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 * Copyright (c) 2016-2018 The strace developers.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "tests.h"
33 #include <asm/unistd.h>
34 #include <linux/prctl.h>
35
36 #if defined __NR_prctl && defined PR_GET_DUMPABLE && defined PR_SET_DUMPABLE \
37 && !defined __ia64__
38
39 # include <stdio.h>
40 # include <unistd.h>
41
42 static const char *errstr;
43
44 static long
prctl(kernel_ulong_t arg1,kernel_ulong_t arg2)45 prctl(kernel_ulong_t arg1, kernel_ulong_t arg2)
46 {
47 static const kernel_ulong_t bogus_arg =
48 (kernel_ulong_t) 0xdeadbeefbadc0dedULL;
49 long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg);
50 errstr = sprintrc(rc);
51 return rc;
52 }
53
54 int
main(void)55 main(void)
56 {
57 static const kernel_ulong_t bogus_dumpable1 =
58 (kernel_ulong_t) 0xdeadc0de00000001ULL;
59 static const kernel_ulong_t bogus_dumpable2 =
60 (kernel_ulong_t) 0xdeadc0defacebeefULL;
61
62 static const char * const args[] = {
63 "SUID_DUMP_DISABLE",
64 "SUID_DUMP_USER",
65 "SUID_DUMP_ROOT",
66 };
67
68 unsigned int i;
69
70 prctl(PR_SET_DUMPABLE, 3);
71 printf("prctl(PR_SET_DUMPABLE, 0x3 /* SUID_DUMP_??? */) = %s\n",
72 errstr);
73
74 prctl(PR_SET_DUMPABLE, bogus_dumpable1);
75 if (bogus_dumpable1 == 1) {
76 printf("prctl(PR_SET_DUMPABLE, SUID_DUMP_USER) = %s\n", errstr);
77 } else {
78 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */)"
79 " = %s\n",
80 (unsigned long long) bogus_dumpable1, errstr);
81 }
82
83 prctl(PR_SET_DUMPABLE, bogus_dumpable2);
84 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */) = %s\n",
85 (unsigned long long) bogus_dumpable2, errstr);
86
87 for (i = 0; i < ARRAY_SIZE(args); ++i) {
88 prctl(PR_SET_DUMPABLE, i);
89 printf("prctl(PR_SET_DUMPABLE, %s) = %s\n", args[i], errstr);
90
91 long rc = prctl(PR_GET_DUMPABLE, bogus_dumpable2);
92 if (rc >= 0 && rc < (long) ARRAY_SIZE(args)) {
93 printf("prctl(PR_GET_DUMPABLE) = %s (%s)\n",
94 errstr, args[rc]);
95 } else {
96 printf("prctl(PR_GET_DUMPABLE) = %s\n", errstr);
97 }
98 }
99
100 puts("+++ exited with 0 +++");
101 return 0;
102 }
103
104 #else
105
106 SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_DUMPABLE && PR_SET_DUMPABLE"
107 " && !__ia64__")
108
109 #endif
110