fchownat02.c revision d1e794d62b1bf619df8390535e4c2a58899b1145 
1/*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program.
15 */
16/*
17 * Test Description:
18 *   Verify that,
19 *   The flag of fchownat() is AT_SYMLINK_NOFOLLOW and the pathname would
20 *   not be dereferenced if the pathname is a symbolic link.
21 */
22
23#define _GNU_SOURCE
24
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <fcntl.h>
28#include <unistd.h>
29#include <error.h>
30#include <stdlib.h>
31#include <errno.h>
32#include <string.h>
33#include <signal.h>
34#include "test.h"
35#include "safe_macros.h"
36#include "fchownat.h"
37#include "lapi/fcntl.h"
38
39#define TESTFILE	"testfile"
40#define TESTFILE_LINK	"testfile_link"
41
42char *TCID = "fchownat02";
43int TST_TOTAL = 1;
44
45static int dir_fd;
46static uid_t set_uid = 1000;
47static gid_t set_gid = 1000;
48static void setup(void);
49static void cleanup(void);
50static void test_verify(void);
51static void fchownat_verify(void);
52
53int main(int ac, char **av)
54{
55	int lc;
56	int i;
57
58	tst_parse_opts(ac, av, NULL, NULL);
59
60	setup();
61
62	for (lc = 0; TEST_LOOPING(lc); lc++) {
63		tst_count = 0;
64		for (i = 0; i < TST_TOTAL; i++)
65			fchownat_verify();
66	}
67
68	cleanup();
69	tst_exit();
70}
71
72static void setup(void)
73{
74	struct stat c_buf, l_buf;
75
76	if ((tst_kvercmp(2, 6, 16)) < 0)
77		tst_brkm(TCONF, NULL, "This test needs kernel 2.6.16 or newer");
78
79	tst_require_root();
80
81	tst_sig(NOFORK, DEF_HANDLER, cleanup);
82
83	TEST_PAUSE;
84
85	tst_tmpdir();
86
87	dir_fd = SAFE_OPEN(cleanup, "./", O_DIRECTORY);
88
89	SAFE_TOUCH(cleanup, TESTFILE, 0600, NULL);
90
91	SAFE_SYMLINK(cleanup, TESTFILE, TESTFILE_LINK);
92
93	SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
94
95	SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
96
97	if (l_buf.st_uid == set_uid || l_buf.st_gid == set_gid) {
98		tst_brkm(TBROK | TERRNO, cleanup,
99			 "link_uid(%d) == set_uid(%d) or link_gid(%d) == "
100			 "set_gid(%d)", l_buf.st_uid, set_uid, l_buf.st_gid,
101			 set_gid);
102	}
103}
104
105static void fchownat_verify(void)
106{
107	TEST(fchownat(dir_fd, TESTFILE_LINK, set_uid, set_gid,
108		      AT_SYMLINK_NOFOLLOW));
109
110	if (TEST_RETURN != 0) {
111		tst_resm(TFAIL | TTERRNO, "fchownat() failed, errno=%d : %s",
112			 TEST_ERRNO, strerror(TEST_ERRNO));
113	} else {
114		test_verify();
115	}
116}
117
118static void test_verify(void)
119{
120	struct stat c_buf, l_buf;
121
122	SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
123
124	SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
125
126	if (c_buf.st_uid != set_uid && l_buf.st_uid == set_uid &&
127	    c_buf.st_gid != set_gid && l_buf.st_gid == set_gid) {
128		tst_resm(TPASS, "fchownat() test AT_SYMLINK_NOFOLLOW success");
129	} else {
130		tst_resm(TFAIL,
131			 "fchownat() test AT_SYMLINK_NOFOLLOW fail with uid=%d "
132			 "link_uid=%d set_uid=%d | gid=%d link_gid=%d "
133			 "set_gid=%d", c_buf.st_uid, l_buf.st_uid, set_uid,
134			 c_buf.st_gid, l_buf.st_gid, set_gid);
135	}
136}
137
138static void cleanup(void)
139{
140	tst_rmdir();
141}
142