1 // Check that stores in signal handlers are not recorded in origin history.
2 //
3 // Origin tracking uses ChainedOriginDepot that is not async signal safe, so we
4 // do not track origins inside signal handlers.
5 //
6 // RUN: %clangxx_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \
7 // RUN: %run %t >%t.out 2>&1
8 // RUN: FileCheck %s < %t.out
9 //
10 // RUN: %clangxx_dfsan -gmlt -mllvm -dfsan-instrument-with-call-threshold=0 -mllvm -dfsan-track-origins=1 %s -o %t && \
11 // RUN: %run %t >%t.out 2>&1
12 // RUN: FileCheck %s < %t.out
13 //
14 // REQUIRES: x86_64-target-arch
15
16 #include <sanitizer/dfsan_interface.h>
17
18 #include <signal.h>
19 #include <string.h>
20 #include <sys/types.h>
21 #include <unistd.h>
22
23 int x, y, u;
24
SignalHandler(int signo)25 void SignalHandler(int signo) {
26 y = x;
27 memcpy(&u, &y, sizeof(int));
28 }
29
main(int argc,char * argv[])30 int main(int argc, char *argv[]) {
31 int z = 0;
32 dfsan_set_label(8, &z, sizeof(z));
33 x = z;
34
35 signal(SIGHUP, SignalHandler);
36 kill(getpid(), SIGHUP);
37 signal(SIGHUP, SIG_DFL);
38
39 dfsan_print_origin_trace(&u, nullptr);
40 return 0;
41 }
42
43 // CHECK: Taint value 0x8 {{.*}} origin tracking ()
44 // CHECK: Origin value: {{.*}}, Taint value was stored to memory at
45 // CHECK-NOT: {{.*}} in SignalHandler.dfsan {{.*}}origin_with_signals.cpp{{.*}}
46
47 // CHECK: #0 {{.*}} in main {{.*}}origin_with_signals.cpp:[[@LINE-14]]
48
49 // CHECK: Origin value: {{.*}}, Taint value was created at
50 // CHECK: #0 {{.*}} in main {{.*}}origin_with_signals.cpp:[[@LINE-18]]
51