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| 1 | /* Operating system specific code for generic dynamic loader functions. |
|---|---|
| 2 | Copyright (C) 2009-2022 Free Software Foundation, Inc. |
| 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 |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <endian.h> |
| 20 | #include <stdint.h> |
| 21 | |
| 22 | static inline uintptr_t __attribute__ ((always_inline)) |
| 23 | _dl_setup_stack_chk_guard (void *dl_random) |
| 24 | { |
| 25 | union |
| 26 | { |
| 27 | uintptr_t num; |
| 28 | unsigned char bytes[sizeof (uintptr_t)]; |
| 29 | } ret = { 0 }; |
| 30 | |
| 31 | if (dl_random == NULL) |
| 32 | { |
| 33 | ret.bytes[sizeof (ret) - 1] = 255; |
| 34 | ret.bytes[sizeof (ret) - 2] = '\n'; |
| 35 | } |
| 36 | else |
| 37 | { |
| 38 | memcpy (ret.bytes, dl_random, sizeof (ret)); |
| 39 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 40 | ret.num &= ~(uintptr_t) 0xff; |
| 41 | #elif BYTE_ORDER == BIG_ENDIAN |
| 42 | ret.num &= ~((uintptr_t) 0xff << (8 * (sizeof (ret) - 1))); |
| 43 | #else |
| 44 | # error "BYTE_ORDER unknown" |
| 45 | #endif |
| 46 | } |
| 47 | return ret.num; |
| 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 |
| 57 | memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret)); |
| 58 | return ret; |
| 59 | } |
| 60 |
Warning: This file is not a C or C++ file. It does not have highlighting.