From 0c5e37586ef83845acbae1738e693bc97c12d4c3 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Wed, 19 Sep 2012 11:33:41 +0000 Subject: [PATCH] xfrm_user: fix info leak in copy_to_user_tmpl() [ Upstream commit 1f86840f897717f86d523a13e99a447e6a5d2fa5 ] The memory used for the template copy is a local stack variable. As struct xfrm_user_tmpl contains multiple holes added by the compiler for alignment, not initializing the memory will lead to leaking stack bytes to userland. Add an explicit memset(0) to avoid the info leak. Initial version of the patch by Brad Spengler. Signed-off-by: Mathias Krause Cc: Brad Spengler Acked-by: Steffen Klassert Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/xfrm/xfrm_user.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 4ec3ccd7d517..74ea70f5f358 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1405,6 +1405,7 @@ static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) struct xfrm_user_tmpl *up = &vec[i]; struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; + memset(up, 0, sizeof(*up)); memcpy(&up->id, &kp->id, sizeof(up->id)); up->family = kp->encap_family; memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); -- 2.39.2