commit 346177255931fb1e3514e124a1f598715a5fe92d
author Paul Bakker <p.j.bakker@polarssl.org> Fri Jun 13 17:20:13 2014 +0200
committer Paul Bakker <p.j.bakker@polarssl.org> Sat Jun 14 16:46:03 2014 +0200
tree da658994944be861b8b2a1001c9b759976276891
parent bbcb1ce7030575d708700ca205800e847d846402

Introduce polarssl_zeroize() instead of memset() for zeroization

library/ssl_srv.c

diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index a4bf1ab..cd207c5 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -52,6 +52,11 @@
 #endif
 
 #if defined(POLARSSL_SSL_SESSION_TICKETS)
+/* Implementation that should never be optimized out by the compiler */
+static void polarssl_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
 /*
  * Serialize a session in the following format:
  *  0   .   n-1     session structure, n = sizeof(ssl_session)
@@ -337,7 +342,7 @@
 
     ssl_session_free( ssl->session_negotiate );
     memcpy( ssl->session_negotiate, &session, sizeof( ssl_session ) );
-    memset( &session, 0, sizeof( ssl_session ) );
+    polarssl_zeroize( &session, sizeof( ssl_session ) );
 
     return( 0 );
 }