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
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
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