50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
|
/* See LICENSE file for copyright and license details. */
|
||
|
#ifndef FORTIFY_UNISTD_H_
|
||
|
#define FORTIFY_UNISTD_H_
|
||
|
|
||
|
#include_next <unistd.h>
|
||
|
|
||
|
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
|
||
|
|
||
|
#define __errordecl(name, msg) extern void name(void) __attribute__((__error__(msg)))
|
||
|
|
||
|
__errordecl(__read_error, "read: buffer overflow detected");
|
||
|
static inline __attribute__ ((always_inline))
|
||
|
ssize_t
|
||
|
__fortify_read(int fd, void *buf, size_t n)
|
||
|
{
|
||
|
size_t bos = __builtin_object_size(buf, 0);
|
||
|
|
||
|
if (__builtin_constant_p(n) && n > bos)
|
||
|
__read_error();
|
||
|
|
||
|
if (n > bos)
|
||
|
__builtin_trap();
|
||
|
return read(fd, buf, n);
|
||
|
}
|
||
|
|
||
|
__errordecl(__write_error, "write: buffer overflow detected");
|
||
|
static inline __attribute__ ((always_inline))
|
||
|
ssize_t
|
||
|
__fortify_write(int fd, void *buf, size_t n)
|
||
|
{
|
||
|
size_t bos = __builtin_object_size(buf, 0);
|
||
|
|
||
|
if (__builtin_constant_p(n) && n > bos)
|
||
|
__write_error();
|
||
|
|
||
|
if (n > bos)
|
||
|
__builtin_trap();
|
||
|
return write(fd, buf, n);
|
||
|
}
|
||
|
|
||
|
#undef read
|
||
|
#define read(fd, buf, n) __fortify_read(fd, buf, n)
|
||
|
|
||
|
#undef write
|
||
|
#define write(fd, buf, n) __fortify_write(fd, buf, n)
|
||
|
|
||
|
#endif
|
||
|
|
||
|
#endif
|