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 13struct my_kernel_sigaction { 14 long handler, flags, restorer; 15 uint64_t mask[20]; // larger than any known platform 16}; 17 18int 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