test/msan/chained_origin_with_signals.cc

   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 -m64 -O3 %s -o %t && \
   6 // RUN:     not %run %t >%t.out 2>&1
   7 // RUN: FileCheck %s < %t.out
   8
   9 #include <signal.h>
  10 #include <stdio.h>
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13
  14 volatile int x, y;
  15
  16 void SignalHandler(int signo) {
  17   y = x;
  18 }
  19
  20 int main(int argc, char *argv[]) {
  21   int volatile z;
  22   x = z;
  23
  24   signal(SIGUSR1, SignalHandler);
  25   kill(getpid(), SIGUSR1);
  26   signal(SIGUSR1, SIG_DFL);
  27
  28   return y;
  29 }
  30
  31 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
  32 // CHECK-NOT: in SignalHandler