/*
* Copyright (c) 2024 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
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* 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,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* 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@
*/
/*
* exc_guard_helper_test_unexpected.c
*
* Test the testing helper functions in exc_guard_helper.h.
* The exception handler used by block_raise_exc_guard_of_type()
* should allow other exceptions to continue to a crash.
*/
#include "test_utils.h"
#include "exc_guard_helper.h"
#include <darwintest.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <mach/mach.h>
#include <mach/mach_vm.h>
#include <mach/task_info.h>
T_GLOBAL_META(
T_META_NAMESPACE("xnu"),
T_META_RADAR_COMPONENT_NAME("xnu"),
T_META_RADAR_COMPONENT_VERSION("vm"),
T_META_RUN_CONCURRENTLY(true),
T_META_ALL_VALID_ARCHS(true),
T_META_IGNORECRASHES(".*exc_guard_helper_test_unexpected.*")
);
T_DECL(exc_guard_helper_test_unexpected_exc_guard,
"provoke one guard exception type while exc_guard_helper is expecting another")
{
if (process_is_translated()) {
T_SKIP("VM guard exceptions not supported on Rosetta (rdar://142438840)");
}
pid_t child_pid;
if ((child_pid = fork())) {
/* parent */
T_QUIET; T_ASSERT_POSIX_SUCCESS(child_pid, "fork");
int status;
pid_t waited_pid;
waited_pid = waitpid(child_pid, &status, 0);
T_QUIET; T_ASSERT_POSIX_SUCCESS(waited_pid, "waitpid");
T_QUIET; T_ASSERT_EQ(waited_pid, child_pid, "waitpid");
T_ASSERT_TRUE(WIFSIGNALED(status), "child should have crashed");
T_ASSERT_EQ(WTERMSIG(status), SIGKILL, "child should have crashed with SIGKILL");
} else {
/* child */
kern_return_t kr;
task_exc_guard_behavior_t behavior;
exc_guard_helper_info_t exc_info;
mach_port_t port;
exc_guard_helper_init();
/*
* set GUARD_TYPE_MACH_PORT to be enabled and fatal.
* This child process is expected to crash.
*/
kr = task_get_exc_guard_behavior(mach_task_self(), &behavior);
T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "get old behavior");
behavior &= ~TASK_EXC_GUARD_MP_ALL;
behavior |= TASK_EXC_GUARD_MP_DELIVER | TASK_EXC_GUARD_MP_FATAL;
kr = task_set_exc_guard_behavior(mach_task_self(), behavior);
T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "set fatal mach port behavior");
kr = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &port);
T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "new port");
kr = mach_port_insert_right(mach_task_self(), port, port, MACH_MSG_TYPE_MAKE_SEND);
T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "make send");
/* provoke GUARD_TYPE_MACH_PORT while listening for GUARD_TYPE_VIRT_MEMORY */
if (block_raised_exc_guard_of_type(GUARD_TYPE_VIRT_MEMORY, &exc_info, ^{
kern_return_t kr;
T_LOG("CHILD EXPECTED TO CRASH after this guard exception");
kr = mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_SEND, INT32_MAX);
T_QUIET; T_ASSERT_MACH_ERROR(kr, KERN_INVALID_VALUE, "add too many send rights");
})) {
T_FAIL("Mach port guard exception unexpectedly caught by VM guard exception handler");
}
T_FAIL("expected Mach port guard exception to kill the process");
}
}