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// clang-format off
// RUN: %clangxx -std=c++11 %s -o %t
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=1 not %run %t 2>&1 | FileCheck %s
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=2 not %run %t 2>&1 | FileCheck %s
// RUN: %clangxx -std=c++11 -DTEST_INSTALL_SIG_HANDLER %s -o %t
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-HANDLER
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=1 not %run %t 2>&1 | FileCheck %s
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=2 not %run %t 2>&1 | FileCheck %s
// RUN: %clangxx -std=c++11 -DTEST_INSTALL_SIG_ACTION %s -o %t
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-ACTION
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=1 not %run %t 2>&1 | FileCheck %s
// RUN: env LD_PRELOAD=%shared_libasan %env_asan_opts=handle_segv=2 not %run %t 2>&1 | FileCheck %s
// REQUIRES: asan-dynamic-runtime
// This way of setting LD_PRELOAD does not work with Android test runner.
// REQUIRES: !android
// clang-format on
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
const char *handler = nullptr;
void SigHandler(int signum) { handler = "TestSigHandler"; }
void SigAction(int, siginfo_t *, void *) { handler = "TestSigAction"; }
struct KernelSigaction {
#if defined(__mips__)
unsigned long flags;
__sighandler_t handler;
#else
__sighandler_t handler;
unsigned long flags;
#endif
void (*restorer)();
char unused[1024];
};
#if defined(__x86_64__)
extern "C" void restorer();
asm("restorer:mov $15,%rax\nsyscall");
#endif
int InternalSigaction(int sig, KernelSigaction *act, KernelSigaction *oact) {
if (act) {
#if defined(__x86_64__)
act->flags |= 0x04000000;
act->restorer = &restorer;
#endif
}
return syscall(__NR_rt_sigaction, sig, act, oact, NSIG / 8);
}
struct KernelSigaction pre_asan = {};
static void Init() {
int res = InternalSigaction(SIGSEGV, nullptr, &pre_asan);
assert(res >= 0);
assert(pre_asan.handler == SIG_DFL || pre_asan.handler == SIG_IGN);
#if defined(TEST_INSTALL_SIG_HANDLER)
pre_asan = {};
pre_asan.handler = &SigHandler;
res = InternalSigaction(SIGSEGV, &pre_asan, nullptr);
assert(res >= 0);
#elif defined(TEST_INSTALL_SIG_ACTION)
pre_asan = {};
pre_asan.flags = SA_SIGINFO | SA_NODEFER;
pre_asan.handler = (__sighandler_t)&SigAction;
res = InternalSigaction(SIGSEGV, &pre_asan, nullptr);
assert(res >= 0);
#endif
}
__attribute__((section(".preinit_array"), used))
void (*__local_test_preinit)(void) = Init;
bool ExpectUserHandler() {
#if defined(TEST_INSTALL_SIG_HANDLER) || defined(TEST_INSTALL_SIG_ACTION)
return !strcmp(getenv("ASAN_OPTIONS"), "handle_segv=0");
#endif
return false;
}
int main(int argc, char *argv[]) {
KernelSigaction post_asan = {};
InternalSigaction(SIGSEGV, nullptr, &post_asan);
assert(post_asan.handler != SIG_DFL);
assert(post_asan.handler != SIG_IGN);
assert(ExpectUserHandler() ==
(post_asan.handler == pre_asan.handler));
raise(SIGSEGV);
printf("%s\n", handler);
return 1;
}
// CHECK-NOT: TestSig
// CHECK: AddressSanitizer:DEADLYSIGNAL
// CHECK-HANDLER-NOT: AddressSanitizer:DEADLYSIGNAL
// CHECK-HANDLER: TestSigHandler
// CHECK-ACTION-NOT: AddressSanitizer:DEADLYSIGNAL
// CHECK-ACTION: TestSigAction
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