1 /*
2 * Force legacy printpath/umovestr using PR_SET_DUMPABLE.
3 *
4 * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31
32 #ifdef HAVE_PRCTL
33 # include <sys/prctl.h>
34 #endif
35
36 #if defined HAVE_PRCTL && defined PR_SET_DUMPABLE
37
38 # include <stdio.h>
39 # include <unistd.h>
40
41 # include "test_ucopy.h"
42
43 int
main(void)44 main(void)
45 {
46 if (!test_process_vm_readv())
47 perror_msg_and_skip("process_vm_readv");
48
49 /*
50 * Clearing dumpable flag disallows process_vm_readv.
51 * If the kernel does not contain commit
52 * 84d77d3f06e7e8dea057d10e8ec77ad71f721be3, then
53 * PTRACE_PEEKDATA remains allowed.
54 */
55 if (prctl(PR_SET_DUMPABLE, 0))
56 perror_msg_and_skip("PR_SET_DUMPABLE 0");
57
58 if (!test_ptrace_peekdata())
59 perror_msg_and_skip("PTRACE_PEEKDATA");
60
61 test_printstrn(DEFAULT_STRLEN);
62
63 puts("+++ exited with 0 +++");
64 return 0;
65 }
66
67 #else
68
69 SKIP_MAIN_UNDEFINED("HAVE_PRCTL && PR_SET_DUMPABLE")
70
71 #endif
72