From 7b789836f434c87168eab067cfbed1ec4783dffd Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Wed, 19 Sep 2012 11:33:40 +0000 Subject: xfrm_user: fix info leak in copy_to_user_policy() The memory reserved to dump the xfrm policy includes multiple padding bytes added by the compiler for alignment (padding bytes in struct xfrm_selector and struct xfrm_userpolicy_info). Add an explicit memset(0) before filling the buffer to avoid the heap info leak. Signed-off-by: Mathias Krause Acked-by: Steffen Klassert Signed-off-by: David S. Miller --- net/xfrm/xfrm_user.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net') diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index d585459dc8bb..84dd85ceeeea 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1320,6 +1320,7 @@ static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) { + memset(p, 0, sizeof(*p)); memcpy(&p->sel, &xp->selector, sizeof(p->sel)); memcpy(&p->lft, &xp->lft, sizeof(p->lft)); memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); -- cgit v1.2.3