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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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 <gtest/gtest.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/utsname.h>
#include <sys/vfs.h>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
// Glibc v2.19 doesn't include these in fcntl.h so host builds will fail without.
#if !defined(FALLOC_FL_PUNCH_HOLE) || !defined(FALLOC_FL_KEEP_SIZE)
#include <linux/falloc.h>
#include <linux/magic.h>
#endif
TEST(fcntl, fcntl_smoke) {
int fd = open("/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
int flags = fcntl(fd, F_GETFD);
ASSERT_TRUE(flags != -1);
ASSERT_EQ(0, flags & FD_CLOEXEC);
int rc = fcntl(fd, F_SETFD, FD_CLOEXEC);
ASSERT_EQ(0, rc);
flags = fcntl(fd, F_GETFD);
ASSERT_TRUE(flags != -1);
ASSERT_EQ(FD_CLOEXEC, flags & FD_CLOEXEC);
close(fd);
}
TEST(fcntl, open_open64) {
int fd;
fd = open("/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
close(fd);
fd = open64("/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
close(fd);
}
TEST(fcntl, openat_openat64) {
int fd;
fd = openat(AT_FDCWD, "/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
close(fd);
fd = openat64(AT_FDCWD, "/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
close(fd);
}
TEST(fcntl, creat_creat64) {
ASSERT_EQ(-1, creat("", 0666));
ASSERT_EQ(ENOENT, errno);
ASSERT_EQ(-1, creat64("", 0666));
ASSERT_EQ(ENOENT, errno);
}
TEST(fcntl, posix_fadvise) {
TemporaryFile tf;
errno = 0;
EXPECT_EQ(EBADF, posix_fadvise(-1, 0, 0, POSIX_FADV_NORMAL));
EXPECT_EQ(0, errno);
EXPECT_EQ(EBADF, posix_fadvise64(-1, 0, 0, POSIX_FADV_NORMAL));
EXPECT_EQ(0, errno);
EXPECT_EQ(EINVAL, posix_fadvise(tf.fd, 0, 0, -1));
EXPECT_EQ(0, errno);
EXPECT_EQ(EINVAL, posix_fadvise64(tf.fd, 0, 0, -1));
EXPECT_EQ(0, errno);
EXPECT_EQ(0, posix_fadvise(tf.fd, 0, 0, POSIX_FADV_NORMAL));
EXPECT_EQ(0, posix_fadvise64(tf.fd, 0, 0, POSIX_FADV_NORMAL));
}
TEST(fcntl, fallocate_EINVAL) {
TemporaryFile tf;
// fallocate/fallocate64 set errno.
// posix_fallocate/posix_fallocate64 return an errno value.
errno = 0;
ASSERT_EQ(-1, fallocate(tf.fd, 0, 0, -1));
ASSERT_EQ(EINVAL, errno);
errno = 0;
ASSERT_EQ(-1, fallocate64(tf.fd, 0, 0, -1));
ASSERT_EQ(EINVAL, errno);
errno = 0;
ASSERT_EQ(EINVAL, posix_fallocate(tf.fd, 0, -1));
ASSERT_EQ(0, errno);
errno = 0;
ASSERT_EQ(EINVAL, posix_fallocate64(tf.fd, 0, -1));
ASSERT_EQ(0, errno);
}
TEST(fcntl, fallocate) {
TemporaryFile tf;
struct stat sb;
ASSERT_EQ(0, fstat(tf.fd, &sb));
ASSERT_EQ(0, sb.st_size);
#if defined(__BIONIC__)
ASSERT_EQ(0, fallocate(tf.fd, 0, 0, 1));
ASSERT_EQ(0, fstat(tf.fd, &sb));
ASSERT_EQ(1, sb.st_size);
ASSERT_EQ(0, fallocate64(tf.fd, 0, 0, 2));
ASSERT_EQ(0, fstat(tf.fd, &sb));
ASSERT_EQ(2, sb.st_size);
#endif
ASSERT_EQ(0, posix_fallocate(tf.fd, 0, 3));
ASSERT_EQ(0, fstat(tf.fd, &sb));
ASSERT_EQ(3, sb.st_size);
ASSERT_EQ(0, posix_fallocate64(tf.fd, 0, 4));
ASSERT_EQ(0, fstat(tf.fd, &sb));
ASSERT_EQ(4, sb.st_size);
}
TEST(fcntl, f_getlk64) {
int fd = open64("/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
struct flock64 check_lock;
check_lock.l_type = F_WRLCK;
check_lock.l_start = 0;
check_lock.l_whence = SEEK_SET;
check_lock.l_len = 0;
int rc = fcntl(fd, F_GETLK64, &check_lock);
ASSERT_EQ(0, rc);
close(fd);
}
TEST(fcntl, splice) {
int pipe_fds[2];
ASSERT_EQ(0, pipe(pipe_fds));
int in = open("/proc/cpuinfo", O_RDONLY);
ASSERT_NE(in, -1);
TemporaryFile tf;
ssize_t bytes_read = splice(in, nullptr, pipe_fds[1], nullptr, 8*1024, SPLICE_F_MORE | SPLICE_F_MOVE);
ASSERT_NE(bytes_read, -1);
ssize_t bytes_written = splice(pipe_fds[0], nullptr, tf.fd, nullptr, bytes_read, SPLICE_F_MORE | SPLICE_F_MOVE);
ASSERT_EQ(bytes_read, bytes_written);
close(pipe_fds[0]);
close(pipe_fds[1]);
close(in);
}
TEST(fcntl, vmsplice) {
int pipe_fds[2];
ASSERT_EQ(0, pipe(pipe_fds));
iovec v[2];
v[0].iov_base = const_cast<char*>("hello ");
v[0].iov_len = 6;
v[1].iov_base = const_cast<char*>("world\n");
v[1].iov_len = 6;
ssize_t bytes_written = vmsplice(pipe_fds[1], v, sizeof(v)/sizeof(iovec), 0);
ASSERT_EQ(v[0].iov_len + v[1].iov_len, static_cast<size_t>(bytes_written));
close(pipe_fds[1]);
char buf[BUFSIZ];
FILE* fp = fdopen(pipe_fds[0], "r");
ASSERT_TRUE(fp != nullptr);
ASSERT_TRUE(fgets(buf, sizeof(buf), fp) != nullptr);
fclose(fp);
ASSERT_STREQ("hello world\n", buf);
}
TEST(fcntl, tee) {
char expected[BUFSIZ];
FILE* expected_fp = fopen("/proc/version", "r");
ASSERT_TRUE(expected_fp != nullptr);
ASSERT_TRUE(fgets(expected, sizeof(expected), expected_fp) != nullptr);
fclose(expected_fp);
int pipe1[2];
ASSERT_EQ(0, pipe(pipe1));
int pipe2[2];
ASSERT_EQ(0, pipe(pipe2));
int in = open("/proc/version", O_RDONLY);
ASSERT_NE(in, -1);
// Write /proc/version into pipe1.
ssize_t bytes_read = splice(in, nullptr, pipe1[1], nullptr, 8*1024, SPLICE_F_MORE | SPLICE_F_MOVE);
ASSERT_NE(bytes_read, -1);
close(pipe1[1]);
// Tee /proc/version from pipe1 into pipe2.
ssize_t bytes_teed = tee(pipe1[0], pipe2[1], SIZE_MAX, 0);
ASSERT_EQ(bytes_read, bytes_teed);
close(pipe2[1]);
// The out fds of both pipe1 and pipe2 should now contain /proc/version.
char buf1[BUFSIZ];
FILE* fp1 = fdopen(pipe1[0], "r");
ASSERT_TRUE(fp1 != nullptr);
ASSERT_TRUE(fgets(buf1, sizeof(buf1), fp1) != nullptr);
fclose(fp1);
char buf2[BUFSIZ];
FILE* fp2 = fdopen(pipe2[0], "r");
ASSERT_TRUE(fp2 != nullptr);
ASSERT_TRUE(fgets(buf2, sizeof(buf2), fp2) != nullptr);
fclose(fp2);
ASSERT_STREQ(expected, buf1);
ASSERT_STREQ(expected, buf2);
}
TEST(fcntl, readahead) {
// Just check that the function is available.
errno = 0;
ASSERT_EQ(-1, readahead(-1, 0, 123));
ASSERT_EQ(EBADF, errno);
}
TEST(fcntl, sync_file_range) {
// Just check that the function is available.
errno = 0;
ASSERT_EQ(-1, sync_file_range(-1, 0, 0, 0));
ASSERT_EQ(EBADF, errno);
TemporaryFile tf;
ASSERT_EQ(0, sync_file_range(tf.fd, 0, 0, 0));
// The arguments to the underlying system call are in a different order on 32-bit ARM.
// Check that the `flags` argument gets passed to the kernel correctly.
errno = 0;
ASSERT_EQ(-1, sync_file_range(tf.fd, 0, 0, ~0));
ASSERT_EQ(EINVAL, errno);
}
static bool parse_kernel_release(long* const major, long* const minor) {
struct utsname buf;
if (uname(&buf) == -1) {
return false;
}
return sscanf(buf.release, "%ld.%ld", major, minor) == 2;
}
/*
* b/28760453:
* Kernels older than 4.1 should have ext4 FALLOC_FL_PUNCH_HOLE disabled due to CVE-2015-8839.
* Devices that fail this test should cherry-pick the following commit:
* https://android.googlesource.com/kernel/msm/+/bdba352e898cbf57c8620ad68c8abf749c784d1f
*/
TEST(fcntl, falloc_punch) {
long major = 0, minor = 0;
ASSERT_TRUE(parse_kernel_release(&major, &minor));
if (major < 4 || (major == 4 && minor < 1)) {
TemporaryFile tf;
struct statfs sfs;
ASSERT_EQ(0, fstatfs(tf.fd, &sfs));
if (sfs.f_type == EXT4_SUPER_MAGIC) {
ASSERT_EQ(-1, fallocate(tf.fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 1));
ASSERT_EQ(errno, EOPNOTSUPP);
}
}
}
TEST(fcntl, open_O_TMPFILE_mode) {
#if __BIONIC__ // Our glibc is too old for O_TMPFILE.
TemporaryDir dir;
// Without O_EXCL, we're allowed to give this a name later.
// (This is unrelated to the O_CREAT interaction with O_EXCL.)
const mode_t perms = S_IRUSR | S_IWUSR;
int fd = open(dir.path, O_TMPFILE | O_RDWR, perms);
// Ignore kernels without O_TMPFILE support (< 3.11).
if (fd == -1 && (errno == EISDIR || errno == EINVAL || errno == EOPNOTSUPP)) return;
ASSERT_TRUE(fd != -1) << strerror(errno);
// Does the fd claim to have the mode we set?
struct stat sb = {};
ASSERT_EQ(0, fstat(fd, &sb));
ASSERT_EQ(perms, (sb.st_mode & ~S_IFMT));
// On Android if we're not root, we won't be able to create links anyway...
if (getuid() != 0) return;
std::string final_path = android::base::StringPrintf("%s/named_now", dir.path);
ASSERT_EQ(0, linkat(AT_FDCWD, android::base::StringPrintf("/proc/self/fd/%d", fd).c_str(),
AT_FDCWD, final_path.c_str(),
AT_SYMLINK_FOLLOW));
ASSERT_EQ(0, close(fd));
// Does the resulting file claim to have the mode we set?
ASSERT_EQ(0, stat(final_path.c_str(), &sb));
ASSERT_EQ(perms, (sb.st_mode & ~S_IFMT));
// With O_EXCL, you're not allowed to add a name later.
fd = open(dir.path, O_TMPFILE | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
ASSERT_TRUE(fd != -1) << strerror(errno);
errno = 0;
ASSERT_EQ(-1, linkat(AT_FDCWD, android::base::StringPrintf("/proc/self/fd/%d", fd).c_str(),
AT_FDCWD, android::base::StringPrintf("%s/no_chance", dir.path).c_str(),
AT_SYMLINK_FOLLOW));
ASSERT_EQ(ENOENT, errno);
ASSERT_EQ(0, close(fd));
#endif
}