1 /*
2 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, write the Free Software Foundation, Inc.,
14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
15 *
16 */
17
18 /*
19 * AUTHOR: Madhu T L <madhu.tarikere@wipro.com>
20 *
21 * DESCRIPTION
22 * Verify that,
23 * 1. delete_module(2) returns -1 and sets errno to ENOENT for nonexistent
24 * module entry.
25 * 2. delete_module(2) returns -1 and sets errno to EFAULT, if
26 * module name parameter is outside program's accessible address space.
27 * 3. delete_module(2) returns -1 and sets errno to EPERM, if effective
28 * user id of the caller is not superuser.
29 */
30
31 #include <errno.h>
32 #include <pwd.h>
33 #include <sys/types.h>
34 #include <unistd.h>
35 #include <limits.h>
36 #if HAVE_LINUX_MODULE_H
37 #include <linux/module.h>
38 #else
39 /* As per http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/include/linux/moduleparam.h?a=ppc#L17 ... */
40 #define MODULE_NAME_LEN ( 64 - sizeof(unsigned long) )
41 #endif
42 #include <sys/mman.h>
43 #include "test.h"
44 #include "safe_macros.h"
45 #include "linux_syscall_numbers.h"
46
47 #define NULLMODNAME ""
48 #define BASEMODNAME "dummy"
49 #define LONGMODNAMECHAR 'm' /* Arbitrarily selected */
50
51 char *TCID = "delete_module02";
52
53 static char nobody_uid[] = "nobody";
54 struct passwd *ltpuser;
55 static char longmodname[MODULE_NAME_LEN];
56 static char modname[20];
57
58 static void setup(void);
59 static void cleanup(void);
60 static void setup1(void);
61 static void cleanup1(void);
62
63 static struct test_case_t {
64 char *modname;
65 int experrno;
66 char *desc;
67 void (*setup) (void);
68 void (*cleanup) (void);
69 } tdat[] = {
70 { modname, ENOENT, "nonexistent module", NULL, NULL},
71 { NULLMODNAME, ENOENT, "null terminated module name", NULL, NULL},
72 { (char *)-1, EFAULT, "module name outside program's "
73 "accessible address space", NULL, NULL},
74 { longmodname, ENOENT, "long module name", NULL, NULL},
75 { modname, EPERM, "non-superuser", setup1, cleanup1},
76 };
77
78 int TST_TOTAL = ARRAY_SIZE(tdat);
79
main(int argc,char ** argv)80 int main(int argc, char **argv)
81 {
82 int lc;
83 int i;
84
85 tst_parse_opts(argc, argv, NULL, NULL);
86
87 setup();
88
89 for (lc = 0; TEST_LOOPING(lc); lc++) {
90 tst_count = 0;
91
92 for (i = 0; i < TST_TOTAL; ++i) {
93 if (tdat[i].setup)
94 tdat[i].setup();
95
96 tst_resm(TINFO, "test %s", tdat[i].desc);
97 TEST(ltp_syscall(__NR_delete_module,
98 tdat[i].modname, 0));
99
100 if (TEST_RETURN != -1) {
101 tst_resm(TFAIL, "delete_module() "
102 "succeeded unexpectedly");
103 } else if (TEST_ERRNO == tdat[i].experrno) {
104 tst_resm(TPASS | TTERRNO,
105 "delete_module() failed as expected");
106 } else {
107 tst_resm(TFAIL | TTERRNO, "delete_module() "
108 "failed unexpectedly; expected: "
109 "%d - %s", tdat[i].experrno,
110 strerror(tdat[i].experrno));
111 }
112 if (tdat[i].cleanup)
113 tdat[i].cleanup();
114 }
115 }
116
117 cleanup();
118 tst_exit();
119 }
120
setup1(void)121 static void setup1(void)
122 {
123 SAFE_SETEUID(cleanup, ltpuser->pw_uid);
124 }
125
cleanup1(void)126 static void cleanup1(void)
127 {
128 SAFE_SETEUID(cleanup, 0);
129 }
130
setup(void)131 static void setup(void)
132 {
133 tst_sig(NOFORK, DEF_HANDLER, cleanup);
134
135 tst_require_root();
136
137 ltpuser = SAFE_GETPWNAM(cleanup, nobody_uid);
138
139 TEST_PAUSE;
140
141 /* Initialize longmodname to LONGMODNAMECHAR character */
142 memset(longmodname, LONGMODNAMECHAR, MODULE_NAME_LEN - 1);
143
144 /* Get unique module name for each child process */
145 if (sprintf(modname, "%s_%d", BASEMODNAME, getpid()) <= 0)
146 tst_brkm(TBROK, NULL, "Failed to initialize module name");
147
148 tdat[2].modname = SAFE_MMAP(cleanup, 0, 1, PROT_NONE,
149 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
150 }
151
cleanup(void)152 void cleanup(void)
153 {
154 }
155