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
42static const char *errstr;
43
44static long
45prctl(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
54int
55main(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
106SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_DUMPABLE && PR_SET_DUMPABLE"
107		    " && !__ia64__")
108
109#endif
110