218 lines
7.6 KiB
C++
218 lines
7.6 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 <signal.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/vfs.h>
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#include <time.h>
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#include <unistd.h>
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#include <iostream>
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#include <string>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/strings/string_view.h"
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#include "test/syscalls/linux/file_base.h"
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#include "test/util/capability_util.h"
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#include "test/util/cleanup.h"
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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 FixtureTruncateTest : public FileTest {
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void SetUp() override { FileTest::SetUp(); }
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};
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TEST_F(FixtureTruncateTest, Truncate) {
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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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// Check that it starts at size zero.
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struct stat buf;
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 0);
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// Stay at size zero.
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EXPECT_THAT(truncate(test_file_name_.c_str(), 0), SyscallSucceeds());
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 0);
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// Grow to ten bytes.
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EXPECT_THAT(truncate(test_file_name_.c_str(), 10), SyscallSucceeds());
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 10);
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// Can't be truncated to a negative number.
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EXPECT_THAT(truncate(test_file_name_.c_str(), -1),
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SyscallFailsWithErrno(EINVAL));
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// Try growing past the file size limit.
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sigset_t new_mask;
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sigemptyset(&new_mask);
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sigaddset(&new_mask, SIGXFSZ);
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sigprocmask(SIG_BLOCK, &new_mask, nullptr);
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struct timespec timelimit;
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timelimit.tv_sec = 10;
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timelimit.tv_nsec = 0;
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struct rlimit setlim;
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setlim.rlim_cur = 1024;
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setlim.rlim_max = RLIM_INFINITY;
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ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
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EXPECT_THAT(truncate(test_file_name_.c_str(), 1025),
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SyscallFailsWithErrno(EFBIG));
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EXPECT_EQ(sigtimedwait(&new_mask, nullptr, &timelimit), SIGXFSZ);
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ASSERT_THAT(sigprocmask(SIG_UNBLOCK, &new_mask, nullptr), SyscallSucceeds());
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// Shrink back down to zero.
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EXPECT_THAT(truncate(test_file_name_.c_str(), 0), SyscallSucceeds());
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 0);
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}
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TEST_F(FixtureTruncateTest, Ftruncate) {
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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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// Check that it starts at size zero.
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struct stat buf;
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 0);
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// Stay at size zero.
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EXPECT_THAT(ftruncate(test_file_fd_.get(), 0), SyscallSucceeds());
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 0);
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// Grow to ten bytes.
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EXPECT_THAT(ftruncate(test_file_fd_.get(), 10), SyscallSucceeds());
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 10);
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// Can't be truncated to a negative number.
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EXPECT_THAT(ftruncate(test_file_fd_.get(), -1),
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SyscallFailsWithErrno(EINVAL));
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// Try growing past the file size limit.
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sigset_t new_mask;
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sigemptyset(&new_mask);
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sigaddset(&new_mask, SIGXFSZ);
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sigprocmask(SIG_BLOCK, &new_mask, nullptr);
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struct timespec timelimit;
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timelimit.tv_sec = 10;
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timelimit.tv_nsec = 0;
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struct rlimit setlim;
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setlim.rlim_cur = 1024;
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setlim.rlim_max = RLIM_INFINITY;
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ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
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EXPECT_THAT(ftruncate(test_file_fd_.get(), 1025),
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SyscallFailsWithErrno(EFBIG));
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EXPECT_EQ(sigtimedwait(&new_mask, nullptr, &timelimit), SIGXFSZ);
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ASSERT_THAT(sigprocmask(SIG_UNBLOCK, &new_mask, nullptr), SyscallSucceeds());
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// Shrink back down to zero.
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EXPECT_THAT(ftruncate(test_file_fd_.get(), 0), SyscallSucceeds());
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ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
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EXPECT_EQ(buf.st_size, 0);
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}
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// Truncating a file down clears that portion of the file.
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TEST_F(FixtureTruncateTest, FtruncateShrinkGrow) {
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std::vector<char> buf(10, 'a');
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EXPECT_THAT(WriteFd(test_file_fd_.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(buf.size()));
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// Shrink then regrow the file. This should clear the second half of the file.
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EXPECT_THAT(ftruncate(test_file_fd_.get(), 5), SyscallSucceeds());
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EXPECT_THAT(ftruncate(test_file_fd_.get(), 10), SyscallSucceeds());
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EXPECT_THAT(lseek(test_file_fd_.get(), 0, SEEK_SET), SyscallSucceeds());
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std::vector<char> buf2(10);
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EXPECT_THAT(ReadFd(test_file_fd_.get(), buf2.data(), buf2.size()),
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SyscallSucceedsWithValue(buf2.size()));
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std::vector<char> expect = {'a', 'a', 'a', 'a', 'a',
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'\0', '\0', '\0', '\0', '\0'};
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EXPECT_EQ(expect, buf2);
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}
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TEST(TruncateTest, TruncateDir) {
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auto temp_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
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EXPECT_THAT(truncate(temp_dir.path().c_str(), 0),
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SyscallFailsWithErrno(EISDIR));
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}
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TEST(TruncateTest, FtruncateDir) {
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auto temp_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(temp_dir.path(), O_DIRECTORY | O_RDONLY));
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EXPECT_THAT(ftruncate(fd.get(), 0), SyscallFailsWithErrno(EINVAL));
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}
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TEST(TruncateTest, TruncateNonWriteable) {
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// Make sure we don't have CAP_DAC_OVERRIDE, since that allows the user to
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// always override write permissions.
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ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
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auto temp_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), absl::string_view(), 0555 /* mode */));
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EXPECT_THAT(truncate(temp_file.path().c_str(), 0),
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SyscallFailsWithErrno(EACCES));
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}
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TEST(TruncateTest, FtruncateNonWriteable) {
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auto temp_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
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GetAbsoluteTestTmpdir(), absl::string_view(), 0555 /* mode */));
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(temp_file.path(), O_RDONLY));
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EXPECT_THAT(ftruncate(fd.get(), 0), SyscallFailsWithErrno(EINVAL));
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}
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TEST(TruncateTest, TruncateNonExist) {
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EXPECT_THAT(truncate("/foo/bar", 0), SyscallFailsWithErrno(ENOENT));
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}
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TEST(TruncateTest, FtruncateVirtualTmp_NoRandomSave) {
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auto temp_file = NewTempAbsPathInDir("/dev/shm");
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const DisableSave ds; // Incompatible permissions.
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const FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(temp_file, O_RDWR | O_CREAT | O_EXCL, 0));
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EXPECT_THAT(ftruncate(fd.get(), 100), SyscallSucceeds());
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}
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// NOTE: There are additional truncate(2)/ftruncate(2) tests in mknod.cc
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// which are there to avoid running the tests on a number of different
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// filesystems which may not support mknod.
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} // namespace
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} // namespace testing
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} // namespace gvisor
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