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1 // RUN: %clangxx_dfsan %s -o %t && %run %t
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2 // RUN: %clangxx_dfsan -mllvm -dfsan-track-origins=1 %s -o %t && %run %t
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3 // RUN: %clangxx_dfsan -mllvm -dfsan-track-origins=1 -mllvm -dfsan-instrument-with-call-threshold=0 %s -o %t && %run %t
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221
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4 //
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5 // Test that the state of shadows from a sigaction handler are consistent.
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6 //
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7 // REQUIRES: x86_64-target-arch
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8
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9 #include <signal.h>
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10 #include <stdarg.h>
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11 #include <sanitizer/dfsan_interface.h>
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12 #include <assert.h>
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13 #include <sys/time.h>
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14 #include <stdio.h>
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15
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16 const int kSigCnt = 200;
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17 int x = 0;
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18
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19 __attribute__((noinline))
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20 int f(int a) {
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21 return a;
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22 }
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23
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24 __attribute__((noinline))
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25 void g() {
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26 int r = f(x);
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27 const dfsan_label r_label = dfsan_get_label(r);
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28 assert(r_label == 8 || r_label == 0);
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29 return;
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30 }
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31
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32 int sigcnt;
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33
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34 void SignalHandler(int signo) {
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35 assert(signo == SIGPROF);
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36 int a = 0;
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37 dfsan_set_label(4, &a, sizeof(a));
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38 (void)f(a);
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39 ++sigcnt;
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40 }
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41
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42 int main() {
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43 struct sigaction psa = {};
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44 psa.sa_handler = SignalHandler;
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45 int r = sigaction(SIGPROF, &psa, NULL);
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46
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47 itimerval itv;
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48 itv.it_interval.tv_sec = 0;
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49 itv.it_interval.tv_usec = 100;
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50 itv.it_value.tv_sec = 0;
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51 itv.it_value.tv_usec = 100;
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52 setitimer(ITIMER_PROF, &itv, NULL);
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53
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54 dfsan_set_label(8, &x, sizeof(x));
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55 do {
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56 g();
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57 } while (sigcnt < kSigCnt);
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58
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59 itv.it_interval.tv_sec = 0;
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60 itv.it_interval.tv_usec = 0;
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61 itv.it_value.tv_sec = 0;
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62 itv.it_value.tv_usec = 0;
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63 setitimer(ITIMER_PROF, &itv, NULL);
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64
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65 signal(SIGPROF, SIG_DFL);
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66 return 0;
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67 }
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