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Commit | Line | Data |
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5bcae85e SL |
1 | // RUN: %clang_esan_wset -O0 %s -o %t 2>&1 |
2 | // RUN: %run %t 2>&1 | FileCheck %s | |
3 | ||
4 | #include <assert.h> | |
5 | #include <setjmp.h> | |
6 | #include <signal.h> | |
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9 | #include <sys/mman.h> | |
10 | ||
11 | sigjmp_buf mark; | |
12 | ||
13 | static void SignalHandler(int Sig) { | |
14 | if (Sig == SIGSEGV) { | |
15 | fprintf(stderr, "Handling SIGSEGV for signal\n"); | |
16 | siglongjmp(mark, 1); | |
17 | } | |
18 | exit(1); | |
19 | } | |
20 | ||
21 | static void SigactionHandler(int Sig, siginfo_t *Info, void *Ctx) { | |
22 | if (Sig == SIGSEGV) { | |
23 | fprintf(stderr, "Handling SIGSEGV for sigaction\n"); | |
24 | siglongjmp(mark, 1); | |
25 | } | |
26 | exit(1); | |
27 | } | |
28 | ||
29 | int main(int argc, char **argv) { | |
30 | __sighandler_t Prior = signal(SIGSEGV, SignalHandler); | |
31 | assert(Prior == SIG_DFL); | |
32 | if (sigsetjmp(mark, 1) == 0) | |
33 | *((volatile int *)(ssize_t)argc) = 42; // Raise SIGSEGV | |
34 | fprintf(stderr, "Past longjmp for signal\n"); | |
35 | ||
36 | Prior = signal(SIGSEGV, SIG_DFL); | |
37 | assert(Prior == SignalHandler); | |
38 | ||
39 | struct sigaction SigAct; | |
40 | SigAct.sa_sigaction = SigactionHandler; | |
41 | int Res = sigfillset(&SigAct.sa_mask); | |
42 | assert(Res == 0); | |
43 | SigAct.sa_flags = SA_SIGINFO; | |
44 | Res = sigaction(SIGSEGV, &SigAct, NULL); | |
45 | assert(Res == 0); | |
46 | ||
47 | if (sigsetjmp(mark, 1) == 0) | |
48 | *((volatile int *)(ssize_t)argc) = 42; // Raise SIGSEGV | |
49 | fprintf(stderr, "Past longjmp for sigaction\n"); | |
50 | ||
51 | Res = sigaction(SIGSEGV, NULL, &SigAct); | |
52 | assert(Res == 0); | |
53 | assert(SigAct.sa_sigaction == SigactionHandler); | |
54 | ||
55 | // Test blocking SIGSEGV and raising a shadow fault. | |
56 | sigset_t Set; | |
57 | sigemptyset(&Set); | |
58 | sigaddset(&Set, SIGSEGV); | |
59 | Res = sigprocmask(SIG_BLOCK, &Set, NULL); | |
60 | // Make a large enough mapping that its start point will be before any | |
61 | // prior library-region shadow access. | |
62 | char *buf = (char *)mmap(0, 640*1024, PROT_READ | PROT_WRITE, | |
63 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
64 | buf[0] = 4; | |
65 | munmap(buf, 640*1024); | |
66 | fprintf(stderr, "Past blocked-SIGSEGV shadow fault\n"); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | // CHECK: Handling SIGSEGV for signal | |
71 | // CHECK-NEXT: Past longjmp for signal | |
72 | // CHECK-NEXT: Handling SIGSEGV for sigaction | |
73 | // CHECK-NEXT: Past longjmp for sigaction | |
74 | // CHECK-NEXT: Past blocked-SIGSEGV shadow fault | |
75 | // CHECK: {{.*}} EfficiencySanitizer: the total working set size: {{[0-9]+}} Bytes ({{[0-9][0-9]}} cache lines) |