Add bcopy() checks

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