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a3bd2846 | 1 | /* Operating system specific code for generic dynamic loader functions. |
04277e02 | 2 | Copyright (C) 2009-2019 Free Software Foundation, Inc. |
a3bd2846 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
a3bd2846 | 18 | |
15a856b1 | 19 | #include <endian.h> |
35f1e827 UD |
20 | #include <stdint.h> |
21 | ||
22 | static inline uintptr_t __attribute__ ((always_inline)) | |
965cb60a | 23 | _dl_setup_stack_chk_guard (void *dl_random) |
35f1e827 | 24 | { |
15a856b1 UD |
25 | union |
26 | { | |
27 | uintptr_t num; | |
28 | unsigned char bytes[sizeof (uintptr_t)]; | |
29 | } ret = { 0 }; | |
30 | ||
965cb60a UD |
31 | if (dl_random == NULL) |
32 | { | |
6c6a98c9 TV |
33 | ret.bytes[sizeof (ret) - 1] = 255; |
34 | ret.bytes[sizeof (ret) - 2] = '\n'; | |
965cb60a UD |
35 | } |
36 | else | |
15a856b1 UD |
37 | { |
38 | memcpy (ret.bytes, dl_random, sizeof (ret)); | |
39 | #if BYTE_ORDER == LITTLE_ENDIAN | |
98bb2f1c | 40 | ret.num &= ~(uintptr_t) 0xff; |
15a856b1 | 41 | #elif BYTE_ORDER == BIG_ENDIAN |
98bb2f1c | 42 | ret.num &= ~((uintptr_t) 0xff << (8 * (sizeof (ret) - 1))); |
15a856b1 UD |
43 | #else |
44 | # error "BYTE_ORDER unknown" | |
45 | #endif | |
46 | } | |
47 | return ret.num; | |
965cb60a UD |
48 | } |
49 | ||
50 | static inline uintptr_t __attribute__ ((always_inline)) | |
51 | _dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard) | |
52 | { | |
53 | uintptr_t ret; | |
54 | if (dl_random == NULL) | |
55 | ret = stack_chk_guard; | |
56 | else | |
a3bd2846 | 57 | memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret)); |
35f1e827 UD |
58 | return ret; |
59 | } |