// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2018 Linaro Limited. All rights reserved.
* Author: Rafael David Tinoco <rafael.tinoco@linaro.org>
*/
/*
* In the user.* namespace, only regular files and directories can
* have extended attributes. Otherwise fsetxattr(2) will return -1
* and set errno to EPERM.
*
* There are 7 test cases:
* 1. Set attribute to a regular file, fsetxattr(2) should succeed
* 2. Set attribute to a directory, fsetxattr(2) should succeed
* 3. Set attribute to a symlink which points to the regular file,
* fsetxattr(2) should return -1 and set errno to EEXIST
* 4. Set attribute to a FIFO, fsetxattr(2) should return -1 and set
* errno to EPERM
* 5. Set attribute to a char special file, fsetxattr(2) should
* return -1 and set errno to EPERM
* 6. Set attribute to a block special file, fsetxattr(2) should
* return -1 and set errno to EPERM
* 7. Set attribute to a UNIX domain socket, fsetxattr(2) should
* return -1 and set errno to EPERM
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#ifdef HAVE_SYS_XATTR_H
# include <sys/xattr.h>
#endif
#include "tst_test.h"
#ifdef HAVE_SYS_XATTR_H
#define XATTR_TEST_KEY "user.testkey"
#define XATTR_TEST_VALUE "this is a test value"
#define XATTR_TEST_VALUE_SIZE 20
#define MNTPOINT "mntpoint"
#define OFFSET 11
#define FILENAME "fsetxattr02testfile"
#define DIRNAME "fsetxattr02testdir"
#define SYMLINK "fsetxattr02symlink"
#define FIFO MNTPOINT"/fsetxattr02fifo"
#define CHR MNTPOINT"/fsetxattr02chr"
#define BLK MNTPOINT"/fsetxattr02blk"
#define SOCK "fsetxattr02sock"
struct test_case {
char *fname;
int fd;
int fflags;
char *key;
char *value;
size_t size;
int flags;
int exp_err;
int issocket;
int needskeyset;
};
static struct test_case tc[] = {
{ /* case 00, set attr to reg */
.fname = FILENAME,
.fflags = O_RDONLY,
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = 0,
},
{ /* case 01, set attr to dir */
.fname = DIRNAME,
.fflags = O_RDONLY,
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = 0,
},
{ /* case 02, set attr to symlink */
.fname = SYMLINK,
.fflags = O_RDONLY,
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = EEXIST,
.needskeyset = 1,
},
{ /* case 03, set attr to fifo */
.fname = FIFO,
.fflags = (O_RDONLY | O_NONBLOCK),
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = EPERM,
},
{ /* case 04, set attr to character special */
.fname = CHR,
.fflags = O_RDONLY,
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = EPERM,
},
{ /* case 05, set attr to block special */
.fname = BLK,
.fflags = O_RDONLY,
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = EPERM,
},
{ /* case 06, set attr to socket */
.fname = SOCK,
.fflags = O_RDONLY,
.key = XATTR_TEST_KEY,
.value = XATTR_TEST_VALUE,
.size = XATTR_TEST_VALUE_SIZE,
.flags = XATTR_CREATE,
.exp_err = EPERM,
.issocket = 1,
},
};
static void verify_fsetxattr(unsigned int i)
{
const char *fname = strstr(tc[i].fname, "fsetxattr02") + OFFSET;
/* some tests might require existing keys for each iteration */
if (tc[i].needskeyset) {
SAFE_FSETXATTR(tc[i].fd, tc[i].key, tc[i].value, tc[i].size,
XATTR_CREATE);
}
TEST(fsetxattr(tc[i].fd, tc[i].key, tc[i].value, tc[i].size,
tc[i].flags));
if (TST_RET == -1 && TST_ERR == EOPNOTSUPP)
tst_brk(TCONF, "fsetxattr(2) not supported");
/* success */
if (!tc[i].exp_err) {
if (TST_RET) {
tst_res(TFAIL | TTERRNO,
"fsetxattr(2) on %s failed with %li",
fname, TST_RET);
return;
}
/* this is needed for subsequent iterations */
SAFE_FREMOVEXATTR(tc[i].fd, tc[i].key);
tst_res(TPASS, "fsetxattr(2) on %s passed", fname);
return;
}
if (TST_RET == 0) {
tst_res(TFAIL, "fsetxattr(2) on %s passed unexpectedly", fname);
return;
}
/* fail */
if (tc[i].exp_err != TST_ERR) {
tst_res(TFAIL | TTERRNO,
"fsetxattr(2) on %s should have failed with %s",
fname, tst_strerrno(tc[i].exp_err));
return;
}
/* key might have been added AND test might have failed, remove it */
if (tc[i].needskeyset)
SAFE_FREMOVEXATTR(tc[i].fd, tc[i].key);
tst_res(TPASS | TTERRNO, "fsetxattr(2) on %s failed", fname);
}
static void setup(void)
{
size_t i = 0;
struct sockaddr_un sun;
dev_t dev = makedev(1, 3);
SAFE_TOUCH(FILENAME, 0644, NULL);
SAFE_MKDIR(DIRNAME, 0644);
SAFE_SYMLINK(FILENAME, SYMLINK);
/* root: mknod(2) needs it to create something other than a file */
SAFE_MKNOD(FIFO, S_IFIFO | 0777, 0);
SAFE_MKNOD(CHR, S_IFCHR | 0777, dev);
SAFE_MKNOD(BLK, S_IFBLK | 0777, dev);
for (i = 0; i < ARRAY_SIZE(tc); i++) {
if (!tc[i].issocket) {
tc[i].fd = SAFE_OPEN(tc[i].fname, tc[i].fflags, NULL);
continue;
}
/* differently than setxattr calls, when dealing with
* sockets, mknod() isn't enough to test fsetxattr(2).
* we have to get a real unix socket in order for open()
* to get a file desc.
*/
tc[i].fd = SAFE_SOCKET(AF_UNIX, SOCK_STREAM, 0);
memset(&sun, 0, sizeof(struct sockaddr_un));
sun.sun_family = AF_UNIX;
strncpy(sun.sun_path, tc[i].fname, sizeof(sun.sun_path) - 1);
SAFE_BIND(tc[i].fd, (const struct sockaddr *) &sun,
sizeof(struct sockaddr_un));
}
}
static void cleanup(void)
{
size_t i = 0;
for (i = 0; i < ARRAY_SIZE(tc); i++) {
if (tc[i].fd > 0)
SAFE_CLOSE(tc[i].fd);
}
}
static const char *const needed_drivers[] = {
"brd",
NULL,
};
static struct tst_test test = {
.setup = setup,
.test = verify_fsetxattr,
.cleanup = cleanup,
.tcnt = ARRAY_SIZE(tc),
.needs_devfs = 1,
.mntpoint = MNTPOINT,
.needs_root = 1,
.needs_drivers = needed_drivers,
};
#else /* HAVE_SYS_XATTR_H */
TST_TEST_TCONF("<sys/xattr.h> does not exist");
#endif