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ea1bd74d | 1 | /* Erasure of sensitive data, generic implementation. |
dff8da6b | 2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
ea1bd74d ZW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
ea1bd74d ZW |
18 | |
19 | /* An assembler implementation of explicit_bzero can be created as an | |
20 | assembler alias of an optimized bzero implementation. | |
21 | Architecture-specific implementations also need to define | |
22 | __explicit_bzero_chk. */ | |
23 | ||
24 | #include <string.h> | |
25 | ||
26 | /* glibc-internal users use __explicit_bzero_chk, and explicit_bzero | |
27 | redirects to that. */ | |
28 | #undef explicit_bzero | |
29 | ||
30 | /* Set LEN bytes of S to 0. The compiler will not delete a call to | |
31 | this function, even if S is dead after the call. */ | |
32 | void | |
33 | explicit_bzero (void *s, size_t len) | |
34 | { | |
35 | memset (s, '\0', len); | |
36 | /* Compiler barrier. */ | |
37 | asm volatile ("" ::: "memory"); | |
38 | } |