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06febd8c67
Adds the access attribute newly introduced in GCC 10 to the subset of function declarations that are already covered by _FORTIFY_SOURCE and that don't have corresponding GCC built-in equivalents. Reviewed-by: DJ Delorie <dj@redhat.com>
141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/* Copyright (C) 2004-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _BITS_STRING_FORTIFIED_H
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#define _BITS_STRING_FORTIFIED_H 1
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#ifndef _STRING_H
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# error "Never use <bits/string_fortified.h> directly; include <string.h> instead."
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#endif
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#if !__GNUC_PREREQ (5,0)
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__warndecl (__warn_memset_zero_len,
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"memset used with constant zero length parameter; this could be due to transposed parameters");
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#endif
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__fortify_function void *
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__NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
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size_t __len))
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{
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return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
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}
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__fortify_function void *
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__NTH (memmove (void *__dest, const void *__src, size_t __len))
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{
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return __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
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}
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#ifdef __USE_GNU
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__fortify_function void *
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__NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
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size_t __len))
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{
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return __builtin___mempcpy_chk (__dest, __src, __len, __bos0 (__dest));
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}
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#endif
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/* The first two tests here help to catch a somewhat common problem
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where the second and third parameter are transposed. This is
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especially problematic if the intended fill value is zero. In this
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case no work is done at all. We detect these problems by referring
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non-existing functions. */
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__fortify_function void *
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__NTH (memset (void *__dest, int __ch, size_t __len))
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{
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/* GCC-5.0 and newer implements these checks in the compiler, so we don't
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need them here. */
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#if !__GNUC_PREREQ (5,0)
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if (__builtin_constant_p (__len) && __len == 0
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&& (!__builtin_constant_p (__ch) || __ch != 0))
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{
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__warn_memset_zero_len ();
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return __dest;
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}
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#endif
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return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
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}
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#ifdef __USE_MISC
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# include <bits/strings_fortified.h>
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void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
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__THROW __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
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__fortify_function void
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__NTH (explicit_bzero (void *__dest, size_t __len))
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{
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__explicit_bzero_chk (__dest, __len, __bos0 (__dest));
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}
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#endif
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__fortify_function char *
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__NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
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{
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return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
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}
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#ifdef __USE_GNU
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__fortify_function char *
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__NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
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{
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return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
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}
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#endif
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__fortify_function char *
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__NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
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size_t __len))
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{
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return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
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}
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/* XXX We have no corresponding builtin yet. */
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extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
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size_t __destlen) __THROW
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__attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
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extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
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size_t __n), stpncpy);
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__fortify_function char *
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__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
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{
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if (__bos (__dest) != (size_t) -1
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&& (!__builtin_constant_p (__n) || __n > __bos (__dest)))
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return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
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return __stpncpy_alias (__dest, __src, __n);
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}
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__fortify_function char *
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__NTH (strcat (char *__restrict __dest, const char *__restrict __src))
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{
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return __builtin___strcat_chk (__dest, __src, __bos (__dest));
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}
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__fortify_function char *
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__NTH (strncat (char *__restrict __dest, const char *__restrict __src,
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size_t __len))
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{
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return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
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}
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#endif /* bits/string_fortified.h */
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