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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 <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/syscalls/linux/temp_umask.h"
#include "test/util/capability_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/fs_util.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST(CreateTest, TmpFile) {
int fd;
EXPECT_THAT(fd = open(JoinPath(GetAbsoluteTestTmpdir(), "a").c_str(),
O_RDWR | O_CREAT, 0666),
SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
}
TEST(CreateTest, ExistingFile) {
int fd;
EXPECT_THAT(
fd = open(JoinPath(GetAbsoluteTestTmpdir(), "ExistingFile").c_str(),
O_RDWR | O_CREAT, 0666),
SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
EXPECT_THAT(
fd = open(JoinPath(GetAbsoluteTestTmpdir(), "ExistingFile").c_str(),
O_RDWR | O_CREAT, 0666),
SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
}
TEST(CreateTest, CreateAtFile) {
int dirfd;
EXPECT_THAT(dirfd = open(GetAbsoluteTestTmpdir().c_str(), O_DIRECTORY, 0666),
SyscallSucceeds());
EXPECT_THAT(openat(dirfd, "CreateAtFile", O_RDWR | O_CREAT, 0666),
SyscallSucceeds());
EXPECT_THAT(close(dirfd), SyscallSucceeds());
}
TEST(CreateTest, HonorsUmask_NoRandomSave) {
const DisableSave ds; // file cannot be re-opened as writable.
TempUmask mask(0222);
int fd;
ASSERT_THAT(
fd = open(JoinPath(GetAbsoluteTestTmpdir(), "UmaskedFile").c_str(),
O_RDWR | O_CREAT, 0666),
SyscallSucceeds());
struct stat statbuf;
ASSERT_THAT(fstat(fd, &statbuf), SyscallSucceeds());
EXPECT_EQ(0444, statbuf.st_mode & 0777);
EXPECT_THAT(close(fd), SyscallSucceeds());
}
TEST(CreateTest, CreateExclusively) {
std::string filename = NewTempAbsPath();
int fd;
ASSERT_THAT(fd = open(filename.c_str(), O_CREAT | O_RDWR, 0644),
SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
EXPECT_THAT(open(filename.c_str(), O_CREAT | O_EXCL | O_RDWR, 0644),
SyscallFailsWithErrno(EEXIST));
}
TEST(CreateTest, CreateFailsOnUnpermittedDir) {
// Make sure we don't have CAP_DAC_OVERRIDE, since that allows the user to
// always override directory permissions.
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
ASSERT_THAT(open("/foo", O_CREAT | O_RDWR, 0644),
SyscallFailsWithErrno(EACCES));
}
TEST(CreateTest, CreateFailsOnDirWithoutWritePerms) {
// Make sure we don't have CAP_DAC_OVERRIDE, since that allows the user to
// always override directory permissions.
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
auto parent = ASSERT_NO_ERRNO_AND_VALUE(
TempPath::CreateDirWith(GetAbsoluteTestTmpdir(), 0555));
auto file = JoinPath(parent.path(), "foo");
ASSERT_THAT(open(file.c_str(), O_CREAT | O_RDWR, 0644),
SyscallFailsWithErrno(EACCES));
}
// A file originally created RW, but opened RO can later be opened RW.
TEST(CreateTest, OpenCreateROThenRW) {
TempPath file(NewTempAbsPath());
// Create a RW file, but only open it RO.
FileDescriptor fd1 = ASSERT_NO_ERRNO_AND_VALUE(
Open(file.path(), O_CREAT | O_EXCL | O_RDONLY, 0644));
// Now get a RW FD.
FileDescriptor fd2 = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR));
// fd1 is not writable, but fd2 is.
char c = 'a';
EXPECT_THAT(WriteFd(fd1.get(), &c, 1), SyscallFailsWithErrno(EBADF));
EXPECT_THAT(WriteFd(fd2.get(), &c, 1), SyscallSucceedsWithValue(1));
}
} // namespace
} // namespace testing
} // namespace gvisor
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