Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 1 | // RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 2 | // |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 3 | // Test that va_arg shadow from a signal handler does not leak outside. |
| 4 | |
| 5 | #include <signal.h> |
| 6 | #include <stdarg.h> |
| 7 | #include <sanitizer/msan_interface.h> |
| 8 | #include <assert.h> |
| 9 | #include <sys/time.h> |
| 10 | #include <stdio.h> |
| 11 | |
| 12 | const int kSigCnt = 200; |
| 13 | |
| 14 | void f(bool poisoned, int n, ...) { |
| 15 | va_list vl; |
| 16 | va_start(vl, n); |
| 17 | for (int i = 0; i < n; ++i) { |
| 18 | void *p = va_arg(vl, void *); |
| 19 | if (!poisoned) |
| 20 | assert(__msan_test_shadow(&p, sizeof(p)) == -1); |
| 21 | } |
| 22 | va_end(vl); |
| 23 | } |
| 24 | |
| 25 | int sigcnt; |
| 26 | |
| 27 | void SignalHandler(int signo) { |
| 28 | assert(signo == SIGPROF); |
| 29 | void *p; |
| 30 | void **volatile q = &p; |
| 31 | f(true, 10, |
| 32 | *q, *q, *q, *q, *q, |
| 33 | *q, *q, *q, *q, *q); |
| 34 | ++sigcnt; |
| 35 | } |
| 36 | |
| 37 | int main() { |
| 38 | signal(SIGPROF, SignalHandler); |
| 39 | |
| 40 | itimerval itv; |
| 41 | itv.it_interval.tv_sec = 0; |
| 42 | itv.it_interval.tv_usec = 100; |
| 43 | itv.it_value.tv_sec = 0; |
| 44 | itv.it_value.tv_usec = 100; |
| 45 | setitimer(ITIMER_PROF, &itv, NULL); |
| 46 | |
| 47 | void *p; |
| 48 | void **volatile q = &p; |
| 49 | |
| 50 | do { |
| 51 | f(false, 20, |
| 52 | nullptr, nullptr, nullptr, nullptr, nullptr, |
| 53 | nullptr, nullptr, nullptr, nullptr, nullptr, |
| 54 | nullptr, nullptr, nullptr, nullptr, nullptr, |
| 55 | nullptr, nullptr, nullptr, nullptr, nullptr); |
| 56 | f(true, 20, |
| 57 | *q, *q, *q, *q, *q, |
| 58 | *q, *q, *q, *q, *q, |
| 59 | *q, *q, *q, *q, *q, |
| 60 | *q, *q, *q, *q, *q); |
| 61 | } while (sigcnt < kSigCnt); |
| 62 | |
| 63 | itv.it_interval.tv_sec = 0; |
| 64 | itv.it_interval.tv_usec = 0; |
| 65 | itv.it_value.tv_sec = 0; |
| 66 | itv.it_value.tv_usec = 0; |
| 67 | setitimer(ITIMER_PROF, &itv, NULL); |
| 68 | |
| 69 | signal(SIGPROF, SIG_DFL); |
| 70 | return 0; |
| 71 | } |