1 /*
2 * Check decoding of prctl operations which use arg2 as pointer to an integer
3 * value: PR_GET_CHILD_SUBREAPER, PR_GET_ENDIAN, PR_GET_FPEMU, and PR_GET_FPEXC.
4 *
5 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
6 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
7 * Copyright (c) 2016-2017 The strace developers.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include "tests.h"
34 #include <asm/unistd.h>
35
36 #if defined __NR_prctl
37
38 # include <stdint.h>
39 # include <stdio.h>
40 # include <unistd.h>
41 # include <linux/prctl.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 bogus_addr1 =
59 (kernel_ulong_t) 0x1e55c0de00000000ULL;
60 static const kernel_ulong_t bogus_addr2 =
61 (kernel_ulong_t) 0xfffffffffffffffdULL;
62 static const kernel_ulong_t bogus_op_bits =
63 (kernel_ulong_t) 0xbadc0ded00000000ULL;
64 static const struct {
65 kernel_ulong_t val;
66 const char *str;
67 } options[] = {
68 { 37, "PR_GET_CHILD_SUBREAPER" },
69 { 19, "PR_GET_ENDIAN" },
70 { 9, "PR_GET_FPEMU" },
71 { 11, "PR_GET_FPEXC" },
72 };
73
74 TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, ptr);
75 long rc;
76 unsigned int i;
77
78 for (i = 0; i < ARRAY_SIZE(options); ++i) {
79 prctl(options[i].val | bogus_op_bits, 0);
80 printf("prctl(%s, NULL) = %s\n", options[i].str, errstr);
81
82 if (bogus_addr1) {
83 prctl(options[i].val | bogus_op_bits, bogus_addr1);
84 printf("prctl(%s, %#llx) = %s\n", options[i].str,
85 (unsigned long long) bogus_addr1, errstr);
86 }
87
88 prctl(options[i].val | bogus_op_bits, bogus_addr2);
89 printf("prctl(%s, %#llx) = %s\n", options[i].str,
90 (unsigned long long) bogus_addr2, errstr);
91
92 prctl(options[i].val | bogus_op_bits, (uintptr_t) (ptr + 1));
93 printf("prctl(%s, %p) = %s\n", options[i].str,
94 ptr + 1, errstr);
95
96 rc = prctl(options[i].val | bogus_op_bits, (uintptr_t) ptr);
97 if (!rc) {
98 printf("prctl(%s, [%u]) = %s\n",
99 options[i].str, *ptr, errstr);
100 } else {
101 printf("prctl(%s, %p) = %s\n",
102 options[i].str, ptr, errstr);
103 }
104
105 if (F8ILL_KULONG_SUPPORTED) {
106 kernel_ulong_t bogus_addr3 = f8ill_ptr_to_kulong(ptr);
107 prctl(options[i].val | bogus_op_bits, bogus_addr3);
108 printf("prctl(%s, %#llx) = %s\n", options[i].str,
109 (unsigned long long) bogus_addr3, errstr);
110 }
111 }
112
113 puts("+++ exited with 0 +++");
114 return 0;
115 }
116
117 #else
118
119 SKIP_MAIN_UNDEFINED("__NR_prctl")
120
121 #endif
122