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ea1bd74d | 1 | /* Generic implementation of __explicit_bzero_chk. |
dff8da6b | 2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
ea1bd74d | 3 | This file is part of the GNU C Library. |
ea1bd74d ZW |
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 | /* This is the generic definition of __explicit_bzero_chk. The | |
20 | __explicit_bzero_chk symbol is used as the implementation of | |
7f0d9e61 | 21 | explicit_bzero throughout glibc. If this file is overridden by an |
ea1bd74d ZW |
22 | architecture, both __explicit_bzero_chk and |
23 | __explicit_bzero_chk_internal have to be defined (the latter not as | |
24 | an IFUNC). */ | |
25 | ||
26 | #include <string.h> | |
27 | ||
28 | void | |
29 | __explicit_bzero_chk (void *dst, size_t len, size_t dstlen) | |
30 | { | |
31 | /* Inline __memset_chk to avoid a PLT reference to __memset_chk. */ | |
32 | if (__glibc_unlikely (dstlen < len)) | |
33 | __chk_fail (); | |
34 | memset (dst, '\0', len); | |
35 | /* Compiler barrier. */ | |
36 | asm volatile ("" ::: "memory"); | |
37 | } | |
38 | ||
39 | /* libc-internal references use the hidden | |
40 | __explicit_bzero_chk_internal symbol. This is necessary if | |
41 | __explicit_bzero_chk is implemented as an IFUNC because some | |
42 | targets do not support hidden references to IFUNC symbols. */ | |
43 | strong_alias (__explicit_bzero_chk, __explicit_bzero_chk_internal) |