thread, NULL), "pthread_create");
	}
	while (1) {
		sleep(60);
	}
}

static void
check_exc_resource_threads_enabled()
{
	int err;
	int enabled;
	size_t enabled_size = sizeof(enabled);
	err = sysctlbyname("kern.exc_resource_threads_enabled", &enabled, &enabled_size, NULL, 0);

	if (err || !enabled) {
		T_SKIP("EXC_RESOURCE RESOURCE_TYPE_THREADS not enabled on this system");
	}
}

T_DECL(exc_resource_threads, "Ensures that a process with a thread_limit set will receive an exc_resource when it crosses its thread limit",
    T_META_ASROOT(true),
    T_META_CHECK_LEAKS(false))
{
	pthread_t handle_thread;

	check_exc_resource_threads_enabled();

	sync_sema = dispatch_semaphore_create(0);

	T_ASSERT_POSIX_ZERO(pthread_create(&handle_thread, NULL, exc_handler, NULL), "pthread_create");
	dispatch_semaphore_wait(sync_sema, DISPATCH_TIME_FOREVER);

	pid_t helper_pid;
	char path[PATH_MAX];
	uint32_t path_size = sizeof(path);

	T_ASSERT_POSIX_ZERO(_NSGetExecutablePath(path, &path_size), "_NSGetExecutablePath");

	char *args[] = { path, "-n", "exc_resource_helper", NULL };

	posix_spawnattr_t attr;
	T_ASSERT_POSIX_ZERO(posix_spawnattr_init(&attr), "posix_spawnattr_init");

	T_EXPECT_POSIX_ZERO(posix_spawnattr_set_threadlimit_ext(&attr, THREAD_LIMIT), "posix_spawnattr_set_threadlimit_ext");

	T_EXPECT_POSIX_ZERO(posix_spawn(&helper_pid, args[0], NULL, &attr, args, NULL), "posix_spawn");

	T_ASSERT_POSIX_ZERO(posix_spawnattr_destroy(&attr), "posix_spawnattr_destroy");

	dispatch_semaphore_wait(sync_sema, DISPATCH_TIME_FOREVER);
}
Commit	Line	Data
d9a64523 A	1	#ifdef T_NAMESPACE
	2	#undef T_NAMESPACE
	3	#endif
	4
	5
	6	#include <darwintest.h>
	7	#include <dispatch/dispatch.h>
	8	#include <stdlib.h>
	9	#include <spawn.h>
	10	#include <spawn_private.h>
	11
	12	#include <mach-o/dyld.h>
	13	#include <mach/mach.h>
	14	#include <mach/task.h>
	15
	16	#include <signal.h>
	17	#include <sys/sysctl.h>
	18	#include <sys/syslimits.h>
	19
	20	#include <excserver.h>
	21
	22	static dispatch_semaphore_t sync_sema;
	23
	24	kern_return_t
	25	catch_mach_exception_raise(mach_port_t exception_port,
0a7de745 A	26	mach_port_t thread,
	27	mach_port_t task,
	28	exception_type_t exception,
	29	mach_exception_data_t code,
	30	mach_msg_type_number_t code_count)
d9a64523 A	31	{
	32	#pragma unused(exception_port, thread, task, code, code_count)
	33	pid_t pid;
	34	pid_for_task(task, &pid);
	35	T_ASSERT_EQ(exception, EXC_CORPSE_NOTIFY, "exception type");
	36	T_ASSERT_POSIX_ZERO(kill(pid, SIGKILL), "kill");
	37	dispatch_semaphore_signal(sync_sema);
	38	return KERN_SUCCESS;
	39	}
	40
	41	kern_return_t
	42	catch_mach_exception_raise_state(mach_port_t exception_port,
0a7de745 A	43	exception_type_t exception,
	44	const mach_exception_data_t code,
	45	mach_msg_type_number_t code_count,
	46	int * flavor,
	47	const thread_state_t old_state,
	48	mach_msg_type_number_t old_state_count,
	49	thread_state_t new_state,
	50	mach_msg_type_number_t * new_state_count)
d9a64523 A	51	{
	52	#pragma unused(exception_port, exception, code, code_count, flavor, old_state, old_state_count, new_state, new_state_count)
	53	T_FAIL("Unsupported catch_mach_exception_raise_state");
	54	return KERN_NOT_SUPPORTED;
	55	}
	56
	57	kern_return_t
	58	catch_mach_exception_raise_state_identity(mach_port_t exception_port,
0a7de745 A	59	mach_port_t thread,
	60	mach_port_t task,
	61	exception_type_t exception,
	62	mach_exception_data_t code,
	63	mach_msg_type_number_t code_count,
	64	int * flavor,
	65	thread_state_t old_state,
	66	mach_msg_type_number_t old_state_count,
	67	thread_state_t new_state,
	68	mach_msg_type_number_t * new_state_count)
d9a64523 A	69	{
	70	#pragma unused(exception_port, thread, task, exception, code, code_count, flavor, old_state, old_state_count, new_state, new_state_count)
	71	T_FAIL("Unsupported catch_mach_exception_raise_state_identity");
	72	return KERN_NOT_SUPPORTED;
	73	}
	74
	75
	76	/*
	77	* setup exception handling port for EXC_CORPSE_NOTIFY.
	78	* runs mach_msg_server once for receiving exception messages from kernel.
	79	*/
	80	static void *
	81	exc_handler(void * arg)
	82	{
	83	#pragma unused(arg)
	84	kern_return_t kret;
	85	mach_port_t exception_port;
	86
	87	kret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &exception_port);
0a7de745	88	if (kret != KERN_SUCCESS) {
d9a64523	89	T_FAIL("mach_port_allocate: %s (%d)", mach_error_string(kret), kret);
0a7de745	90	}
d9a64523 A	91
d9a64523 A	92	kret = mach_port_insert_right(mach_task_self(), exception_port, exception_port, MACH_MSG_TYPE_MAKE_SEND);
0a7de745	93	if (kret != KERN_SUCCESS) {
d9a64523	94	T_FAIL("mach_port_insert_right: %s (%d)", mach_error_string(kret), kret);
0a7de745	95	}
d9a64523 A	96
d9a64523 A	97	kret = task_set_exception_ports(mach_task_self(), EXC_MASK_CRASH \| EXC_MASK_CORPSE_NOTIFY, exception_port,
0a7de745 A	98	(exception_behavior_t)(EXCEPTION_DEFAULT \| MACH_EXCEPTION_CODES), 0);
0a7de745 A	99	if (kret != KERN_SUCCESS) {
d9a64523	100	T_FAIL("task_set_exception_ports: %s (%d)", mach_error_string(kret), kret);
0a7de745	101	}
d9a64523 A	102
	103	dispatch_semaphore_signal(sync_sema);
	104
	105	kret = mach_msg_server(mach_exc_server, MACH_MSG_SIZE_RELIABLE, exception_port, 0);
0a7de745	106	if (kret != KERN_SUCCESS) {
d9a64523	107	T_FAIL("mach_msg_server: %s (%d)", mach_error_string(kret), kret);
0a7de745	108	}
d9a64523 A	109
	110	return NULL;
	111	}
	112
	113	static void*
0a7de745 A	114	dummy_thread(void *arg)
0a7de745 A	115	{
d9a64523 A	116	#pragma unused(arg)
	117	while (1) {
	118	sleep(60);
	119	}
	120	}
	121
	122	#define THREAD_LIMIT 2
	123
	124	T_HELPER_DECL(exc_resource_helper, "exc_resource helper")
	125	{
	126	pthread_t tid;
	127	for (int i = 0; i < THREAD_LIMIT; i++) {
	128	T_QUIET;
	129	T_EXPECT_POSIX_SUCCESS(pthread_create(&tid, NULL, dummy_thread, NULL), "pthread_create");
	130	}
	131	while (1) {
	132	sleep(60);
	133	}
	134	}
	135
	136	static void
	137	check_exc_resource_threads_enabled()
	138	{
	139	int err;
	140	int enabled;
	141	size_t enabled_size = sizeof(enabled);
	142	err = sysctlbyname("kern.exc_resource_threads_enabled", &enabled, &enabled_size, NULL, 0);
	143
0a7de745	144	if (err \|\| !enabled) {
d9a64523	145	T_SKIP("EXC_RESOURCE RESOURCE_TYPE_THREADS not enabled on this system");
0a7de745	146	}
d9a64523 A	147	}
	148
	149	T_DECL(exc_resource_threads, "Ensures that a process with a thread_limit set will receive an exc_resource when it crosses its thread limit",
0a7de745 A	150	T_META_ASROOT(true),
0a7de745 A	151	T_META_CHECK_LEAKS(false))
d9a64523 A	152	{
	153	pthread_t handle_thread;
	154
	155	check_exc_resource_threads_enabled();
	156
	157	sync_sema = dispatch_semaphore_create(0);
	158
	159	T_ASSERT_POSIX_ZERO(pthread_create(&handle_thread, NULL, exc_handler, NULL), "pthread_create");
	160	dispatch_semaphore_wait(sync_sema, DISPATCH_TIME_FOREVER);
	161
	162	pid_t helper_pid;
	163	char path[PATH_MAX];
	164	uint32_t path_size = sizeof(path);
	165
	166	T_ASSERT_POSIX_ZERO(_NSGetExecutablePath(path, &path_size), "_NSGetExecutablePath");
	167
	168	char *args[] = { path, "-n", "exc_resource_helper", NULL };
	169
	170	posix_spawnattr_t attr;
	171	T_ASSERT_POSIX_ZERO(posix_spawnattr_init(&attr), "posix_spawnattr_init");
	172
	173	T_EXPECT_POSIX_ZERO(posix_spawnattr_set_threadlimit_ext(&attr, THREAD_LIMIT), "posix_spawnattr_set_threadlimit_ext");
	174
	175	T_EXPECT_POSIX_ZERO(posix_spawn(&helper_pid, args[0], NULL, &attr, args, NULL), "posix_spawn");
	176
	177	T_ASSERT_POSIX_ZERO(posix_spawnattr_destroy(&attr), "posix_spawnattr_destroy");
	178
	179	dispatch_semaphore_wait(sync_sema, DISPATCH_TIME_FOREVER);
	180	}