1// RUN: %clangxx -std=c++11 %s -o %t
2// RUN: %env_asan_opts=handle_segv=1 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
3// RUN: %env_asan_opts=handle_segv=2 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
4
5// RUN: %clangxx -std=c++11 -DTEST_INSTALL_SIG_HANDLER %s -o %t
6// RUN: %env_asan_opts=handle_segv=0 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-HANDLER
7// RUN: %env_asan_opts=handle_segv=1 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
8// RUN: %env_asan_opts=handle_segv=2 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
9
10// RUN: %clangxx -std=c++11 -DTEST_INSTALL_SIG_ACTION %s -o %t
11// RUN: %env_asan_opts=handle_segv=0 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-ACTION
12// RUN: %env_asan_opts=handle_segv=1 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
13// RUN: %env_asan_opts=handle_segv=2 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
14
15// REQUIRES: asan-dynamic-runtime
16
17// This way of setting LD_PRELOAD does not work with Android test runner.
18// REQUIRES: !android
19
20#include <assert.h>
21#include <signal.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <sys/syscall.h>
26#include <unistd.h>
27
28const char *handler = nullptr;
29void SigHandler(int signum) { handler = "TestSigHandler"; }
30void SigAction(int, siginfo_t *, void *) { handler = "TestSigAction"; }
31
32struct KernelSigaction {
33
34#if defined(__mips__)
35 unsigned long flags;
36 __sighandler_t handler;
37#else
38 __sighandler_t handler;
39 unsigned long flags;
40#endif
41 void (*restorer)();
42 char unused[1024];
43};
44
45#if defined(__x86_64__)
46extern "C" void restorer();
47asm("restorer:mov $15,%rax\nsyscall");
48#endif
49
50int InternalSigaction(int sig, KernelSigaction *act, KernelSigaction *oact) {
51 if (act) {
52#if defined(__x86_64__)
53 act->flags |= 0x04000000;
54 act->restorer = &restorer;
55#endif
56 }
57 return syscall(__NR_rt_sigaction, sig, act, oact, NSIG / 8);
58}
59
60struct KernelSigaction pre_asan = {};
61
62static void Init() {
63 int res = InternalSigaction(SIGSEGV, act: nullptr, oact: &pre_asan);
64 assert(res >= 0);
65 assert(pre_asan.handler == SIG_DFL || pre_asan.handler == SIG_IGN);
66#if defined(TEST_INSTALL_SIG_HANDLER)
67 pre_asan = {};
68 pre_asan.handler = &SigHandler;
69 res = InternalSigaction(SIGSEGV, &pre_asan, nullptr);
70 assert(res >= 0);
71#elif defined(TEST_INSTALL_SIG_ACTION)
72 pre_asan = {};
73 pre_asan.flags = SA_SIGINFO | SA_NODEFER;
74 pre_asan.handler = (__sighandler_t)&SigAction;
75 res = InternalSigaction(SIGSEGV, &pre_asan, nullptr);
76 assert(res >= 0);
77#endif
78}
79
80__attribute__((section(".preinit_array"), used))
81void (*__local_test_preinit)(void) = Init;
82
83bool ExpectUserHandler() {
84#if defined(TEST_INSTALL_SIG_HANDLER) || defined(TEST_INSTALL_SIG_ACTION)
85 return !strcmp(getenv("ASAN_OPTIONS"), "handle_segv=0");
86#endif
87 return false;
88}
89
90int main(int argc, char *argv[]) {
91 KernelSigaction post_asan = {};
92 InternalSigaction(SIGSEGV, act: nullptr, oact: &post_asan);
93
94 assert(post_asan.handler != SIG_DFL);
95 assert(post_asan.handler != SIG_IGN);
96 assert(ExpectUserHandler() ==
97 (post_asan.handler == pre_asan.handler));
98
99 raise(SIGSEGV);
100 printf(format: "%s\n", handler);
101 return 1;
102}
103
104// CHECK-NOT: TestSig
105// CHECK: AddressSanitizer:DEADLYSIGNAL
106
107// CHECK-HANDLER-NOT: AddressSanitizer:DEADLYSIGNAL
108// CHECK-HANDLER: TestSigHandler
109
110// CHECK-ACTION-NOT: AddressSanitizer:DEADLYSIGNAL
111// CHECK-ACTION: TestSigAction
112

source code of compiler-rt/test/asan/TestCases/Linux/preinstalled_signal.cpp