1 | /*␊ |
2 | * Copyright (c) 2002 Hiroaki Etoh, Federico G. Schwindt, and Miodrag Vallat.␊ |
3 | * All rights reserved.␊ |
4 | *␊ |
5 | * Redistribution and use in source and binary forms, with or without␊ |
6 | * modification, are permitted provided that the following conditions␊ |
7 | * are met:␊ |
8 | * 1. Redistributions of source code must retain the above copyright␊ |
9 | * notice, this list of conditions and the following disclaimer.␊ |
10 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
11 | * notice, this list of conditions and the following disclaimer in the␊ |
12 | * documentation and/or other materials provided with the distribution.␊ |
13 | *␊ |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR␊ |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED␊ |
16 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE␊ |
17 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,␊ |
18 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES␊ |
19 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR␊ |
20 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,␊ |
22 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN␊ |
23 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE␊ |
24 | * POSSIBILITY OF SUCH DAMAGE.␊ |
25 | *␊ |
26 | */␊ |
27 | ␊ |
28 | ␊ |
29 | #include "libsaio.h"␊ |
30 | ␊ |
31 | #define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))␊ |
32 | ␊ |
33 | long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0};␊ |
34 | ␊ |
35 | void __guard_setup(void) __attribute__ ((visibility ("hidden")));␊ |
36 | ␊ |
37 | void __stack_chk_fail(void);␊ |
38 | ␊ |
39 | ␊ |
40 | void␊ |
41 | __guard_setup(void)␊ |
42 | {␊ |
43 | ␉if (__stack_chk_guard[0]!=0) return;␊ |
44 | ␉␊ |
45 | ␉size_t i;␊ |
46 | ␉long guard[__arraycount(__stack_chk_guard)];␉␊ |
47 | ␉␊ |
48 | ␉arc4rand(guard, sizeof(guard), 0);␊ |
49 | ␉for (i = 0; i < __arraycount(guard); i++)␊ |
50 | ␉␉__stack_chk_guard[i] = guard[i];␊ |
51 | ␉␊ |
52 | ␉if (__stack_chk_guard[0]!=0 && *__stack_chk_guard != 0) return;␊ |
53 | ␉␊ |
54 | ␉/* If a random generator can't be used, the protector switches the guard␊ |
55 | to the "terminator canary" */␊ |
56 | ␉((char*)__stack_chk_guard)[0] = 0; ((char*)__stack_chk_guard)[1] = 0;␊ |
57 | ␉((char*)__stack_chk_guard)[2] = '\n'; ((char*)__stack_chk_guard)[3] = 255;␉␊ |
58 | ␊ |
59 | }␊ |
60 | ␊ |
61 | void␊ |
62 | __stack_chk_fail()␊ |
63 | {␊ |
64 | #ifndef BOOT1␊ |
65 | stop("stack overflow");␊ |
66 | #endif␊ |
67 | for(;;);␊ |
68 | }␊ |
69 | |