1 // RUN: %clangxx_msan -fno-sanitize-memory-param-retval -std=c++11 -O0 %s -o %t && %run %t
2 //
3 // Test that va_arg shadow from a signal handler does not leak outside.
4
5 // Reported deadly signal due to stack-overflow
6 // XFAIL: target={{.*netbsd.*}}
7
8 #include <signal.h>
9 #include <stdarg.h>
10 #include <sanitizer/msan_interface.h>
11 #include <assert.h>
12 #include <sys/time.h>
13 #include <stdio.h>
14
15 const int kSigCnt = 200;
16
f(bool poisoned,int n,...)17 void f(bool poisoned, int n, ...) {
18 va_list vl;
19 va_start(vl, n);
20 for (int i = 0; i < n; ++i) {
21 void *p = va_arg(vl, void *);
22 if (!poisoned)
23 assert(__msan_test_shadow(&p, sizeof(p)) == -1);
24 }
25 va_end(vl);
26 }
27
28 int sigcnt;
29
SignalHandler(int signo)30 void SignalHandler(int signo) {
31 assert(signo == SIGPROF);
32 void *p;
33 void **volatile q = &p;
34 f(true, 10,
35 *q, *q, *q, *q, *q,
36 *q, *q, *q, *q, *q);
37 ++sigcnt;
38 }
39
main()40 int main() {
41 signal(SIGPROF, SignalHandler);
42
43 itimerval itv;
44 itv.it_interval.tv_sec = 0;
45 itv.it_interval.tv_usec = 100;
46 itv.it_value.tv_sec = 0;
47 itv.it_value.tv_usec = 100;
48 setitimer(ITIMER_PROF, &itv, NULL);
49
50 void *p;
51 void **volatile q = &p;
52
53 do {
54 f(false, 20,
55 nullptr, nullptr, nullptr, nullptr, nullptr,
56 nullptr, nullptr, nullptr, nullptr, nullptr,
57 nullptr, nullptr, nullptr, nullptr, nullptr,
58 nullptr, nullptr, nullptr, nullptr, nullptr);
59 f(true, 20,
60 *q, *q, *q, *q, *q,
61 *q, *q, *q, *q, *q,
62 *q, *q, *q, *q, *q,
63 *q, *q, *q, *q, *q);
64 } while (sigcnt < kSigCnt);
65
66 itv.it_interval.tv_sec = 0;
67 itv.it_interval.tv_usec = 0;
68 itv.it_value.tv_sec = 0;
69 itv.it_value.tv_usec = 0;
70 setitimer(ITIMER_PROF, &itv, NULL);
71
72 signal(SIGPROF, SIG_DFL);
73 return 0;
74 }
75