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fortify-headers/include/stdlib.h

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Put include guards in the reserved namespace fortify-headers is considered part of the implementation.
2015-03-11 18:55:51 +00:00
#ifndef _FORTIFY_STDLIB_H
#define _FORTIFY_STDLIB_H
Add realpath() check
2015-02-24 19:04:02 +00:00
fix realpath when stdlib.h is included before limits.h If program includes stdlib.h before limits.h without _XOPEN_SOURCE, _GNU_SOURCE or _BSD_SOURCE explicitly set, then will it always trigger the trap with musl libc. This is becase stdlib.h will pull in features.h which will set _GNU_SOURCE. This means that the fortify stdlib.h will not include limits.h but it will still trigger the fortified realpath(), but without PATH_MAX set. We fix this by including system stdlib.h before testing if limits.h should be included. Since PATH_MAX is known at compile time we can also error at compile time, instead of compiling a broken realpath().
2015-05-07 12:50:03 +00:00
#include_next <stdlib.h>
Style fix
2015-02-28 16:11:32 +00:00
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
Add realpath() check
2015-02-24 19:04:02 +00:00
#include_next <limits.h>
#endif
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
Restore C++ support
2015-03-13 23:09:15 +00:00
#ifdef __cplusplus
extern "C" {
#endif
Add ifdef guards for C++ code
2015-03-11 09:26:11 +00:00
Style fix
2015-02-28 16:11:32 +00:00
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
Rework fortify implementation to use extern inline Overriding functions with macros is legal in C but a lot of software is not prepared for it. Use the extern inline method to achieve the same result.
2015-03-13 11:00:46 +00:00
#undef realpath
Use __typeof__ to in part avoid replicating function types
2015-03-14 19:06:48 +00:00
__typeof__(realpath) __realpath_orig __asm__(__USER_LABEL_PREFIX__ "realpath");
Add __artificial__ to aid in debugging
2015-03-14 09:38:11 +00:00
extern __inline __attribute__((__always_inline__,__gnu_inline__,__artificial__))
Rework fortify implementation to use extern inline Overriding functions with macros is legal in C but a lot of software is not prepared for it. Use the extern inline method to achieve the same result.
2015-03-13 11:00:46 +00:00
char *realpath(const char *path, char *resolved)
Add realpath() check
2015-02-24 19:04:02 +00:00
{
size_t bos;
if (resolved) {
__fortify_realpath() should trap if PATH_MAX is not defined This is currently done only if the pointer is non-NULL.
2015-02-28 15:59:27 +00:00
#ifndef PATH_MAX
Minor style fix
2015-05-07 17:04:01 +00:00
#error PATH_MAX unset. A fortified realpath will not work.
__fortify_realpath() should trap if PATH_MAX is not defined This is currently done only if the pointer is non-NULL.
2015-02-28 15:59:27 +00:00
#else
Add realpath() check
2015-02-24 19:04:02 +00:00
bos = __builtin_object_size(resolved, 0);
if (PATH_MAX > bos)
__builtin_trap();
__fortify_realpath() should trap if PATH_MAX is not defined This is currently done only if the pointer is non-NULL.
2015-02-28 15:59:27 +00:00
#endif
Add realpath() check
2015-02-24 19:04:02 +00:00
}
Rework fortify implementation to use extern inline Overriding functions with macros is legal in C but a lot of software is not prepared for it. Use the extern inline method to achieve the same result.
2015-03-13 11:00:46 +00:00
return __realpath_orig(path, resolved);
Add realpath() check
2015-02-24 19:04:02 +00:00
}
#endif
Restore C++ support
2015-03-13 23:09:15 +00:00
#ifdef __cplusplus
}
Add ifdef guards for C++ code
2015-03-11 09:26:11 +00:00
#endif
Add realpath() check
2015-02-24 19:04:02 +00:00
#endif
#endif