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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 <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/util/capability_util.h"
#include "test/util/fs_util.h"
#include "test/util/temp_path.h"
#include "test/util/temp_umask.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
class MkdirTest : public ::testing::Test {
protected:
// SetUp creates various configurations of files.
void SetUp() override { dirname_ = NewTempAbsPath(); }
// TearDown unlinks created files.
void TearDown() override {
EXPECT_THAT(rmdir(dirname_.c_str()), SyscallSucceeds());
}
std::string dirname_;
};
TEST_F(MkdirTest, CanCreateWritableDir) {
ASSERT_THAT(mkdir(dirname_.c_str(), 0777), SyscallSucceeds());
std::string filename = JoinPath(dirname_, "anything");
int fd;
ASSERT_THAT(fd = open(filename.c_str(), O_RDWR | O_CREAT, 0666),
SyscallSucceeds());
EXPECT_THAT(close(fd), SyscallSucceeds());
ASSERT_THAT(unlink(filename.c_str()), SyscallSucceeds());
}
TEST_F(MkdirTest, HonorsUmask) {
constexpr mode_t kMask = 0111;
TempUmask mask(kMask);
ASSERT_THAT(mkdir(dirname_.c_str(), 0777), SyscallSucceeds());
struct stat statbuf;
ASSERT_THAT(stat(dirname_.c_str(), &statbuf), SyscallSucceeds());
EXPECT_EQ(0777 & ~kMask, statbuf.st_mode & 0777);
}
TEST_F(MkdirTest, HonorsUmask2) {
constexpr mode_t kMask = 0142;
TempUmask mask(kMask);
ASSERT_THAT(mkdir(dirname_.c_str(), 0777), SyscallSucceeds());
struct stat statbuf;
ASSERT_THAT(stat(dirname_.c_str(), &statbuf), SyscallSucceeds());
EXPECT_EQ(0777 & ~kMask, statbuf.st_mode & 0777);
}
TEST_F(MkdirTest, FailsOnDirWithoutWritePerms) {
// Drop capabilities that allow us to override file and directory permissions.
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_READ_SEARCH, false));
ASSERT_THAT(mkdir(dirname_.c_str(), 0555), SyscallSucceeds());
auto dir = JoinPath(dirname_.c_str(), "foo");
EXPECT_THAT(mkdir(dir.c_str(), 0777), SyscallFailsWithErrno(EACCES));
EXPECT_THAT(open(JoinPath(dirname_, "file").c_str(), O_RDWR | O_CREAT, 0666),
SyscallFailsWithErrno(EACCES));
}
TEST_F(MkdirTest, DirAlreadyExists) {
// Drop capabilities that allow us to override file and directory permissions.
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_OVERRIDE, false));
ASSERT_NO_ERRNO(SetCapability(CAP_DAC_READ_SEARCH, false));
ASSERT_THAT(mkdir(dirname_.c_str(), 0777), SyscallSucceeds());
auto dir = JoinPath(dirname_.c_str(), "foo");
EXPECT_THAT(mkdir(dir.c_str(), 0777), SyscallSucceeds());
struct {
int mode;
int err;
} tests[] = {
{.mode = 0000, .err = EACCES}, // No perm
{.mode = 0100, .err = EEXIST}, // Exec only
{.mode = 0200, .err = EACCES}, // Write only
{.mode = 0300, .err = EEXIST}, // Write+exec
{.mode = 0400, .err = EACCES}, // Read only
{.mode = 0500, .err = EEXIST}, // Read+exec
{.mode = 0600, .err = EACCES}, // Read+write
{.mode = 0700, .err = EEXIST}, // All
};
for (const auto& t : tests) {
printf("mode: 0%o\n", t.mode);
EXPECT_THAT(chmod(dirname_.c_str(), t.mode), SyscallSucceeds());
EXPECT_THAT(mkdir(dir.c_str(), 0777), SyscallFailsWithErrno(t.err));
}
// Clean up.
EXPECT_THAT(chmod(dirname_.c_str(), 0777), SyscallSucceeds());
ASSERT_THAT(rmdir(dir.c_str()), SyscallSucceeds());
}
TEST_F(MkdirTest, MkdirAtEmptyPath) {
ASSERT_THAT(mkdir(dirname_.c_str(), 0777), SyscallSucceeds());
auto fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(dirname_, O_RDONLY | O_DIRECTORY, 0666));
EXPECT_THAT(mkdirat(fd.get(), "", 0777), SyscallFailsWithErrno(ENOENT));
}
} // namespace
} // namespace testing
} // namespace gvisor
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