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authorMathias Krause <minipli@googlemail.com>2012-09-19 11:33:40 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-13 05:28:04 +0900
commita601da719c73cedba80c788719594990e30a972f (patch)
tree01a60f33128e680dece2bbaf2cd860b4bd2d265e /net
parent2f21f42628061faa605c76c53449a325597137a7 (diff)
xfrm_user: fix info leak in copy_to_user_policy()
[ Upstream commit 7b789836f434c87168eab067cfbed1ec4783dffd ] 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 <minipli@googlemail.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/xfrm/xfrm_user.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 8e878ebf49a5..b5215b40c815 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1300,6 +1300,7 @@ 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));