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92a42be0 SL |
1 | // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
2 | ||
3 | // Test case for longjumping out of signal handler: | |
3157f602 | 4 | // https://github.com/google/sanitizers/issues/482 |
92a42be0 | 5 | |
3157f602 XL |
6 | // This test fails on powerpc64 BE (VMA=44), a segmentation fault |
7 | // error happens at the second assignment | |
8 | // "((volatile int *volatile)mem)[1] = 1". | |
9 | // XFAIL: powerpc64-unknown-linux-gnu | |
92a42be0 SL |
10 | |
11 | #include <setjmp.h> | |
12 | #include <signal.h> | |
13 | #include <stdlib.h> | |
14 | #include <stdio.h> | |
15 | #include <sys/mman.h> | |
16 | ||
3157f602 XL |
17 | #ifdef __APPLE__ |
18 | #define SIGNAL_TO_HANDLE SIGBUS | |
19 | #else | |
20 | #define SIGNAL_TO_HANDLE SIGSEGV | |
21 | #endif | |
22 | ||
92a42be0 SL |
23 | sigjmp_buf fault_jmp; |
24 | volatile int fault_expected; | |
25 | ||
26 | void sigfault_handler(int sig) { | |
27 | if (!fault_expected) | |
28 | abort(); | |
29 | ||
30 | /* just return from sighandler to proper place */ | |
31 | fault_expected = 0; | |
32 | siglongjmp(fault_jmp, 1); | |
33 | } | |
34 | ||
35 | #define MUST_FAULT(code) do { \ | |
36 | fault_expected = 1; \ | |
37 | if (!sigsetjmp(fault_jmp, 1)) { \ | |
38 | code; /* should pagefault -> sihandler does longjmp */ \ | |
39 | fprintf(stderr, "%s not faulted\n", #code); \ | |
40 | abort(); \ | |
41 | } else { \ | |
42 | fprintf(stderr, "%s faulted ok\n", #code); \ | |
43 | } \ | |
44 | } while (0) | |
45 | ||
46 | int main() { | |
47 | struct sigaction act; | |
48 | act.sa_handler = sigfault_handler; | |
49 | act.sa_flags = 0; | |
50 | if (sigemptyset(&act.sa_mask)) { | |
51 | perror("sigemptyset"); | |
52 | exit(1); | |
53 | } | |
54 | ||
3157f602 | 55 | if (sigaction(SIGNAL_TO_HANDLE, &act, NULL)) { |
92a42be0 SL |
56 | perror("sigaction"); |
57 | exit(1); | |
58 | } | |
59 | ||
60 | void *mem = mmap(0, 4096, PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
61 | -1, 0); | |
62 | ||
63 | MUST_FAULT(((volatile int *volatile)mem)[0] = 0); | |
64 | MUST_FAULT(((volatile int *volatile)mem)[1] = 1); | |
65 | MUST_FAULT(((volatile int *volatile)mem)[3] = 1); | |
66 | ||
67 | // Ensure that tsan does not think that we are | |
68 | // in a signal handler. | |
69 | void *volatile p = malloc(10); | |
70 | ((volatile int*)p)[1] = 1; | |
71 | free((void*)p); | |
72 | ||
73 | munmap(p, 4096); | |
74 | ||
75 | fprintf(stderr, "DONE\n"); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | // CHECK-NOT: WARNING: ThreadSanitizer | |
80 | // CHECK: DONE |