fortify-headers

commit 52d4c979802345f03193258af7f120de4bcae1ff
parent 2f6dc9f34ff30887dd81d98e7e2a2b7e7ff8b431
Author: sin <sin@2f30.org>
Date:   Thu, 29 Jan 2015 10:43:00 +0000

Add bcopy() checks

Diffstat:
A
include/strings.h
 | 
28
++++++++++++++++++++++++++++

1 file changed, 28 insertions(+), 0 deletions(-)
diff --git a/include/strings.h b/include/strings.h
@@ -0,0 +1,28 @@
+#ifndef FORTIFY_STRINGS_H_
+#define FORTIFY_STRINGS_H_
+
+#include_next <strings.h>
+
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_POSIX_SOURCE) \
+ || (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE+0 < 200809L) \
+ || (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE+0 < 700)
+
+static inline __attribute__ ((always_inline))
+void __fortify_bcopy(const void *__restrict src, void *__restrict dest, size_t n)
+{
+	size_t bos = __builtin_object_size(dest, 0);
+
+	if (n > bos)
+		__builtin_trap();
+	return bcopy(src, dest, n);
+}
+
+#undef bcopy
+#define bcopy(src, dest, n) __fortify_bcopy(src, dest, n)
+#endif
+
+#endif
+
+#endif