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| // RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t
| //
| // Test that va_arg shadow from a signal handler does not leak outside.
|
| #include <signal.h>
| #include <stdarg.h>
| #include <sanitizer/msan_interface.h>
| #include <assert.h>
| #include <sys/time.h>
| #include <stdio.h>
|
| const int kSigCnt = 200;
|
| void f(bool poisoned, int n, ...) {
| va_list vl;
| va_start(vl, n);
| for (int i = 0; i < n; ++i) {
| void *p = va_arg(vl, void *);
| if (!poisoned)
| assert(__msan_test_shadow(&p, sizeof(p)) == -1);
| }
| va_end(vl);
| }
|
| int sigcnt;
|
| void SignalHandler(int signo) {
| assert(signo == SIGPROF);
| void *p;
| void **volatile q = &p;
| f(true, 10,
| *q, *q, *q, *q, *q,
| *q, *q, *q, *q, *q);
| ++sigcnt;
| }
|
| int main() {
| signal(SIGPROF, SignalHandler);
|
| itimerval itv;
| itv.it_interval.tv_sec = 0;
| itv.it_interval.tv_usec = 100;
| itv.it_value.tv_sec = 0;
| itv.it_value.tv_usec = 100;
| setitimer(ITIMER_PROF, &itv, NULL);
|
| void *p;
| void **volatile q = &p;
|
| do {
| f(false, 20,
| nullptr, nullptr, nullptr, nullptr, nullptr,
| nullptr, nullptr, nullptr, nullptr, nullptr,
| nullptr, nullptr, nullptr, nullptr, nullptr,
| nullptr, nullptr, nullptr, nullptr, nullptr);
| f(true, 20,
| *q, *q, *q, *q, *q,
| *q, *q, *q, *q, *q,
| *q, *q, *q, *q, *q,
| *q, *q, *q, *q, *q);
| } while (sigcnt < kSigCnt);
|
| itv.it_interval.tv_sec = 0;
| itv.it_interval.tv_usec = 0;
| itv.it_value.tv_sec = 0;
| itv.it_value.tv_usec = 0;
| setitimer(ITIMER_PROF, &itv, NULL);
|
| signal(SIGPROF, SIG_DFL);
| return 0;
| }
|
|
