1 #include <stdio.h> 2 #include <mach/mach_vm.h> 3 #include <mach/mach_port.h> 4 #include <mach/mach_error.h> 5 #include <sys/sysctl.h> 6 #include <sys/wait.h> 7 #include <unistd.h> 8 9 #ifdef T_NAMESPACE 10 #undef T_NAMESPACE 11 #endif 12 13 #include <darwintest.h> 14 #include <darwintest_utils.h> 15 16 T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true), 17 T_META_NAMESPACE("xnu.ipc"), 18 T_META_RADAR_COMPONENT_NAME("xnu"), 19 T_META_RADAR_COMPONENT_VERSION("IPC")); 20 21 T_DECL(test_task_filter_msg_flag, "Set the filter msg flag on the task and check if the forked child inherits it", 22 T_META_ASROOT(true), T_META_CHECK_LEAKS(false)) 23 { 24 int ret, dev; 25 size_t sysctl_size; 26 27 T_SETUPBEGIN; 28 29 dev = 0; 30 sysctl_size = sizeof(dev); 31 ret = sysctlbyname("kern.development", &dev, &sysctl_size, NULL, 0); 32 T_QUIET; T_ASSERT_POSIX_SUCCESS(ret, "sysctl kern.development failed"); 33 if (dev == 0) { 34 T_SKIP("Skipping test on release kernel"); 35 } 36 37 T_SETUPEND; 38 39 int cur_filter_flag = 0; 40 int new_filter_flag = 1; 41 ret = sysctlbyname("kern.task_set_filter_msg_flag", NULL, 0, &new_filter_flag, sizeof(new_filter_flag)); 42 T_ASSERT_POSIX_SUCCESS(ret, "sysctlbyname"); 43 ret = sysctlbyname("kern.task_set_filter_msg_flag", &cur_filter_flag, &sysctl_size, NULL, 0); 44 T_ASSERT_POSIX_SUCCESS(ret, "sysctlbyname"); 45 T_ASSERT_EQ(cur_filter_flag, 1, "Task should have filtering on"); 46 47 pid_t pid = fork(); 48 if (pid == 0) { 49 cur_filter_flag = 0; 50 ret = sysctlbyname("kern.task_set_filter_msg_flag", &cur_filter_flag, &sysctl_size, NULL, 0); 51 if (ret == 0) { 52 if (cur_filter_flag == 1) { 53 exit(0); 54 } 55 } 56 exit(1); 57 } 58 59 int status; 60 ret = waitpid(pid, &status, 0); 61 T_ASSERT_POSIX_SUCCESS(ret, "waitpid"); 62 63 if (WIFEXITED(status)) { 64 const int exit_code = WEXITSTATUS(status); 65 T_ASSERT_EQ(exit_code, 0, "Child inherited the filter msg flag"); 66 } 67 68 /* Turn off task msg filtering */ 69 cur_filter_flag = 1; 70 new_filter_flag = 0; 71 ret = sysctlbyname("kern.task_set_filter_msg_flag", &cur_filter_flag, &sysctl_size, &new_filter_flag, sizeof(new_filter_flag)); 72 T_ASSERT_POSIX_SUCCESS(ret, "sysctlbyname"); 73 T_ASSERT_EQ(cur_filter_flag, 1, "Task should have filtering on"); 74 75 T_END; 76 } 77