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-rw-r--r--test/syscalls/linux/sigtimedwait.cc324
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diff --git a/test/syscalls/linux/sigtimedwait.cc b/test/syscalls/linux/sigtimedwait.cc
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--- a/test/syscalls/linux/sigtimedwait.cc
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-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include <sys/wait.h>
-#include <unistd.h>
-
-#include "gtest/gtest.h"
-#include "absl/time/clock.h"
-#include "absl/time/time.h"
-#include "test/util/file_descriptor.h"
-#include "test/util/logging.h"
-#include "test/util/signal_util.h"
-#include "test/util/test_util.h"
-#include "test/util/thread_util.h"
-#include "test/util/timer_util.h"
-
-namespace gvisor {
-namespace testing {
-
-namespace {
-
-// N.B. main() blocks SIGALRM and SIGCHLD on all threads.
-
-constexpr int kAlarmSecs = 12;
-
-void NoopHandler(int sig, siginfo_t* info, void* context) {}
-
-TEST(SigtimedwaitTest, InvalidTimeout) {
- sigset_t mask;
- sigemptyset(&mask);
- struct timespec timeout = {0, 1000000001};
- EXPECT_THAT(sigtimedwait(&mask, nullptr, &timeout),
- SyscallFailsWithErrno(EINVAL));
- timeout = {-1, 0};
- EXPECT_THAT(sigtimedwait(&mask, nullptr, &timeout),
- SyscallFailsWithErrno(EINVAL));
- timeout = {0, -1};
- EXPECT_THAT(sigtimedwait(&mask, nullptr, &timeout),
- SyscallFailsWithErrno(EINVAL));
-}
-
-// No random save as the test relies on alarm timing. Cooperative save tests
-// already cover the save between alarm and wait.
-TEST(SigtimedwaitTest, AlarmReturnsAlarm_NoRandomSave) {
- struct itimerval itv = {};
- itv.it_value.tv_sec = kAlarmSecs;
- const auto itimer_cleanup =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedItimer(ITIMER_REAL, itv));
-
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, SIGALRM);
- siginfo_t info = {};
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, &info, nullptr),
- SyscallSucceedsWithValue(SIGALRM));
- EXPECT_EQ(SIGALRM, info.si_signo);
-}
-
-// No random save as the test relies on alarm timing. Cooperative save tests
-// already cover the save between alarm and wait.
-TEST(SigtimedwaitTest, NullTimeoutReturnsEINTR_NoRandomSave) {
- struct sigaction sa;
- sa.sa_sigaction = NoopHandler;
- sigfillset(&sa.sa_mask);
- sa.sa_flags = SA_SIGINFO;
- const auto action_cleanup =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(SIGALRM, sa));
-
- const auto mask_cleanup =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSignalMask(SIG_UNBLOCK, SIGALRM));
-
- struct itimerval itv = {};
- itv.it_value.tv_sec = kAlarmSecs;
- const auto itimer_cleanup =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedItimer(ITIMER_REAL, itv));
-
- sigset_t mask;
- sigemptyset(&mask);
- EXPECT_THAT(sigtimedwait(&mask, nullptr, nullptr),
- SyscallFailsWithErrno(EINTR));
-}
-
-TEST(SigtimedwaitTest, LegitTimeoutReturnsEAGAIN) {
- sigset_t mask;
- sigemptyset(&mask);
- struct timespec timeout = {1, 0}; // 1 second
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, nullptr, &timeout),
- SyscallFailsWithErrno(EAGAIN));
-}
-
-TEST(SigtimedwaitTest, ZeroTimeoutReturnsEAGAIN) {
- sigset_t mask;
- sigemptyset(&mask);
- struct timespec timeout = {0, 0}; // 0 second
- EXPECT_THAT(sigtimedwait(&mask, nullptr, &timeout),
- SyscallFailsWithErrno(EAGAIN));
-}
-
-TEST(SigtimedwaitTest, KillGeneratedSIGCHLD) {
- EXPECT_THAT(kill(getpid(), SIGCHLD), SyscallSucceeds());
-
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, SIGCHLD);
- struct timespec ts = {5, 0};
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, nullptr, &ts),
- SyscallSucceedsWithValue(SIGCHLD));
-}
-
-TEST(SigtimedwaitTest, ChildExitGeneratedSIGCHLD) {
- pid_t pid = fork();
- if (pid == 0) {
- _exit(0);
- }
- ASSERT_THAT(pid, SyscallSucceeds());
-
- int status;
- EXPECT_THAT(waitpid(pid, &status, 0), SyscallSucceedsWithValue(pid));
- EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0) << status;
-
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, SIGCHLD);
- struct timespec ts = {5, 0};
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, nullptr, &ts),
- SyscallSucceedsWithValue(SIGCHLD));
-}
-
-TEST(SigtimedwaitTest, ChildExitGeneratedSIGCHLDWithHandler) {
- // Setup handler for SIGCHLD, but don't unblock it.
- struct sigaction sa;
- sa.sa_sigaction = NoopHandler;
- sigfillset(&sa.sa_mask);
- sa.sa_flags = SA_SIGINFO;
- const auto action_cleanup =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(SIGCHLD, sa));
-
- pid_t pid = fork();
- if (pid == 0) {
- _exit(0);
- }
- ASSERT_THAT(pid, SyscallSucceeds());
-
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, SIGCHLD);
- struct timespec ts = {5, 0};
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, nullptr, &ts),
- SyscallSucceedsWithValue(SIGCHLD));
-
- int status;
- EXPECT_THAT(waitpid(pid, &status, 0), SyscallSucceedsWithValue(pid));
- EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0) << status;
-}
-
-// sigtimedwait cannot catch SIGKILL.
-TEST(SigtimedwaitTest, SIGKILLUncaught) {
- // This is a regression test for sigtimedwait dequeuing SIGKILLs, thus
- // preventing the task from exiting.
- //
- // The explanation below is specific to behavior in gVisor. The Linux behavior
- // here is irrelevant because without a bug that prevents delivery of SIGKILL,
- // none of this behavior is visible (in Linux or gVisor).
- //
- // SIGKILL is rather intrusive. Simply sending the SIGKILL marks
- // ThreadGroup.exitStatus as exiting with SIGKILL, before the SIGKILL is even
- // delivered.
- //
- // As a result, we cannot simply exit the child with a different exit code if
- // it survives and expect to see that code in waitpid because:
- // 1. PrepareGroupExit will override Task.exitStatus with
- // ThreadGroup.exitStatus.
- // 2. waitpid(2) will always return ThreadGroup.exitStatus rather than
- // Task.exitStatus.
- //
- // We could use exit(2) to set Task.exitStatus without override, and a SIGCHLD
- // handler to receive Task.exitStatus in the parent, but with that much
- // test complexity, it is cleaner to simply use a pipe to notify the parent
- // that we survived.
- constexpr auto kSigtimedwaitSetupTime = absl::Seconds(2);
-
- int pipe_fds[2];
- ASSERT_THAT(pipe(pipe_fds), SyscallSucceeds());
- FileDescriptor rfd(pipe_fds[0]);
- FileDescriptor wfd(pipe_fds[1]);
-
- pid_t pid = fork();
- if (pid == 0) {
- rfd.reset();
-
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, SIGKILL);
- RetryEINTR(sigtimedwait)(&mask, nullptr, nullptr);
-
- // Survived.
- char c = 'a';
- TEST_PCHECK(WriteFd(wfd.get(), &c, 1) == 1);
- _exit(1);
- }
- ASSERT_THAT(pid, SyscallSucceeds());
-
- wfd.reset();
-
- // Wait for child to block in sigtimedwait, then kill it.
- absl::SleepFor(kSigtimedwaitSetupTime);
-
- // Sending SIGKILL will attempt to enqueue the signal twice: once in the
- // normal signal sending path, and once to all Tasks in the ThreadGroup when
- // applying SIGKILL side-effects.
- //
- // If we use kill(2), the former will be on the ThreadGroup signal queue and
- // the latter will be on the Task signal queue. sigtimedwait can only dequeue
- // one signal, so the other would kill the Task, masking bugs.
- //
- // If we use tkill(2), the former will be on the Task signal queue and the
- // latter will be dropped as a duplicate. Then sigtimedwait can theoretically
- // dequeue the single SIGKILL.
- EXPECT_THAT(syscall(SYS_tkill, pid, SIGKILL), SyscallSucceeds());
-
- int status;
- EXPECT_THAT(RetryEINTR(waitpid)(pid, &status, 0),
- SyscallSucceedsWithValue(pid));
- EXPECT_TRUE(WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL) << status;
-
- // Child shouldn't have survived.
- char c;
- EXPECT_THAT(ReadFd(rfd.get(), &c, 1), SyscallSucceedsWithValue(0));
-}
-
-TEST(SigtimedwaitTest, IgnoredUnmaskedSignal) {
- constexpr int kSigno = SIGUSR1;
- constexpr auto kSigtimedwaitSetupTime = absl::Seconds(2);
- constexpr auto kSigtimedwaitTimeout = absl::Seconds(5);
- ASSERT_GT(kSigtimedwaitTimeout, kSigtimedwaitSetupTime);
-
- // Ensure that kSigno is ignored, and unmasked on this thread.
- struct sigaction sa = {};
- sa.sa_handler = SIG_IGN;
- const auto scoped_sigaction =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(kSigno, sa));
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, kSigno);
- auto scoped_sigmask =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSignalMask(SIG_UNBLOCK, mask));
-
- // Create a thread which will send us kSigno while we are blocked in
- // sigtimedwait.
- pid_t tid = gettid();
- ScopedThread sigthread([&] {
- absl::SleepFor(kSigtimedwaitSetupTime);
- EXPECT_THAT(tgkill(getpid(), tid, kSigno), SyscallSucceeds());
- });
-
- // sigtimedwait should not observe kSigno since it is ignored and already
- // unmasked, causing it to be dropped before it is enqueued.
- struct timespec timeout_ts = absl::ToTimespec(kSigtimedwaitTimeout);
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, nullptr, &timeout_ts),
- SyscallFailsWithErrno(EAGAIN));
-}
-
-TEST(SigtimedwaitTest, IgnoredMaskedSignal) {
- constexpr int kSigno = SIGUSR1;
- constexpr auto kSigtimedwaitSetupTime = absl::Seconds(2);
- constexpr auto kSigtimedwaitTimeout = absl::Seconds(5);
- ASSERT_GT(kSigtimedwaitTimeout, kSigtimedwaitSetupTime);
-
- // Ensure that kSigno is ignored, and masked on this thread.
- struct sigaction sa = {};
- sa.sa_handler = SIG_IGN;
- const auto scoped_sigaction =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(kSigno, sa));
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, kSigno);
- auto scoped_sigmask =
- ASSERT_NO_ERRNO_AND_VALUE(ScopedSignalMask(SIG_BLOCK, mask));
-
- // Create a thread which will send us kSigno while we are blocked in
- // sigtimedwait.
- pid_t tid = gettid();
- ScopedThread sigthread([&] {
- absl::SleepFor(kSigtimedwaitSetupTime);
- EXPECT_THAT(tgkill(getpid(), tid, kSigno), SyscallSucceeds());
- });
-
- // sigtimedwait should observe kSigno since it is normally masked, causing it
- // to be enqueued despite being ignored.
- struct timespec timeout_ts = absl::ToTimespec(kSigtimedwaitTimeout);
- EXPECT_THAT(RetryEINTR(sigtimedwait)(&mask, nullptr, &timeout_ts),
- SyscallSucceedsWithValue(kSigno));
-}
-
-} // namespace
-
-} // namespace testing
-} // namespace gvisor
-
-int main(int argc, char** argv) {
- // These tests depend on delivering SIGALRM/SIGCHLD to the main thread or in
- // sigtimedwait. Block them so that any other threads created by TestInit will
- // also have them blocked.
- sigset_t set;
- sigemptyset(&set);
- sigaddset(&set, SIGALRM);
- sigaddset(&set, SIGCHLD);
- TEST_PCHECK(sigprocmask(SIG_BLOCK, &set, nullptr) == 0);
-
- gvisor::testing::TestInit(&argc, &argv);
-
- return RUN_ALL_TESTS();
-}
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