1 /*
2 * Check decoding of prctl PR_GET_DUMPABLE/PR_SET_DUMPABLE operations.
3 *
4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
5 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "tests.h"
32 #include <asm/unistd.h>
33 #include <linux/prctl.h>
34
35 #if defined __NR_prctl && defined PR_GET_DUMPABLE && defined PR_SET_DUMPABLE
36
37 # include <stdio.h>
38 # include <unistd.h>
39
40 static const char *errstr;
41
42 static long
prctl(kernel_ulong_t arg1,kernel_ulong_t arg2)43 prctl(kernel_ulong_t arg1, kernel_ulong_t arg2)
44 {
45 static const kernel_ulong_t bogus_arg =
46 (kernel_ulong_t) 0xdeadbeefbadc0dedULL;
47 long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg);
48 errstr = sprintrc(rc);
49 return rc;
50 }
51
52 int
main(void)53 main(void)
54 {
55 static const kernel_ulong_t bogus_dumpable1 =
56 (kernel_ulong_t) 0xdeadc0de00000001ULL;
57 static const kernel_ulong_t bogus_dumpable2 =
58 (kernel_ulong_t) 0xdeadc0defacebeefULL;
59
60 static const char * const args[] = {
61 "SUID_DUMP_DISABLE",
62 "SUID_DUMP_USER",
63 "SUID_DUMP_ROOT",
64 };
65
66 unsigned int i;
67
68 prctl(PR_SET_DUMPABLE, 3);
69 printf("prctl(PR_SET_DUMPABLE, 0x3 /* SUID_DUMP_??? */) = %s\n",
70 errstr);
71
72 prctl(PR_SET_DUMPABLE, bogus_dumpable1);
73 if (bogus_dumpable1 == 1) {
74 printf("prctl(PR_SET_DUMPABLE, SUID_DUMP_USER) = %s\n", errstr);
75 } else {
76 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */)"
77 " = %s\n",
78 (unsigned long long) bogus_dumpable1, errstr);
79 }
80
81 prctl(PR_SET_DUMPABLE, bogus_dumpable2);
82 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */) = %s\n",
83 (unsigned long long) bogus_dumpable2, errstr);
84
85 for (i = 0; i < ARRAY_SIZE(args); ++i) {
86 prctl(PR_SET_DUMPABLE, i);
87 printf("prctl(PR_SET_DUMPABLE, %s) = %s\n", args[i], errstr);
88
89 long rc = prctl(PR_GET_DUMPABLE, bogus_dumpable2);
90 if (rc >= 0 && rc < (long) ARRAY_SIZE(args)) {
91 printf("prctl(PR_GET_DUMPABLE) = %s (%s)\n",
92 errstr, args[rc]);
93 } else {
94 printf("prctl(PR_GET_DUMPABLE) = %s\n", errstr);
95 }
96 }
97
98 puts("+++ exited with 0 +++");
99 return 0;
100 }
101
102 #else
103
104 SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_DUMPABLE && PR_SET_DUMPABLE")
105
106 #endif
107