From: Andreas Schneider <asn@samba.org>
Date: Tue, 19 Jul 2022 11:36:57 +0000 (+0200)
Subject: lib:replace: Add macros to burn data from memory
X-Git-Tag: samba-4.17.0rc1~241
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8b22b448e84269f6f18c0e08d9ff1f0edeae0d31;p=thirdparty%2Fsamba.git

lib:replace: Add macros to burn data from memory

This will explicitly zero data from memory. This is guaranteed to be not
optimized away.

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
---

diff --git a/lib/replace/replace.h b/lib/replace/replace.h
index a8910e2b5e4..da5526c4a2f 100644
--- a/lib/replace/replace.h
+++ b/lib/replace/replace.h
@@ -846,6 +846,24 @@ typedef unsigned long long ptrdiff_t ;
  */
 #define ZERO_ARRAY_LEN(x, l) memset_s((char *)(x), (l), 0, (l))
 
+/**
+ * Explicitly zero data from memory. This is guaranteed to be not optimized
+ * away.
+ */
+#define BURN_DATA(x) memset_s((char *)&(x), sizeof(x), 0, sizeof(x))
+
+/**
+ * Explicitly zero data from memory. This is guaranteed to be not optimized
+ * away.
+ */
+#define BURN_DATA_SIZE(x, s) memset_s((char *)&(x), (s), 0, (s))
+
+/**
+ * Explicitly zero data from memory. This is guaranteed to be not optimized
+ * away.
+ */
+#define BURN_PTR_SIZE(x, s) memset_s((x), (s), 0, (s))
+
 /**
  * Work out how many elements there are in a static array.
  */