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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_STDIO_H
#define _FORTIFY_STDIO_H
#if !defined(__cplusplus) && !defined(__clang__)
__extension__
#endif
#include_next <stdio.h>
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
#include "fortify-headers.h"
#ifdef __cplusplus
extern "C" {
#endif
#undef fgets
#undef fread
#undef fwrite
#undef vsprintf
#undef vsnprintf
#undef snprintf
#undef sprintf
__access(read_write, 1, 2)
__access(read_only, 3)
_FORTIFY_FN(fgets) char *fgets(char * _FORTIFY_POS0 __s, int __n, FILE *__f)
{
size_t __b = __bos(__s, 0);
if ((size_t)__n > __b)
__builtin_trap();
return __orig_fgets(__s, __n, __f);
}
__access(write_only, 1)
__access(read_only, 4)
_FORTIFY_FN(fread) size_t fread(void * _FORTIFY_POS0 __d, size_t __n,
size_t __m, FILE *__f)
{
size_t __b = __bos(__d, 0);
if (__n != 0 && (__n * __m) / __n != __m)
__builtin_trap();
if (__n * __m > __b)
__builtin_trap();
return __orig_fread(__d, __n, __m, __f);
}
__access(read_only, 1)
__access(write_only, 4)
_FORTIFY_FN(fwrite) size_t fwrite(const void * _FORTIFY_POS0 __d, size_t __n,
size_t __m, FILE *__f)
{
size_t __b = __bos(__d, 0);
if (__n != 0 && (__n * __m) / __n != __m)
__builtin_trap();
if (__n * __m > __b)
__builtin_trap();
return __orig_fwrite(__d, __n, __m, __f);
}
__fortify__format(printf, 3, 0)
__access(write_only, 1, 2)
__access(read_only, 3)
_FORTIFY_FN(vsnprintf) int vsnprintf(char * _FORTIFY_POS0 __s, size_t __n,
const char *__f, __builtin_va_list __v)
{
size_t __b = __bos(__s, 0);
if (__n > __b)
__builtin_trap();
return __orig_vsnprintf(__s, __n, __f, __v);
}
__fortify__format(printf, 2, 0)
__access(write_only, 1)
__access(read_only, 2)
_FORTIFY_FN(vsprintf) int vsprintf(char * _FORTIFY_POS0 __s, const char *__f,
__builtin_va_list __v)
{
size_t __b = __bos(__s, 0);
int __r;
if (__b != (size_t)-1) {
__r = __orig_vsnprintf(__s, __b, __f, __v);
if (__r != -1 && (size_t)__r >= __b)
__builtin_trap();
} else {
__r = __orig_vsprintf(__s, __f, __v);
}
return __r;
}
#if defined(__has_builtin)
#if __has_builtin(__builtin_va_arg_pack)
/* clang is missing __builtin_va_arg_pack, so we cannot use these impls
* outside of gcc; we then have a few options:
*
* 1) using va_start/end and implementing these functions as static inline,
* with inlining never happening; that means extra symbols with internal
* linkage, which is not ideal
* 2) using macros; this is incompatible with c++ and since musl does not
* have the __chk variants, we'd need to implement a body with intermediate
* variables within the macro, which means more non-portable mess
* 3) not implementing these under clang, which is what we do for now
*/
__fortify__format(printf, 3, 4)
_FORTIFY_FN(snprintf) int snprintf(char *__s, size_t __n,
const char *__f, ...)
{
size_t __b = __bos(__s, 0);
if (__n > __b)
__builtin_trap();
return __orig_snprintf(__s, __n, __f, __builtin_va_arg_pack());
}
__fortify__format(printf, 2, 3)
_FORTIFY_FN(sprintf) int sprintf(char *__s, const char *__f, ...)
{
size_t __b = __bos(__s, 0);
int __r;
if (__b != (size_t)-1) {
__r = __orig_snprintf(__s, __b, __f, __builtin_va_arg_pack());
if (__r != -1 && (size_t)__r >= __b)
__builtin_trap();
} else {
__r = __orig_sprintf(__s, __f, __builtin_va_arg_pack());
}
return __r;
}
#endif /* __has_builtin(__builtin_va_arg_pack) */
#endif /* defined(__has_builtin) */
#ifdef __cplusplus
}
#endif
#endif
#endif
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