fortify-headers

commit e8e2d1214a49f3c268fb5f3a92e8144b23e35243
parent 1457895d6b34cf2bfc5fddd56becaa08d4b2edfe
Author: jvoisin <julien.voisin@dustri.org>
Date:   Fri,  1 May 2026 00:48:04 +0200

Don't leak PATH_MAX' #define

Apparently, some horrible systems are leaving PATH_MAX *intentionally*
undefined, as paths can be unbounded there. We don't want to silently
introduced a limit in the trnaslation unit, so let's undefine it at the end of
the function.

Diffstat:
M
include/stdlib.h
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/stdlib.h b/include/stdlib.h
@@ -45,6 +45,7 @@ _FORTIFY_FN(realpath) char *realpath(const char *__p, char *__r)
 #ifndef PATH_MAX
 /* see man realpath(3) */
 #define PATH_MAX 4096
+#define _FORTIFY_UNDEF_PATH_MAX
 #endif
 	if (__r && PATH_MAX > __bos(__r, 2)) {
 		char __buf[PATH_MAX], *__ret;
@@ -61,6 +62,10 @@ _FORTIFY_FN(realpath) char *realpath(const char *__p, char *__r)
 	}
 	return __orig_realpath(__p, __r);
 }
+#ifdef _FORTIFY_UNDEF_PATH_MAX
+#undef PATH_MAX
+#undef _FORTIFY_UNDEF_PATH_MAX
+#endif
 #endif
 
 #ifdef __cplusplus