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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2023 FUJITSU LIMITED. All rights reserved.
* Copyright (c) Linux Test Project, 2003-2023
* Author: Yang Xu <xuyang2018.jy@fujitsu.com>
*/
/*\
* [Description]
*
* Test basic error handling of faccessat2 syscall:
*
* - faccessat2() fails with EFAULT if pathname is a bad pathname point.
* - faccessat2() fails with EINVAL if flags is -1.
* - faccessat2() fails with EINVAL if mode is -1.
* - faccessat2() fails with EBADF if dirfd is -1.
* - faccessat2() fails with ENOTDIR if pathname is relative path to a
* file and dir_fd is file descriptor for this file.
* - faccessat2() fails with EACCES if flags is AT_EACCESS and not using
* the effective user and group IDs.
*
* Minimum Linux version required is v5.8.
*/
#include <pwd.h>
#include "tst_test.h"
#include "lapi/syscalls.h"
#include "lapi/faccessat.h"
#define TESTUSER "nobody"
#define TESTDIR "faccessat2dir"
#define RELPATH "faccessat2dir/faccessat2file"
static int fd;
static int bad_fd = -1;
static int atcwd_fd = AT_FDCWD;
static char *bad_path;
static char *rel_path;
static struct passwd *ltpuser;
static struct tcase {
int *fd;
char **filename;
int mode;
int flags;
int exp_errno;
const char *desc;
} tcases[] = {
{&atcwd_fd, &bad_path, R_OK, 0, EFAULT, "invalid address"},
{&atcwd_fd, &rel_path, R_OK, -1, EINVAL, "invalid flags"},
{&atcwd_fd, &rel_path, -1, 0, EINVAL, "invalid mode"},
{&bad_fd, &rel_path, R_OK, 0, EBADF, "invalid fd"},
{&fd, &rel_path, R_OK, 0, ENOTDIR, "fd pointing to file"},
{&atcwd_fd, &rel_path, R_OK, AT_EACCESS, EACCES,
"AT_EACCESS and unprivileged EUID"},
};
static void verify_faccessat2(unsigned int i)
{
struct tcase *tc = &tcases[i];
if (tc->exp_errno == EACCES)
SAFE_SETEUID(ltpuser->pw_uid);
TST_EXP_FAIL(faccessat2(*tc->fd, *tc->filename, tc->mode, tc->flags),
tc->exp_errno, "faccessat2() with %s", tc->desc);
if (tc->exp_errno == EACCES)
SAFE_SETEUID(0);
}
static void setup(void)
{
SAFE_MKDIR(TESTDIR, 0666);
SAFE_TOUCH(RELPATH, 0444, NULL);
fd = SAFE_OPEN(RELPATH, O_RDONLY);
bad_path = tst_get_bad_addr(NULL);
ltpuser = SAFE_GETPWNAM(TESTUSER);
}
static void cleanup(void)
{
if (fd > -1)
SAFE_CLOSE(fd);
}
static struct tst_test test = {
.test = verify_faccessat2,
.tcnt = ARRAY_SIZE(tcases),
.setup = setup,
.cleanup = cleanup,
.bufs = (struct tst_buffers []) {
{&rel_path, .str = RELPATH},
{},
},
.needs_tmpdir = 1,
.needs_root = 1,
};
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