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 <fcntl.h>
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2021-03-18 19:14:01 +00:00
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#include <sys/mman.h>
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2018-12-10 22:41:40 +00:00
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#include <unistd.h>
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2019-11-21 19:29:49 +00:00
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2018-12-10 22:41:40 +00:00
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#include <vector>
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#include "gtest/gtest.h"
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2021-03-18 19:14:01 +00:00
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#include "absl/base/macros.h"
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#include "test/util/cleanup.h"
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2018-12-10 22:41:40 +00:00
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#include "test/util/file_descriptor.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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class ReadTest : public ::testing::Test {
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void SetUp() override {
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name_ = NewTempAbsPath();
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int fd;
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ASSERT_THAT(fd = open(name_.c_str(), O_CREAT, 0644), SyscallSucceeds());
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ASSERT_THAT(close(fd), SyscallSucceeds());
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}
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void TearDown() override { unlink(name_.c_str()); }
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public:
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std::string name_;
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};
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TEST_F(ReadTest, ZeroBuffer) {
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int fd;
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ASSERT_THAT(fd = open(name_.c_str(), O_RDWR), SyscallSucceeds());
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char msg[] = "hello world";
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EXPECT_THAT(PwriteFd(fd, msg, strlen(msg), 0),
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SyscallSucceedsWithValue(strlen(msg)));
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char buf[10];
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EXPECT_THAT(ReadFd(fd, buf, 0), SyscallSucceedsWithValue(0));
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_F(ReadTest, EmptyFileReturnsZeroAtEOF) {
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int fd;
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ASSERT_THAT(fd = open(name_.c_str(), O_RDWR), SyscallSucceeds());
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char eof_buf[10];
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EXPECT_THAT(ReadFd(fd, eof_buf, 10), SyscallSucceedsWithValue(0));
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_F(ReadTest, EofAfterRead) {
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int fd;
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ASSERT_THAT(fd = open(name_.c_str(), O_RDWR), SyscallSucceeds());
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// Write some bytes to be read.
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constexpr char kMessage[] = "hello world";
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EXPECT_THAT(PwriteFd(fd, kMessage, sizeof(kMessage), 0),
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SyscallSucceedsWithValue(sizeof(kMessage)));
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// Read all of the bytes at once.
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char buf[sizeof(kMessage)];
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EXPECT_THAT(ReadFd(fd, buf, sizeof(kMessage)),
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SyscallSucceedsWithValue(sizeof(kMessage)));
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// Read again with a non-zero buffer and expect EOF.
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char eof_buf[10];
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EXPECT_THAT(ReadFd(fd, eof_buf, 10), SyscallSucceedsWithValue(0));
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_F(ReadTest, DevNullReturnsEof) {
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int fd;
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ASSERT_THAT(fd = open("/dev/null", O_RDONLY), SyscallSucceeds());
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std::vector<char> buf(1);
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EXPECT_THAT(ReadFd(fd, buf.data(), 1), SyscallSucceedsWithValue(0));
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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const int kReadSize = 128 * 1024;
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// Do not allow random save as it could lead to partial reads.
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2021-04-13 22:40:41 +00:00
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TEST_F(ReadTest, CanReadFullyFromDevZero) {
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2018-12-10 22:41:40 +00:00
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int fd;
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ASSERT_THAT(fd = open("/dev/zero", O_RDONLY), SyscallSucceeds());
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std::vector<char> buf(kReadSize, 1);
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EXPECT_THAT(ReadFd(fd, buf.data(), kReadSize),
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SyscallSucceedsWithValue(kReadSize));
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EXPECT_THAT(close(fd), SyscallSucceeds());
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EXPECT_EQ(std::vector<char>(kReadSize, 0), buf);
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}
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TEST_F(ReadTest, ReadDirectoryFails) {
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const FileDescriptor file =
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ASSERT_NO_ERRNO_AND_VALUE(Open(GetAbsoluteTestTmpdir(), O_RDONLY));
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std::vector<char> buf(1);
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EXPECT_THAT(ReadFd(file.get(), buf.data(), 1), SyscallFailsWithErrno(EISDIR));
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}
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2021-01-28 20:22:00 +00:00
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TEST_F(ReadTest, ReadWithOpath) {
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SKIP_IF(IsRunningWithVFS1());
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_PATH));
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std::vector<char> buf(1);
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EXPECT_THAT(ReadFd(fd.get(), buf.data(), 1), SyscallFailsWithErrno(EBADF));
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}
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2021-03-18 19:14:01 +00:00
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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(ReadTest, PartialReadSIGSEGV) {
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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 =
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mmap(0, size, PROT_WRITE | 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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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(name_.c_str(), O_RDWR, 0666));
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for (size_t i = 0; i < 2; i++) {
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EXPECT_THAT(pwrite(fd.get(), addr, size, 0),
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SyscallSucceedsWithValue(size));
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}
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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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// Attempt to read to both pages. Create a non-contiguous iovec pair to
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// 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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2021-05-22 03:17:34 +00:00
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EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallSucceeds());
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EXPECT_THAT(readv(fd.get(), iov, ABSL_ARRAYSIZE(iov)),
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2021-03-18 19:14:01 +00:00
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SyscallSucceedsWithValue(size));
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}
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2018-12-10 22:41:40 +00:00
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} // namespace
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} // namespace testing
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} // namespace gvisor
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