1 #include <signal.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <errno.h>
6
7 #include <darwintest.h>
8
9 T_GLOBAL_META(
10 T_META_RUN_CONCURRENTLY(true),
11 T_META_CHECK_LEAKS(false),
12 T_META_TAG_VM_PREFERRED,
13 T_META_RADAR_COMPONENT_NAME("xnu"),
14 T_META_RADAR_COMPONENT_VERSION("signals"));
15
16 static uint64_t stack_base, stack_end;
17
18 static void
signal_handler(int __unused signum,struct __siginfo * __unused info,void * __unused uap)19 signal_handler(int __unused signum, struct __siginfo * __unused info, void * __unused uap)
20 {
21 T_LOG("In signal handler\n");
22 uint64_t signal_stack = (uint64_t)__builtin_frame_address(0);
23 T_ASSERT_LE(stack_base, signal_stack, NULL);
24 T_ASSERT_LE(signal_stack, stack_end, NULL);
25 T_END;
26 }
27
28 T_DECL(signalstack, "Check that the signal stack is set up correctly", T_META_ASROOT(YES), T_META_TAG_VM_PREFERRED)
29 {
30 void* stack_allocation = malloc(SIGSTKSZ);
31
32 stack_base = (uint64_t)stack_allocation;
33 stack_end = stack_base + SIGSTKSZ;
34
35 T_LOG("stack base = 0x%llx\n", stack_base);
36 T_LOG("stack end = 0x%llx\n", stack_end);
37
38 stack_t alt_stack;
39 alt_stack.ss_sp = stack_allocation;
40 alt_stack.ss_size = SIGSTKSZ;
41 alt_stack.ss_flags = 0;
42
43 if (sigaltstack(&alt_stack, NULL) < 0) {
44 T_FAIL("error: sigaltstack failed\n");
45 }
46
47 sigset_t signal_mask;
48 sigemptyset(&signal_mask);
49
50 struct sigaction sig_action;
51 sig_action.sa_sigaction = signal_handler;
52 sig_action.sa_mask = signal_mask;
53 sig_action.sa_flags = SA_ONSTACK;
54
55 if (sigaction(SIGUSR1, &sig_action, NULL) != 0) {
56 T_FAIL("error: sigaction failed\n");
57 }
58
59 T_LOG("Sending a SIGUSR1\n");
60 kill(getpid(), SIGUSR1);
61
62 return;
63 }
64