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xfrm_user: fix info leak in copy_to_user_state()

The memory reserved to dump the xfrm state includes the padding bytes of
struct xfrm_usersa_info added by the compiler for alignment (7 for
amd64, 3 for i386). Add an explicit memset(0) before filling the buffer
to avoid the info leak.

Signed-off-by: Mathias Krause <>
Acked-by: Steffen Klassert <>
Signed-off-by: David S. Miller <>
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1 parent 4c87308 commit f778a636713a435d3a922c60b1622a91136560c1 @minipli minipli committed with davem330 Sep 19, 2012
Showing with 1 addition and 0 deletions.
  1. +1 −0 net/xfrm/xfrm_user.c
1 net/xfrm/xfrm_user.c
@@ -689,6 +689,7 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
+ memset(p, 0, sizeof(*p));
memcpy(&p->id, &x->id, sizeof(p->id));
memcpy(&p->sel, &x->sel, sizeof(p->sel));
memcpy(&p->lft, &x->lft, sizeof(p->lft));

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