1 // RUN: %clangxx_msan -DPRE1 -O0 %s -o %t && not %run %t 2>&1
2 // RUN: %clangxx_msan -DPRE2 -O0 %s -o %t && not %run %t 2>&1
3 // RUN: %clangxx_msan -DPRE3 -O0 %s -o %t && not %run %t 2>&1
4 // RUN: %clangxx_msan -O0 %s -o %t && %run %t 2>&1
5
6 #include <assert.h>
7 #include <signal.h>
8 #include <string.h>
9
10 #include <sanitizer/linux_syscall_hooks.h>
11 #include <sanitizer/msan_interface.h>
12
13 struct my_kernel_sigaction {
14 long handler, flags, restorer;
15 uint64_t mask[20]; // larger than any known platform
16 };
17
main()18 int main() {
19 my_kernel_sigaction act = {}, oldact = {};
20
21 #if defined(PRE1)
22 __msan_poison(&act.handler, sizeof(act.handler));
23 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);
24 #elif defined(PRE2)
25 __msan_poison(&act.flags, sizeof(act.flags));
26 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);
27 #elif defined(PRE3)
28 __msan_poison(&act.mask, 1);
29 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8);
30 #else
31 // Uninit past the end of the mask is ignored.
32 __msan_poison(((char *)&act.mask) + 5, 1);
33 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 5);
34
35 memset(&act, 0, sizeof(act));
36 __msan_poison(&oldact, sizeof(oldact));
37 __sanitizer_syscall_post_rt_sigaction(0, SIGUSR1, &act, &oldact, 5);
38 assert(__msan_test_shadow(&oldact, sizeof(oldact)) == sizeof(long)*3 + 5);
39 #endif
40 }
41