From cd9e882cd1d684f50c52471d83f9ecf55427c360 Mon Sep 17 00:00:00 2001 From: mancha security Date: Wed, 18 Mar 2015 16:14:34 +0000 Subject: [PATCH] lib/string.c: use barrier() to protect memzero_explicit() OPTIMIZER_HIDE_VAR(), as defined when using gcc, is insufficient to ensure protection from dead store optimization. --- lib/string.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/string.c b/lib/string.c index ce81aae..a579201 100644 --- a/lib/string.c +++ b/lib/string.c @@ -607,7 +607,7 @@ EXPORT_SYMBOL(memset); void memzero_explicit(void *s, size_t count) { memset(s, 0, count); - OPTIMIZER_HIDE_VAR(s); + barrier(); } EXPORT_SYMBOL(memzero_explicit); -- 2.1.4