341 lines
12 KiB
C++
341 lines
12 KiB
C++
// Copyright 2018 The gVisor Authors.
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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 <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/base/macros.h"
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#include "test/util/cleanup.h"
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#include "test/util/temp_path.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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// TODO(gvisor.dev/issue/2370): This test is currently very rudimentary.
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class WriteTest : public ::testing::Test {
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public:
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ssize_t WriteBytes(int fd, int bytes) {
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std::vector<char> buf(bytes);
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std::fill(buf.begin(), buf.end(), 'a');
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return WriteFd(fd, buf.data(), buf.size());
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}
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};
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TEST_F(WriteTest, WriteNoExceedsRLimit) {
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// Get the current rlimit and restore after test run.
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struct rlimit initial_lim;
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ASSERT_THAT(getrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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auto cleanup = Cleanup([&initial_lim] {
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EXPECT_THAT(setrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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});
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int fd;
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struct rlimit setlim;
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const int target_lim = 1024;
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setlim.rlim_cur = target_lim;
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setlim.rlim_max = RLIM_INFINITY;
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const std::string pathname = NewTempAbsPath();
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ASSERT_THAT(fd = open(pathname.c_str(), O_WRONLY | O_CREAT, S_IRWXU),
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SyscallSucceeds());
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ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
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EXPECT_THAT(WriteBytes(fd, target_lim), SyscallSucceedsWithValue(target_lim));
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std::vector<char> buf(target_lim + 1);
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std::fill(buf.begin(), buf.end(), 'a');
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EXPECT_THAT(pwrite(fd, buf.data(), target_lim, 1), SyscallSucceeds());
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EXPECT_THAT(pwrite64(fd, buf.data(), target_lim, 1), SyscallSucceeds());
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_F(WriteTest, WriteExceedsRLimit) {
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// Get the current rlimit and restore after test run.
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struct rlimit initial_lim;
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ASSERT_THAT(getrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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auto cleanup = Cleanup([&initial_lim] {
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EXPECT_THAT(setrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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});
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int fd;
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sigset_t filesize_mask;
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sigemptyset(&filesize_mask);
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sigaddset(&filesize_mask, SIGXFSZ);
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struct rlimit setlim;
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const int target_lim = 1024;
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setlim.rlim_cur = target_lim;
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setlim.rlim_max = RLIM_INFINITY;
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const std::string pathname = NewTempAbsPath();
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ASSERT_THAT(fd = open(pathname.c_str(), O_WRONLY | O_CREAT, S_IRWXU),
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SyscallSucceeds());
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ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
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ASSERT_THAT(sigprocmask(SIG_BLOCK, &filesize_mask, nullptr),
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SyscallSucceeds());
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std::vector<char> buf(target_lim + 2);
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std::fill(buf.begin(), buf.end(), 'a');
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EXPECT_THAT(write(fd, buf.data(), target_lim + 1),
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SyscallSucceedsWithValue(target_lim));
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EXPECT_THAT(write(fd, buf.data(), 1), SyscallFailsWithErrno(EFBIG));
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siginfo_t info;
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struct timespec timelimit = {0, 0};
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ASSERT_THAT(RetryEINTR(sigtimedwait)(&filesize_mask, &info, &timelimit),
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SyscallSucceedsWithValue(SIGXFSZ));
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EXPECT_EQ(info.si_code, SI_USER);
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EXPECT_EQ(info.si_pid, getpid());
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EXPECT_EQ(info.si_uid, getuid());
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EXPECT_THAT(pwrite(fd, buf.data(), target_lim + 1, 1),
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SyscallSucceedsWithValue(target_lim - 1));
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EXPECT_THAT(pwrite(fd, buf.data(), 1, target_lim),
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SyscallFailsWithErrno(EFBIG));
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ASSERT_THAT(RetryEINTR(sigtimedwait)(&filesize_mask, &info, &timelimit),
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SyscallSucceedsWithValue(SIGXFSZ));
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EXPECT_EQ(info.si_code, SI_USER);
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EXPECT_EQ(info.si_pid, getpid());
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EXPECT_EQ(info.si_uid, getuid());
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EXPECT_THAT(pwrite64(fd, buf.data(), target_lim + 1, 1),
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SyscallSucceedsWithValue(target_lim - 1));
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EXPECT_THAT(pwrite64(fd, buf.data(), 1, target_lim),
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SyscallFailsWithErrno(EFBIG));
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ASSERT_THAT(RetryEINTR(sigtimedwait)(&filesize_mask, &info, &timelimit),
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SyscallSucceedsWithValue(SIGXFSZ));
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EXPECT_EQ(info.si_code, SI_USER);
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EXPECT_EQ(info.si_pid, getpid());
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EXPECT_EQ(info.si_uid, getuid());
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ASSERT_THAT(sigprocmask(SIG_UNBLOCK, &filesize_mask, nullptr),
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SyscallSucceeds());
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_F(WriteTest, WriteIncrementOffset) {
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_WRONLY));
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int fd = f.get();
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EXPECT_THAT(WriteBytes(fd, 0), SyscallSucceedsWithValue(0));
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EXPECT_THAT(lseek(fd, 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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const int bytes_total = 1024;
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EXPECT_THAT(WriteBytes(fd, bytes_total),
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SyscallSucceedsWithValue(bytes_total));
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EXPECT_THAT(lseek(fd, 0, SEEK_CUR), SyscallSucceedsWithValue(bytes_total));
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}
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TEST_F(WriteTest, WriteIncrementOffsetSeek) {
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const std::string data = "hello world\n";
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), data, TempPath::kDefaultFileMode));
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_WRONLY));
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int fd = f.get();
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const int seek_offset = data.size() / 2;
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ASSERT_THAT(lseek(fd, seek_offset, SEEK_SET),
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SyscallSucceedsWithValue(seek_offset));
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const int write_bytes = 512;
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EXPECT_THAT(WriteBytes(fd, write_bytes),
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SyscallSucceedsWithValue(write_bytes));
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EXPECT_THAT(lseek(fd, 0, SEEK_CUR),
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SyscallSucceedsWithValue(seek_offset + write_bytes));
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}
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TEST_F(WriteTest, WriteIncrementOffsetAppend) {
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const std::string data = "hello world\n";
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), data, TempPath::kDefaultFileMode));
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FileDescriptor f = ASSERT_NO_ERRNO_AND_VALUE(
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Open(tmpfile.path().c_str(), O_WRONLY | O_APPEND));
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int fd = f.get();
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EXPECT_THAT(WriteBytes(fd, 1024), SyscallSucceedsWithValue(1024));
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EXPECT_THAT(lseek(fd, 0, SEEK_CUR),
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SyscallSucceedsWithValue(data.size() + 1024));
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}
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TEST_F(WriteTest, WriteIncrementOffsetEOF) {
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const std::string data = "hello world\n";
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const TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), data, TempPath::kDefaultFileMode));
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_WRONLY));
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int fd = f.get();
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EXPECT_THAT(lseek(fd, 0, SEEK_END), SyscallSucceedsWithValue(data.size()));
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EXPECT_THAT(WriteBytes(fd, 1024), SyscallSucceedsWithValue(1024));
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EXPECT_THAT(lseek(fd, 0, SEEK_END),
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SyscallSucceedsWithValue(data.size() + 1024));
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}
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TEST_F(WriteTest, PwriteNoChangeOffset) {
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_WRONLY));
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int fd = f.get();
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const std::string data = "hello world\n";
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EXPECT_THAT(pwrite(fd, data.data(), data.size(), 0),
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SyscallSucceedsWithValue(data.size()));
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EXPECT_THAT(lseek(fd, 0, SEEK_CUR), SyscallSucceedsWithValue(0));
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const int bytes_total = 1024;
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ASSERT_THAT(WriteBytes(fd, bytes_total),
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SyscallSucceedsWithValue(bytes_total));
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ASSERT_THAT(lseek(fd, 0, SEEK_CUR), SyscallSucceedsWithValue(bytes_total));
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EXPECT_THAT(pwrite(fd, data.data(), data.size(), bytes_total),
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SyscallSucceedsWithValue(data.size()));
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EXPECT_THAT(lseek(fd, 0, SEEK_CUR), SyscallSucceedsWithValue(bytes_total));
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}
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TEST_F(WriteTest, WriteWithOpath) {
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SKIP_IF(IsRunningWithVFS1());
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_PATH));
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int fd = f.get();
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EXPECT_THAT(WriteBytes(fd, 1024), SyscallFailsWithErrno(EBADF));
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}
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TEST_F(WriteTest, WritevWithOpath) {
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SKIP_IF(IsRunningWithVFS1());
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_PATH));
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int fd = f.get();
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char buf[16];
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = sizeof(buf);
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EXPECT_THAT(writev(fd, &iov, /*__count=*/1), SyscallFailsWithErrno(EBADF));
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}
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TEST_F(WriteTest, PwriteWithOpath) {
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SKIP_IF(IsRunningWithVFS1());
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TempPath tmpfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor f =
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ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfile.path().c_str(), O_PATH));
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int fd = f.get();
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const std::string data = "hello world\n";
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EXPECT_THAT(pwrite(fd, data.data(), data.size(), 0),
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SyscallFailsWithErrno(EBADF));
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}
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// Test that partial writes that hit SIGSEGV are correctly handled and return
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// partial write.
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TEST_F(WriteTest, PartialWriteSIGSEGV) {
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// Allocate 2 pages and remove permission from the second.
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const size_t size = 2 * kPageSize;
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void* addr = mmap(0, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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ASSERT_NE(addr, MAP_FAILED);
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auto cleanup = Cleanup(
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[addr, size] { EXPECT_THAT(munmap(addr, size), SyscallSucceeds()); });
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void* badAddr = reinterpret_cast<char*>(addr) + kPageSize;
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ASSERT_THAT(mprotect(badAddr, kPageSize, PROT_NONE), SyscallSucceeds());
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TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path().c_str(), O_WRONLY));
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// Attempt to write both pages to the file. Create a non-contiguous iovec pair
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// to ensure operation is done in 2 steps.
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struct iovec iov[] = {
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{
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.iov_base = addr,
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.iov_len = kPageSize,
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},
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{
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.iov_base = addr,
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.iov_len = size,
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},
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};
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// Write should succeed for the first iovec and half of the second (=2 pages).
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EXPECT_THAT(pwritev(fd.get(), iov, ABSL_ARRAYSIZE(iov), 0),
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SyscallSucceedsWithValue(2 * kPageSize));
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}
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// Test that partial writes that hit SIGBUS are correctly handled and return
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// partial write.
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TEST_F(WriteTest, PartialWriteSIGBUS) {
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SKIP_IF(getenv("GVISOR_GOFER_UNCACHED")); // Can't mmap from uncached files.
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TempPath mapfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor fd_map =
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ASSERT_NO_ERRNO_AND_VALUE(Open(mapfile.path().c_str(), O_RDWR));
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// Let the first page be read to force a partial write.
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ASSERT_THAT(ftruncate(fd_map.get(), kPageSize), SyscallSucceeds());
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// Map 2 pages, one of which is not allocated in the backing file. Reading
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// from it will trigger a SIGBUS.
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const size_t size = 2 * kPageSize;
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void* addr =
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mmap(NULL, size, PROT_READ, MAP_FILE | MAP_PRIVATE, fd_map.get(), 0);
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ASSERT_NE(addr, MAP_FAILED);
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auto cleanup = Cleanup(
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[addr, size] { EXPECT_THAT(munmap(addr, size), SyscallSucceeds()); });
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TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path().c_str(), O_WRONLY));
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// Attempt to write both pages to the file. Create a non-contiguous iovec pair
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// to ensure operation is done in 2 steps.
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struct iovec iov[] = {
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{
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.iov_base = addr,
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.iov_len = kPageSize,
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},
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{
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.iov_base = addr,
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.iov_len = size,
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},
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};
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// Write should succeed for the first iovec and half of the second (=2 pages).
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ASSERT_THAT(pwritev(fd.get(), iov, ABSL_ARRAYSIZE(iov), 0),
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SyscallSucceedsWithValue(2 * kPageSize));
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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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