1*e7776783SApple OSS Distributions #include <stdio.h> 2*e7776783SApple OSS Distributions #include <mach/mach_vm.h> 3*e7776783SApple OSS Distributions #include <mach/mach_port.h> 4*e7776783SApple OSS Distributions #include <mach/mach_error.h> 5*e7776783SApple OSS Distributions #include <sys/sysctl.h> 6*e7776783SApple OSS Distributions #include <sys/wait.h> 7*e7776783SApple OSS Distributions #include <unistd.h> 8*e7776783SApple OSS Distributions 9*e7776783SApple OSS Distributions #ifdef T_NAMESPACE 10*e7776783SApple OSS Distributions #undef T_NAMESPACE 11*e7776783SApple OSS Distributions #endif 12*e7776783SApple OSS Distributions 13*e7776783SApple OSS Distributions #include <darwintest.h> 14*e7776783SApple OSS Distributions #include <darwintest_utils.h> 15*e7776783SApple OSS Distributions 16*e7776783SApple OSS Distributions T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true), 17*e7776783SApple OSS Distributions T_META_NAMESPACE("xnu.ipc"), 18*e7776783SApple OSS Distributions T_META_RADAR_COMPONENT_NAME("xnu"), 19*e7776783SApple OSS Distributions T_META_RADAR_COMPONENT_VERSION("IPC")); 20*e7776783SApple OSS Distributions 21*e7776783SApple OSS Distributions T_DECL(test_task_filter_msg_flag, "Set the filter msg flag on the task and check if the forked child inherits it", 22*e7776783SApple OSS Distributions T_META_ASROOT(true), T_META_CHECK_LEAKS(false)) 23*e7776783SApple OSS Distributions { 24*e7776783SApple OSS Distributions int ret, dev; 25*e7776783SApple OSS Distributions size_t sysctl_size; 26*e7776783SApple OSS Distributions 27*e7776783SApple OSS Distributions T_SETUPBEGIN; 28*e7776783SApple OSS Distributions 29*e7776783SApple OSS Distributions dev = 0; 30*e7776783SApple OSS Distributions sysctl_size = sizeof(dev); 31*e7776783SApple OSS Distributions ret = sysctlbyname("kern.development", &dev, &sysctl_size, NULL, 0); 32*e7776783SApple OSS Distributions T_QUIET; T_ASSERT_POSIX_SUCCESS(ret, "sysctl kern.development failed"); 33*e7776783SApple OSS Distributions if (dev == 0) { 34*e7776783SApple OSS Distributions T_SKIP("Skipping test on release kernel"); 35*e7776783SApple OSS Distributions } 36*e7776783SApple OSS Distributions 37*e7776783SApple OSS Distributions T_SETUPEND; 38*e7776783SApple OSS Distributions 39*e7776783SApple OSS Distributions int cur_filter_flag = 0; 40*e7776783SApple OSS Distributions int new_filter_flag = 1; 41*e7776783SApple OSS Distributions ret = sysctlbyname("kern.task_set_filter_msg_flag", NULL, 0, &new_filter_flag, sizeof(new_filter_flag)); 42*e7776783SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(ret, "sysctlbyname"); 43*e7776783SApple OSS Distributions ret = sysctlbyname("kern.task_set_filter_msg_flag", &cur_filter_flag, &sysctl_size, NULL, 0); 44*e7776783SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(ret, "sysctlbyname"); 45*e7776783SApple OSS Distributions T_ASSERT_EQ(cur_filter_flag, 1, "Task should have filtering on"); 46*e7776783SApple OSS Distributions 47*e7776783SApple OSS Distributions pid_t pid = fork(); 48*e7776783SApple OSS Distributions if (pid == 0) { 49*e7776783SApple OSS Distributions cur_filter_flag = 0; 50*e7776783SApple OSS Distributions ret = sysctlbyname("kern.task_set_filter_msg_flag", &cur_filter_flag, &sysctl_size, NULL, 0); 51*e7776783SApple OSS Distributions if (ret == 0) { 52*e7776783SApple OSS Distributions if (cur_filter_flag == 1) { 53*e7776783SApple OSS Distributions exit(0); 54*e7776783SApple OSS Distributions } 55*e7776783SApple OSS Distributions } 56*e7776783SApple OSS Distributions exit(1); 57*e7776783SApple OSS Distributions } 58*e7776783SApple OSS Distributions 59*e7776783SApple OSS Distributions int status; 60*e7776783SApple OSS Distributions ret = waitpid(pid, &status, 0); 61*e7776783SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(ret, "waitpid"); 62*e7776783SApple OSS Distributions 63*e7776783SApple OSS Distributions if (WIFEXITED(status)) { 64*e7776783SApple OSS Distributions const int exit_code = WEXITSTATUS(status); 65*e7776783SApple OSS Distributions T_ASSERT_EQ(exit_code, 0, "Child inherited the filter msg flag"); 66*e7776783SApple OSS Distributions } 67*e7776783SApple OSS Distributions 68*e7776783SApple OSS Distributions /* Turn off task msg filtering */ 69*e7776783SApple OSS Distributions cur_filter_flag = 1; 70*e7776783SApple OSS Distributions new_filter_flag = 0; 71*e7776783SApple OSS Distributions ret = sysctlbyname("kern.task_set_filter_msg_flag", &cur_filter_flag, &sysctl_size, &new_filter_flag, sizeof(new_filter_flag)); 72*e7776783SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(ret, "sysctlbyname"); 73*e7776783SApple OSS Distributions T_ASSERT_EQ(cur_filter_flag, 1, "Task should have filtering on"); 74*e7776783SApple OSS Distributions 75*e7776783SApple OSS Distributions T_END; 76*e7776783SApple OSS Distributions } 77