From: Pavel Filipenský <pfilipensky@samba.org>
Date: Mon, 8 Aug 2022 15:47:28 +0000 (+0200)
Subject: lib:replace: Add macro BURN_STR() to zero memory of a string
X-Git-Tag: talloc-2.4.0~1328
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8564380346ace981b957bb8464f2ecf007032062;p=thirdparty%2Fsamba.git

lib:replace: Add macro BURN_STR() to zero memory of a string

Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
---

diff --git a/lib/replace/replace.h b/lib/replace/replace.h
index da5526c4a2f..bd7f6e53e81 100644
--- a/lib/replace/replace.h
+++ b/lib/replace/replace.h
@@ -864,6 +864,17 @@ typedef unsigned long long ptrdiff_t ;
  */
 #define BURN_PTR_SIZE(x, s) memset_s((x), (s), 0, (s))
 
+/**
+ * Explicitly zero data in string. This is guaranteed to be not optimized
+ * away.
+ */
+#define BURN_STR(x)	do { \
+				if ((x) != NULL) { \
+					size_t s = strlen(x); \
+					memset_s((x), s, 0, s); \
+				} \
+			} while(0)
+
 /**
  * Work out how many elements there are in a static array.
  */