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debug/explicit_bzero_chk.c
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Generic implementation of __explicit_bzero_chk. Copyright (C) 1991-2026 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* This is the generic definition of __explicit_bzero_chk. The __explicit_bzero_chk symbol is used as the implementation of explicit_bzero throughout glibc. If this file is overridden by an architecture, both __explicit_bzero_chk and __explicit_bzero_chk_internal have to be defined (the latter not as an IFUNC). */ #include <string.h> void __explicit_bzero_chk (void *dst, size_t len, size_t dstlen) { /* Inline __memset_chk to avoid a PLT reference to __memset_chk. */ if (__glibc_unlikely (dstlen < len)) __chk_fail (); memset (dst, '\0', len); /* Compiler barrier. */ asm volatile ("" ::: "memory"); } /* libc-internal references use the hidden __explicit_bzero_chk_internal symbol. This is necessary if __explicit_bzero_chk is implemented as an IFUNC because some targets do not support hidden references to IFUNC symbols. */ strong_alias (__explicit_bzero_chk, __explicit_bzero_chk_internal)