156 lines
5.5 KiB
C++
156 lines
5.5 KiB
C++
// Copyright 2018 Google LLC
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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 <poll.h>
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#include <signal.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "absl/time/time.h"
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#include "test/syscalls/linux/base_poll_test.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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// Linux and glibc have a different idea of the sizeof sigset_t. When calling
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// the syscall directly, use what the kernel expects.
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unsigned kSigsetSize = SIGRTMAX / 8;
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// Linux ppoll(2) differs from the glibc wrapper function in that Linux updates
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// the timeout with the amount of time remaining. In order to test this behavior
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// we need to use the syscall directly.
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int syscallPpoll(struct pollfd* fds, nfds_t nfds, struct timespec* timeout_ts,
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const sigset_t* sigmask, unsigned mask_size) {
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return syscall(SYS_ppoll, fds, nfds, timeout_ts, sigmask, mask_size);
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}
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class PpollTest : public BasePollTest {
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protected:
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void SetUp() override { BasePollTest::SetUp(); }
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void TearDown() override { BasePollTest::TearDown(); }
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};
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TEST_F(PpollTest, InvalidFds) {
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// fds is invalid because it's null, but we tell ppoll the length is non-zero.
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struct timespec timeout = {};
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sigset_t sigmask;
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TEST_PCHECK(sigemptyset(&sigmask) == 0);
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EXPECT_THAT(syscallPpoll(nullptr, 1, &timeout, &sigmask, kSigsetSize),
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SyscallFailsWithErrno(EFAULT));
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EXPECT_THAT(syscallPpoll(nullptr, -1, &timeout, &sigmask, kSigsetSize),
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SyscallFailsWithErrno(EINVAL));
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}
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// See that when fds is null, ppoll behaves like sleep.
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TEST_F(PpollTest, NullFds) {
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struct timespec timeout = absl::ToTimespec(absl::Milliseconds(10));
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ASSERT_THAT(syscallPpoll(nullptr, 0, &timeout, nullptr, 0),
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SyscallSucceeds());
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EXPECT_EQ(timeout.tv_sec, 0);
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EXPECT_EQ(timeout.tv_nsec, 0);
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}
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TEST_F(PpollTest, ZeroTimeout) {
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struct timespec timeout = {};
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ASSERT_THAT(syscallPpoll(nullptr, 0, &timeout, nullptr, 0),
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SyscallSucceeds());
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EXPECT_EQ(timeout.tv_sec, 0);
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EXPECT_EQ(timeout.tv_nsec, 0);
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}
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// If random S/R interrupts the ppoll, SIGALRM may be delivered before ppoll
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// restarts, causing the ppoll to hang forever.
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TEST_F(PpollTest, NoTimeout_NoRandomSave) {
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// When there's no timeout, ppoll may never return so set a timer.
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SetTimer(absl::Milliseconds(100));
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// See that we get interrupted by the timer.
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ASSERT_THAT(syscallPpoll(nullptr, 0, nullptr, nullptr, 0),
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SyscallFailsWithErrno(EINTR));
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EXPECT_TRUE(TimerFired());
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}
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TEST_F(PpollTest, InvalidTimeoutNegative) {
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struct timespec timeout = absl::ToTimespec(absl::Nanoseconds(-1));
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EXPECT_THAT(syscallPpoll(nullptr, 0, &timeout, nullptr, 0),
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SyscallFailsWithErrno(EINVAL));
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}
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TEST_F(PpollTest, InvalidTimeoutNotNormalized) {
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struct timespec timeout = {0, 1000000001};
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EXPECT_THAT(syscallPpoll(nullptr, 0, &timeout, nullptr, 0),
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SyscallFailsWithErrno(EINVAL));
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}
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TEST_F(PpollTest, InvalidMaskSize) {
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struct timespec timeout = {};
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sigset_t sigmask;
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TEST_PCHECK(sigemptyset(&sigmask) == 0);
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EXPECT_THAT(syscallPpoll(nullptr, 0, &timeout, &sigmask, 128),
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SyscallFailsWithErrno(EINVAL));
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}
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// Verify that signals blocked by the ppoll mask (that would otherwise be
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// allowed) do not interrupt ppoll.
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TEST_F(PpollTest, SignalMaskBlocksSignal) {
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absl::Duration duration(absl::Seconds(30));
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struct timespec timeout = absl::ToTimespec(duration);
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absl::Duration timer_duration(absl::Seconds(10));
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// Call with a mask that blocks SIGALRM. See that ppoll is not interrupted
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// (i.e. returns 0) and that upon completion, the timer has fired.
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sigset_t mask;
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ASSERT_THAT(sigprocmask(0, nullptr, &mask), SyscallSucceeds());
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TEST_PCHECK(sigaddset(&mask, SIGALRM) == 0);
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SetTimer(timer_duration);
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MaybeSave();
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ASSERT_FALSE(TimerFired());
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ASSERT_THAT(syscallPpoll(nullptr, 0, &timeout, &mask, kSigsetSize),
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SyscallSucceeds());
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EXPECT_TRUE(TimerFired());
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EXPECT_EQ(absl::DurationFromTimespec(timeout), absl::Duration());
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}
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// Verify that signals allowed by the ppoll mask (that would otherwise be
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// blocked) interrupt ppoll.
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TEST_F(PpollTest, SignalMaskAllowsSignal) {
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absl::Duration duration(absl::Seconds(30));
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struct timespec timeout = absl::ToTimespec(duration);
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absl::Duration timer_duration(absl::Seconds(10));
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sigset_t mask;
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ASSERT_THAT(sigprocmask(0, nullptr, &mask), SyscallSucceeds());
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// Block SIGALRM.
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auto cleanup =
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ASSERT_NO_ERRNO_AND_VALUE(ScopedSignalMask(SIG_BLOCK, SIGALRM));
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// Call with a mask that unblocks SIGALRM. See that ppoll is interrupted.
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SetTimer(timer_duration);
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MaybeSave();
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ASSERT_FALSE(TimerFired());
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ASSERT_THAT(syscallPpoll(nullptr, 0, &timeout, &mask, kSigsetSize),
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SyscallFailsWithErrno(EINTR));
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EXPECT_TRUE(TimerFired());
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EXPECT_GT(absl::DurationFromTimespec(timeout), absl::Duration());
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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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