2019-04-29 21:25:05 +00:00
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// Copyright 2018 The gVisor Authors.
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2018-12-10 22:41:40 +00:00
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <cerrno>
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#include <csignal>
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#include "gtest/gtest.h"
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#include "test/util/cleanup.h"
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#include "test/util/logging.h"
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#include "test/util/posix_error.h"
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#include "test/util/signal_util.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// saved_info is set by the handler.
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siginfo_t saved_info;
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// has_saved_info is set to true by the handler.
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volatile bool has_saved_info;
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void SigHandler(int sig, siginfo_t* info, void* context) {
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// Copy to the given info.
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saved_info = *info;
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has_saved_info = true;
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}
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void ClearSavedInfo() {
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// Clear the cached info.
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memset(&saved_info, 0, sizeof(saved_info));
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has_saved_info = false;
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}
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PosixErrorOr<Cleanup> SetupSignalHandler(int sig) {
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struct sigaction sa;
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sa.sa_sigaction = SigHandler;
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sigfillset(&sa.sa_mask);
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sa.sa_flags = SA_SIGINFO;
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return ScopedSigaction(sig, sa);
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}
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class RtSignalTest : public ::testing::Test {
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protected:
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void SetUp() override {
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action_cleanup_ = ASSERT_NO_ERRNO_AND_VALUE(SetupSignalHandler(SIGUSR1));
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mask_cleanup_ =
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ASSERT_NO_ERRNO_AND_VALUE(ScopedSignalMask(SIG_UNBLOCK, SIGUSR1));
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}
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void TearDown() override { ClearSavedInfo(); }
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private:
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Cleanup action_cleanup_;
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Cleanup mask_cleanup_;
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};
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static int rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t* uinfo) {
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int ret;
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do {
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2019-04-29 21:03:04 +00:00
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// NOTE(b/25434735): rt_sigqueueinfo(2) could return EAGAIN for RT signals.
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2018-12-10 22:41:40 +00:00
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ret = syscall(SYS_rt_sigqueueinfo, tgid, sig, uinfo);
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} while (ret == -1 && errno == EAGAIN);
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return ret;
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}
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TEST_F(RtSignalTest, InvalidTID) {
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siginfo_t uinfo;
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// Depending on the kernel version, these calls may fail with
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// ESRCH (goobunutu machines) or EPERM (production machines). Thus,
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// the test simply ensures that they do fail.
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EXPECT_THAT(rt_sigqueueinfo(-1, SIGUSR1, &uinfo), SyscallFails());
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EXPECT_FALSE(has_saved_info);
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EXPECT_THAT(rt_sigqueueinfo(0, SIGUSR1, &uinfo), SyscallFails());
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EXPECT_FALSE(has_saved_info);
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}
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TEST_F(RtSignalTest, InvalidCodes) {
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siginfo_t uinfo;
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// We need a child for the code checks to apply. If the process is delivering
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// to itself, then it can use whatever codes it wants and they will go
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// through.
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pid_t child = fork();
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if (child == 0) {
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_exit(1);
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}
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ASSERT_THAT(child, SyscallSucceeds());
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// These are not allowed for child processes.
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uinfo.si_code = 0; // SI_USER.
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EXPECT_THAT(rt_sigqueueinfo(child, SIGUSR1, &uinfo),
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SyscallFailsWithErrno(EPERM));
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uinfo.si_code = 0x80; // SI_KERNEL.
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EXPECT_THAT(rt_sigqueueinfo(child, SIGUSR1, &uinfo),
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SyscallFailsWithErrno(EPERM));
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uinfo.si_code = -6; // SI_TKILL.
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EXPECT_THAT(rt_sigqueueinfo(child, SIGUSR1, &uinfo),
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SyscallFailsWithErrno(EPERM));
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uinfo.si_code = -1; // SI_QUEUE (allowed).
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EXPECT_THAT(rt_sigqueueinfo(child, SIGUSR1, &uinfo), SyscallSucceeds());
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// Join the child process.
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EXPECT_THAT(waitpid(child, nullptr, 0), SyscallSucceeds());
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}
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TEST_F(RtSignalTest, ValueDelivered) {
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siginfo_t uinfo;
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uinfo.si_code = -1; // SI_QUEUE (allowed).
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uinfo.si_errno = 0x1234;
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EXPECT_EQ(saved_info.si_errno, 0x0);
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EXPECT_THAT(rt_sigqueueinfo(getpid(), SIGUSR1, &uinfo), SyscallSucceeds());
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EXPECT_TRUE(has_saved_info);
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EXPECT_EQ(saved_info.si_errno, 0x1234);
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}
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TEST_F(RtSignalTest, SignoMatch) {
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auto action2_cleanup = ASSERT_NO_ERRNO_AND_VALUE(SetupSignalHandler(SIGUSR2));
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auto mask2_cleanup =
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ASSERT_NO_ERRNO_AND_VALUE(ScopedSignalMask(SIG_UNBLOCK, SIGUSR2));
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siginfo_t uinfo;
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uinfo.si_code = -1; // SI_QUEUE (allowed).
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EXPECT_THAT(rt_sigqueueinfo(getpid(), SIGUSR1, &uinfo), SyscallSucceeds());
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EXPECT_TRUE(has_saved_info);
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EXPECT_EQ(saved_info.si_signo, SIGUSR1);
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ClearSavedInfo();
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EXPECT_THAT(rt_sigqueueinfo(getpid(), SIGUSR2, &uinfo), SyscallSucceeds());
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EXPECT_TRUE(has_saved_info);
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EXPECT_EQ(saved_info.si_signo, SIGUSR2);
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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int main(int argc, char** argv) {
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// These tests depend on delivering SIGUSR1/2 to the main thread (so they can
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// synchronously check has_saved_info). Block these so that any other threads
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// created by TestInit will also have them blocked.
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sigset_t set;
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sigemptyset(&set);
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sigaddset(&set, SIGUSR1);
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sigaddset(&set, SIGUSR2);
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TEST_PCHECK(sigprocmask(SIG_BLOCK, &set, nullptr) == 0);
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gvisor::testing::TestInit(&argc, &argv);
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return RUN_ALL_TESTS();
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}
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