1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * 07/2001 Ported by Wayne Boyer
4 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /*
22 * Test Description:
23 * Verify that, when fchown(2) invoked by super-user to change the owner and
24 * group of a file specified by file descriptor to any numeric
25 * owner(uid)/group(gid) values,
26 * - clears setuid and setgid bits set on an executable file.
27 * - preserves setgid bit set on a non-group-executable file.
28 */
29
30 #include <stdio.h>
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34 #include <errno.h>
35 #include <string.h>
36 #include <signal.h>
37
38 #include "test.h"
39 #include "safe_macros.h"
40 #include "compat_16.h"
41
42 #define FILE_MODE S_IFREG | S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
43 #define NEW_PERMS1 S_IFREG | S_IRWXU | S_IRWXG | S_ISUID | S_ISGID
44 #define NEW_PERMS2 S_IFREG | S_IRWXU | S_ISGID
45 #define EXP_PERMS S_IFREG | S_IRWXU | S_IRWXG
46 #define TESTFILE1 "testfile1"
47 #define TESTFILE2 "testfile2"
48
49 TCID_DEFINE(fchown02);
50 int TST_TOTAL = 2;
51 static int fd1;
52 static int fd2;
53
54 struct test_case {
55 int *fd;
56 char *pathname;
57 char *desc;
58 uid_t user_id;
59 gid_t group_id;
60 int test_flag;
61 } tc[] = {
62 {&fd1, TESTFILE1, "Setuid/Setgid bits cleared", 700, 701, 1},
63 {&fd2, TESTFILE2, "Setgid bit not cleared", 700, 701, 2},
64 {0, NULL, NULL, 0, 0, 0}
65 };
66
67 static void setup(void);
68 static void cleanup(void);
69
verify_fchown(struct test_case * t)70 static void verify_fchown(struct test_case *t)
71 {
72 struct stat stat_buf;
73
74 TEST(FCHOWN(cleanup, *t->fd, t->user_id, t->group_id));
75
76 if (TEST_RETURN == -1) {
77 tst_resm(TFAIL | TTERRNO, "fchown() Fails on %s", t->pathname);
78 return;
79 }
80
81 SAFE_FSTAT(cleanup, *t->fd, &stat_buf);
82
83 if ((stat_buf.st_uid != t->user_id) ||
84 (stat_buf.st_gid != t->group_id)) {
85 tst_resm(TFAIL,
86 "%s: Incorrect ownership expected %d %d, have %d %d",
87 t->pathname, t->user_id, t->group_id,
88 stat_buf.st_uid, stat_buf.st_gid);
89 }
90
91 switch (t->test_flag) {
92 case 1:
93 if (((stat_buf.st_mode & (S_ISUID | S_ISGID)))) {
94 tst_resm(TFAIL, "%s: Incorrect mode "
95 "permissions %#o, Expected "
96 "%#o", t->pathname, NEW_PERMS1,
97 EXP_PERMS);
98 return;
99 }
100 break;
101 case 2:
102 if ((!(stat_buf.st_mode & S_ISGID))) {
103 tst_resm(TFAIL,
104 "%s: Incorrect mode "
105 "permissions %#o, Expected "
106 "%#o", t->pathname,
107 stat_buf.st_mode, NEW_PERMS2);
108 return;
109 }
110 break;
111 }
112
113 tst_resm(TPASS, "fchown() on %s succeeds : %s", t->pathname, t->desc);
114 }
115
main(int ac,char ** av)116 int main(int ac, char **av)
117 {
118 int lc, i;
119
120 tst_parse_opts(ac, av, NULL, NULL);
121
122 setup();
123
124 for (lc = 0; TEST_LOOPING(lc); lc++) {
125 for (i = 0; tc[i].desc != NULL; i++)
126 verify_fchown(tc + i);
127 }
128
129 cleanup();
130 tst_exit();
131 }
132
setup(void)133 static void setup(void)
134 {
135 tst_require_root();
136
137 tst_sig(NOFORK, DEF_HANDLER, cleanup);
138
139 TEST_PAUSE;
140
141 tst_tmpdir();
142
143 fd1 = SAFE_OPEN(cleanup, TESTFILE1, O_RDWR | O_CREAT, FILE_MODE);
144 SAFE_CHMOD(cleanup, TESTFILE1, NEW_PERMS1);
145 fd2 = SAFE_OPEN(cleanup, TESTFILE2, O_RDWR | O_CREAT, FILE_MODE);
146 SAFE_CHMOD(cleanup, TESTFILE2, NEW_PERMS2);
147 }
148
cleanup(void)149 static void cleanup(void)
150 {
151 if (fd1 > 0 && close(fd1))
152 tst_resm(TWARN | TERRNO, "Failed to close fd1");
153
154 if (fd2 > 0 && close(fd2))
155 tst_resm(TWARN | TERRNO, "Failed to close fd2");
156
157 tst_rmdir();
158 }
159