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Add recv() checks

This commit is contained in:
sin 2015-01-30 16:43:36 +00:00
parent 6f0d1a1b6f
commit aa095b6d52
1 changed files with 31 additions and 0 deletions
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31
include/sys/socket.h Normal file
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/* See LICENSE file for copyright and license details. */
#ifndef FORTIFY_SYS_SOCKET_H_
#define FORTIFY_SYS_SOCKET_H_
#include_next <sys/socket.h>
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
#define __errordecl(name, msg) extern void name(void) __attribute__((__error__(msg)))
__errordecl(__recv_error, "recv: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
__fortify_recv(int sockfd, void *buf, size_t n, int flags)
{
size_t bos = __builtin_object_size(buf, 0);
if (__builtin_constant_p(n) && n > bos)
__recv_error();
if (n > bos)
__builtin_trap();
return recv(sockfd, buf, n, flags);
}
#undef recv
#define recv(sockfd, buf, n, flags) __fortify_recv(sockfd, buf, n, flags)
#endif
#endif