Add bcopy() checks

1 files changed, 28 insertions, 0 deletions

diff --git a/include/strings.h b/include/strings.h
new file mode 100644
index 0000000..db08cc9
--- /dev/null
+++ 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