compiler-rt/test/dfsan/origin_with_sigactions.c

   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: %clang_dfsan -gmlt -DUSE_SIGNAL_ACTION -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: %clang_dfsan -gmlt -DUSE_SIGNAL_ACTION -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 // RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \
  15 // RUN:     %run %t >%t.out 2>&1
  16 // RUN: FileCheck %s < %t.out
  17 //
  18 // RUN: %clang_dfsan -gmlt -mllvm -dfsan-instrument-with-call-threshold=0 -mllvm -dfsan-track-origins=1 %s -o %t && \
  19 // RUN:     %run %t >%t.out 2>&1
  20 // RUN: FileCheck %s < %t.out
  21
  22 #include <sanitizer/dfsan_interface.h>
  23
  24 #include <assert.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #include <unistd.h>
  29
  30 int x, y, u;
  31
  32 void CopyXtoYtoU() {
  33   y = x;
  34   memcpy(&u, &y, sizeof(int));
  35 }
  36
  37 void SignalHandler(int signo) {
  38   CopyXtoYtoU();
  39 }
  40
  41 void SignalAction(int signo, siginfo_t *si, void *uc) {
  42   CopyXtoYtoU();
  43 }
  44
  45 int main(int argc, char *argv[]) {
  46   int z = 1;
  47   dfsan_set_label(8, &z, sizeof(z));
  48   x = z;
  49
  50   struct sigaction psa = {};
  51 #ifdef USE_SIGNAL_ACTION
  52   psa.sa_flags = SA_SIGINFO;
  53   psa.sa_sigaction = SignalAction;
  54 #else
  55   psa.sa_flags = 0;
  56   psa.sa_handler = SignalHandler;
  57 #endif
  58   sigaction(SIGHUP, &psa, NULL);
  59   kill(getpid(), SIGHUP);
  60   signal(SIGHUP, SIG_DFL);
  61
  62   assert(x == 1);
  63   assert(y == 1);
  64   assert(u == 1);
  65
  66   dfsan_print_origin_trace(&u, NULL);
  67   return 0;
  68 }
  69
  70 // CHECK: Taint value 0x8 {{.*}} origin tracking ()
  71 // CHECK: Origin value: {{.*}}, Taint value was stored to memory at
  72 // CHECK-NOT: {{.*}} in CopyXtoYtoU.dfsan {{.*}}origin_with_sigactions.c{{.*}}
  73
  74 // CHECK: #0 {{.*}} in main {{.*}}origin_with_sigactions.c:[[@LINE-26]]
  75
  76 // CHECK: Origin value: {{.*}}, Taint value was created at
  77 // CHECK: #0 {{.*}} in main {{.*}}origin_with_sigactions.c:[[@LINE-30]]