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/*
* Copyright (C) 2015-2016 Dimitris Papastamos <sin@2f30.org>
* Copyright (C) 2022 q66 <q66@chimera-linux.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _FORTIFY_STRING_H
#define _FORTIFY_STRING_H
#if !defined(__cplusplus) && !defined(__clang__)
__extension__
#endif
#include_next <string.h>
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
#include "fortify-headers.h"
#ifdef __cplusplus
extern "C" {
#endif
#undef memcpy
#undef memchr
#undef memmove
#undef memset
#undef strcat
#undef strcpy
#undef strncat
#undef strncpy
__access(write_only, 1, 3)
__access(read_only, 2, 3)
_FORTIFY_FN(memcpy) void *memcpy(void * _FORTIFY_POS0 __od,
const void * _FORTIFY_POS0 __os, size_t __n)
{
size_t __bd = __bos(__od, 0);
size_t __bs = __bos(__os, 0);
char *__d = (char *)__od;
const char *__s = (const char *)__os;
/* trap if pointers are overlapping but not if dst == src.
* gcc seems to like to generate code that relies on dst == src */
if ((__d < __s && __d + __n > __s) ||
(__s < __d && __s + __n > __d))
__builtin_trap();
if (__n > __bd || __n > __bs)
__builtin_trap();
return __builtin_memcpy(__od, __os, __n);
}
__access(write_only, 1, 3)
__access(read_only, 2, 3)
_FORTIFY_FN(memmove) void *memmove(void * _FORTIFY_POS0 __d,
const void * _FORTIFY_POS0 __s, size_t __n)
{
size_t __bd = __bos(__d, 0);
size_t __bs = __bos(__s, 0);
if (__n > __bd || __n > __bs)
__builtin_trap();
return __orig_memmove(__d, __s, __n);
}
__access(write_only, 1, 3)
_FORTIFY_FN(memset) void *memset(void * _FORTIFY_POS0 __d, int __c, size_t __n)
{
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __builtin_memset(__d, __c, __n);
}
__access(read_only, 1, 3)
_FORTIFY_FN(memchr) void *memchr(const void * _FORTIFY_POS0 __d, int __c, size_t __n)
{
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __builtin_memchr(__d, __c, __n);
}
#if defined(_GNU_SOURCE)
#undef memrchr
__access(read_only, 1, 3)
_FORTIFY_FN(memrchr) void *memrchr(const void * _FORTIFY_POS0 __d, int __c, size_t __n)
{
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __builtin_memrchr(__d, __c, __n);
}
#endif
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
#undef stpcpy
__access(write_only, 1)
__access(read_only, 2)
_FORTIFY_FN(stpcpy) char *stpcpy(char * _FORTIFY_POS0 __d, const char *__s)
{
size_t __n = strlen(__s) + 1;
/* trap if pointers are overlapping but not if dst == src.
* gcc seems to like to generate code that relies on dst == src */
if ((__d < __s && __d + __n > __s) ||
(__s < __d && __s + __n > __d))
__builtin_trap();
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __orig_stpcpy(__d, __s);
}
#undef stpncpy
__access(write_only, 1)
__access(read_only, 2, 3)
_FORTIFY_FN(stpncpy) char *stpncpy(char * _FORTIFY_POS0 __d, const char *__s,
size_t __n)
{
/* trap if pointers are overlapping but not if dst == src.
* gcc seems to like to generate code that relies on dst == src */
if ((__d < __s && __d + __n > __s) ||
(__s < __d && __s + __n > __d))
__builtin_trap();
size_t __b = __bos(__d, 0);
if (__n > __b && strlen(__s) + 1 > __b)
__builtin_trap();
return __orig_stpncpy(__d, __s, __n);
}
#endif
__access (read_write, 1)
__access (read_only, 2)
_FORTIFY_FN(strcat) char *strcat(char * _FORTIFY_POS0 __d, const char *__s)
{
size_t __b = __bos(__d, 0);
if (strlen(__s) + strlen(__d) + 1 > __b)
__builtin_trap();
return __orig_strcat(__d, __s);
}
__access (write_only, 1)
__access (read_only, 2)
_FORTIFY_FN(strcpy) char *strcpy(char * _FORTIFY_POS0 __d, const char *__s)
{
size_t __n = strlen(__s) + 1;
/* trap if pointers are overlapping but not if dst == src.
* gcc seems to like to generate code that relies on dst == src */
if ((__d < __s && __d + __n > __s) ||
(__s < __d && __s + __n > __d))
__builtin_trap();
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __orig_strcpy(__d, __s);
}
__access (read_write, 1)
__access (read_only, 2, 3)
_FORTIFY_FN(strncat) char *strncat(char * _FORTIFY_POS0 __d, const char *__s,
size_t __n)
{
size_t __b = __bos(__d, 0);
if (__n > __b) {
size_t __sl = strlen(__s);
if (__sl > __n)
__sl = __n;
size_t __dl = strlen(__d);
if (__sl + __dl + 1 > __b)
__builtin_trap();
}
return __orig_strncat(__d, __s, __n);
}
__access (write_only, 1)
__access (read_only, 2, 3)
_FORTIFY_FN(strncpy) char *strncpy(char * _FORTIFY_POS0 __d,
const char *__s, size_t __n)
{
/* trap if pointers are overlapping but not if dst == src.
* gcc seems to like to generate code that relies on dst == src */
if ((__d < __s && __d + __n > __s) ||
(__s < __d && __s + __n > __d))
__builtin_trap();
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __orig_strncpy(__d, __s, __n);
}
#ifdef _GNU_SOURCE
#undef mempcpy
__access(write_only, 1)
__access(read_only, 2, 3)
_FORTIFY_FN(mempcpy) void *mempcpy(void * _FORTIFY_POS0 __d,
const void * _FORTIFY_POS0 __s, size_t __n)
{
size_t __bd = __bos(__d, 0);
size_t __bs = __bos(__s, 0);
if (__n > __bd || __n > __bs)
__builtin_trap();
return __orig_mempcpy(__d, __s, __n);
}
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#undef strlcat
#undef strlcpy
__access (read_write, 1)
__access (read_only, 2, 3)
_FORTIFY_FN(strlcat) size_t strlcat(char * _FORTIFY_POS0 __d,
const char *__s, size_t __n)
{
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __orig_strlcat(__d, __s, __n);
}
__access (write_only, 1)
__access (read_only, 2, 3)
_FORTIFY_FN(strlcpy) size_t strlcpy(char * _FORTIFY_POS0 __d,
const char *__s, size_t __n)
{
size_t __b = __bos(__d, 0);
if (__n > __b)
__builtin_trap();
return __orig_strlcpy(__d, __s, __n);
}
#endif
#ifdef __cplusplus
}
#endif
#endif
#endif
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