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xfrm_user: fix info leak in copy_to_user_state()

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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 <minipli@googlemail.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mathias Krause 2012-09-19 11:33:39 +00:00 committed by David S. Miller
parent 4c87308bde
commit f778a63671
1 changed files with 1 additions and 0 deletions
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net/xfrm/xfrm_user.c
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@ -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));