1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2020 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <stdlib.h>
37 #include <malloc.h>
38 #include <string.h>
39 #include <stdio.h>
40 #include <stdint.h>
41 #include <unistd.h>
42 #include <stdbool.h>
43
44 #ifdef TESTS_ENABLE_STACK_PROTECTOR
45 static volatile bool expect_smash;
46
47 void __attribute__((noinline))
48 #ifdef _HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
49 __attribute((__optimize__("-fno-tree-loop-distribute-patterns")))
50 #endif
my_strcpy(char * d,char * s)51 my_strcpy(char *d, char *s)
52 {
53 while ((*d++ = *s++));
54 }
55
smash_array(char * source,char * dest)56 void __attribute__((noinline)) smash_array(char *source, char *dest)
57 {
58 char local[16];
59
60 my_strcpy(local, source);
61 local[0]++;
62 my_strcpy(dest, local);
63 }
64
65 void
__stack_chk_fail(void)66 __stack_chk_fail (void)
67 {
68 if (expect_smash) {
69 #ifdef TINY_STDIO
70 puts("caught expected stack smash");
71 #endif
72 _exit(0);
73 } else {
74 #ifdef TINY_STDIO
75 puts("caught unexpected stack smash");
76 #endif
77 _exit(1);
78 }
79 }
80
main(void)81 int main(void)
82 {
83 char source[64];
84 char dest[64];
85
86 memset(source, 'x', 15);
87 source[15] = '\0';
88 expect_smash = false;
89 smash_array(source, dest);
90 expect_smash = false;
91 printf("short source %s dest %s\n", source, dest);
92
93 memset(source, 'x', 63);
94 source[63] = '\0';
95 expect_smash = true;
96 smash_array(source, dest);
97 expect_smash = false;
98 printf("missed expected stack smash\n");
99 return 1;
100 }
101 #else
main(void)102 int main(void)
103 {
104 printf("stack protector disabled for tests\n");
105 return 0;
106 }
107 #endif
108
