1 // Check that stores in signal handlers are not recorded in origin history.
2 // This is, in fact, undesired behavior caused by our chained origins
3 // implementation being not async-signal-safe.
4
5 // RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
6 // RUN: not %run %t >%t.out 2>&1
7 // RUN: FileCheck %s < %t.out
8
9 // RUN: %clangxx_msan -mllvm -msan-instrumentation-with-call-threshold=0 -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
10 // RUN: not %run %t >%t.out 2>&1
11 // RUN: FileCheck %s < %t.out
12
13 #include <signal.h>
14 #include <stdio.h>
15 #include <sys/types.h>
16 #include <unistd.h>
17
18 volatile int x, y;
19
SignalHandler(int signo)20 void SignalHandler(int signo) {
21 y = x;
22 }
23
main(int argc,char * argv[])24 int main(int argc, char *argv[]) {
25 int volatile z;
26 x = z;
27
28 signal(SIGHUP, SignalHandler);
29 kill(getpid(), SIGHUP);
30 signal(SIGHUP, SIG_DFL);
31
32 return y;
33 }
34
35 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
36 // CHECK-NOT: in SignalHandler
37