1 /*
2 * Check decoding of prctl PR_GET_SECUREBITS/PR_SET_SECUREBITS 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_SECUREBITS && defined PR_SET_SECUREBITS
36
37 # include <stdio.h>
38 # include <unistd.h>
39
40 # include "xlat.h"
41 # include "xlat/secbits.h"
42
43 static const char *errstr;
44
45 static long
prctl(kernel_ulong_t arg1,kernel_ulong_t arg2)46 prctl(kernel_ulong_t arg1, kernel_ulong_t arg2)
47 {
48 static const kernel_ulong_t bogus_arg =
49 (kernel_ulong_t) 0xdeadbeefbadc0dedULL;
50 long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg);
51 errstr = sprintrc(rc);
52 return rc;
53 }
54
55 int
main(void)56 main(void)
57 {
58 static const kernel_ulong_t bits1 =
59 (kernel_ulong_t) 0xdeadc0defacebeefULL;
60 static const kernel_ulong_t bits2 =
61 (kernel_ulong_t) 0xbadc0ded00000000ULL;
62 static const kernel_ulong_t bits3 =
63 (kernel_ulong_t) 0xffULL;
64
65 prctl(PR_SET_SECUREBITS, 0);
66 printf("prctl(PR_SET_SECUREBITS, 0) = %s\n", errstr);
67
68 prctl(PR_SET_SECUREBITS, bits1);
69 printf("prctl(PR_SET_SECUREBITS, SECBIT_NOROOT|SECBIT_NOROOT_LOCKED|"
70 "SECBIT_NO_SETUID_FIXUP|SECBIT_NO_SETUID_FIXUP_LOCKED|"
71 "SECBIT_KEEP_CAPS_LOCKED|SECBIT_NO_CAP_AMBIENT_RAISE|"
72 "SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED|%#llx) = %s\n",
73 (unsigned long long) bits1 & ~0xffULL, errstr);
74
75 if (bits2) {
76 prctl(PR_SET_SECUREBITS, bits2);
77 printf("prctl(PR_SET_SECUREBITS, %#llx /* SECBIT_??? */)"
78 " = %s\n", (unsigned long long) bits2, errstr);
79 }
80
81 prctl(PR_SET_SECUREBITS, bits3);
82 printf("prctl(PR_SET_SECUREBITS, SECBIT_NOROOT|SECBIT_NOROOT_LOCKED|"
83 "SECBIT_NO_SETUID_FIXUP|SECBIT_NO_SETUID_FIXUP_LOCKED|"
84 "SECBIT_KEEP_CAPS|SECBIT_KEEP_CAPS_LOCKED|"
85 "SECBIT_NO_CAP_AMBIENT_RAISE|SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED)"
86 " = %s\n", errstr);
87
88 long rc = prctl(PR_GET_SECUREBITS, bits1);
89 printf("prctl(PR_GET_SECUREBITS) = %s", errstr);
90 if (rc > 0) {
91 printf(" (");
92 printflags(secbits, rc, NULL);
93 printf(")");
94 }
95
96 puts("");
97
98 puts("+++ exited with 0 +++");
99 return 0;
100 }
101
102 #else
103
104 SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_SECUREBITS && PR_SET_SECUREBITS")
105
106 #endif
107