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Only crash on overflow for realpath()

This commit is contained in:
sin 2015-07-16 11:45:19 +01:00
parent edb2ded3af
commit 60dcebb6b8
1 changed files with 11 additions and 3 deletions
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14
include/stdlib.h
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@ -35,15 +35,23 @@ extern "C" {
#undef realpath
_FORTIFY_FN(realpath) char *realpath(const char *__p, char *__r)
{
size_t __b;
size_t __b = __builtin_object_size(__r, 0);
if (__r) {
#ifndef PATH_MAX
#error PATH_MAX unset. A fortified realpath will not work.
#else
__b = __builtin_object_size(__r, 0);
if (PATH_MAX > __b)
char __buf[PATH_MAX], *__ret;
size_t __l;
__ret = __orig_realpath(__p, __buf);
if (!__ret)
return NULL;
__l = __builtin_strlen(__ret) + 1;
if (__l > __b)
__builtin_trap();
__builtin_memcpy(__r, __ret, __l);
return __r;
#endif
}
return __orig_realpath(__p, __r);