/*
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* Copyright (C) 2018 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <dlfcn.h>
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#include <pthread.h>
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#include <signal.h>
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#include <sys/syscall.h>
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#include <functional>
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#include <gtest/gtest.h>
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#include "sigchain.h"
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#if !defined(__BIONIC__)
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using sigset64_t = sigset_t;
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static int sigemptyset64(sigset64_t* set) {
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return sigemptyset(set);
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}
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static int sigismember64(sigset64_t* set, int member) {
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return sigismember(set, member);
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}
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#endif
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static int RealSigprocmask(int how, const sigset64_t* new_sigset, sigset64_t* old_sigset) {
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// glibc's sigset_t is overly large, so sizeof(*new_sigset) doesn't work.
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return syscall(__NR_rt_sigprocmask, how, new_sigset, old_sigset, NSIG/8);
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}
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class SigchainTest : public ::testing::Test {
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void SetUp() final {
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art::AddSpecialSignalHandlerFn(SIGSEGV, &action);
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}
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void TearDown() final {
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art::RemoveSpecialSignalHandlerFn(SIGSEGV, action.sc_sigaction);
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}
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art::SigchainAction action = {
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.sc_sigaction = [](int, siginfo_t* info, void*) -> bool {
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return info->si_value.sival_ptr;
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},
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.sc_mask = {},
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.sc_flags = 0,
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};
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protected:
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void RaiseHandled() {
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sigval_t value;
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value.sival_ptr = &value;
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pthread_sigqueue(pthread_self(), SIGSEGV, value);
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}
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void RaiseUnhandled() {
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sigval_t value;
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value.sival_ptr = nullptr;
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pthread_sigqueue(pthread_self(), SIGSEGV, value);
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}
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};
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static void TestSignalBlocking(const std::function<void()>& fn) {
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// Unblock SIGSEGV, make sure it stays unblocked.
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sigset64_t mask;
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sigemptyset64(&mask);
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ASSERT_EQ(0, RealSigprocmask(SIG_SETMASK, &mask, nullptr)) << strerror(errno);
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fn();
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if (testing::Test::HasFatalFailure()) return;
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ASSERT_EQ(0, RealSigprocmask(SIG_SETMASK, nullptr, &mask));
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ASSERT_FALSE(sigismember64(&mask, SIGSEGV));
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}
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TEST_F(SigchainTest, sigprocmask_setmask) {
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TestSignalBlocking([]() {
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sigset_t mask;
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sigfillset(&mask);
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ASSERT_EQ(0, sigprocmask(SIG_SETMASK, &mask, nullptr));
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});
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}
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TEST_F(SigchainTest, sigprocmask_block) {
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TestSignalBlocking([]() {
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sigset_t mask;
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sigfillset(&mask);
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ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &mask, nullptr));
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});
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}
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// bionic-only wide variants for LP32.
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#if defined(__BIONIC__)
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TEST_F(SigchainTest, sigprocmask64_setmask) {
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TestSignalBlocking([]() {
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sigset64_t mask;
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sigfillset64(&mask);
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ASSERT_EQ(0, sigprocmask64(SIG_SETMASK, &mask, nullptr));
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});
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}
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TEST_F(SigchainTest, sigprocmask64_block) {
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TestSignalBlocking([]() {
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sigset64_t mask;
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sigfillset64(&mask);
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ASSERT_EQ(0, sigprocmask64(SIG_BLOCK, &mask, nullptr));
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});
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}
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TEST_F(SigchainTest, pthread_sigmask64_setmask) {
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TestSignalBlocking([]() {
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sigset64_t mask;
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sigfillset64(&mask);
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ASSERT_EQ(0, pthread_sigmask64(SIG_SETMASK, &mask, nullptr));
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});
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}
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TEST_F(SigchainTest, pthread_sigmask64_block) {
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TestSignalBlocking([]() {
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sigset64_t mask;
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sigfillset64(&mask);
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ASSERT_EQ(0, pthread_sigmask64(SIG_BLOCK, &mask, nullptr));
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});
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}
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#endif
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// glibc doesn't implement most of these in terms of sigprocmask, which we rely on.
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#if defined(__BIONIC__)
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TEST_F(SigchainTest, pthread_sigmask_setmask) {
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TestSignalBlocking([]() {
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sigset_t mask;
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sigfillset(&mask);
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ASSERT_EQ(0, pthread_sigmask(SIG_SETMASK, &mask, nullptr));
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});
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}
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TEST_F(SigchainTest, pthread_sigmask_block) {
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TestSignalBlocking([]() {
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sigset_t mask;
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sigfillset(&mask);
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ASSERT_EQ(0, pthread_sigmask(SIG_BLOCK, &mask, nullptr));
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});
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}
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TEST_F(SigchainTest, sigset_mask) {
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TestSignalBlocking([]() {
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sigset(SIGSEGV, SIG_HOLD);
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});
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}
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TEST_F(SigchainTest, sighold) {
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TestSignalBlocking([]() {
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sighold(SIGSEGV);
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});
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}
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#if defined(__BIONIC__)
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// Not exposed via headers, but the symbols are available if you declare them yourself.
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extern "C" int sigblock(int);
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extern "C" int sigsetmask(int);
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#endif
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TEST_F(SigchainTest, sigblock) {
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TestSignalBlocking([]() {
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int mask = ~0U;
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ASSERT_EQ(0, sigblock(mask));
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});
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}
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TEST_F(SigchainTest, sigsetmask) {
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TestSignalBlocking([]() {
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int mask = ~0U;
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ASSERT_EQ(0, sigsetmask(mask));
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});
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}
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#endif
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// Make sure that we properly put ourselves back in front if we get circumvented.
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TEST_F(SigchainTest, EnsureFrontOfChain) {
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#if defined(__BIONIC__)
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constexpr char kLibcSoName[] = "libc.so";
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#elif defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ == 6
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constexpr char kLibcSoName[] = "libc.so.6";
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#else
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#error Unknown libc
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#endif
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void* libc = dlopen(kLibcSoName, RTLD_LAZY | RTLD_NOLOAD);
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ASSERT_TRUE(libc);
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static sig_atomic_t called = 0;
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struct sigaction action = {};
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action.sa_flags = SA_SIGINFO;
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action.sa_sigaction = [](int, siginfo_t*, void*) { called = 1; };
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ASSERT_EQ(0, sigaction(SIGSEGV, &action, nullptr));
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// Try before EnsureFrontOfChain.
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RaiseHandled();
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ASSERT_EQ(0, called);
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RaiseUnhandled();
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ASSERT_EQ(1, called);
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called = 0;
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// ...and after.
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art::EnsureFrontOfChain(SIGSEGV);
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ASSERT_EQ(0, called);
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called = 0;
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RaiseUnhandled();
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ASSERT_EQ(1, called);
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called = 0;
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}
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