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Add read()/write() checks

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sin 2015-01-29 20:31:30 +00:00
parent 0784beab02
commit 647c25ad9c
1 changed files with 49 additions and 0 deletions
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49
include/unistd.h Normal file
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/* 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