netdev - [PATCH net 2/4] xfrm_user: fix info leak in xfrm_notify

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Message-Id: <1503760140-9095-3-git-send-email-minipli@googlemail.com>
Date:   Sat, 26 Aug 2017 17:08:58 +0200
From:   Mathias Krause <minipli@...glemail.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>
Cc:     netdev@...r.kernel.org, Mathias Krause <minipli@...glemail.com>
Subject: [PATCH net 2/4] xfrm_user: fix info leak in xfrm_notify_sa()

The memory reserved to dump the ID of the xfrm state includes a padding
byte in struct xfrm_usersa_id added by the compiler for alignment. To
prevent the heap info leak, memset(0) the whole struct before filling
it.

Cc: Herbert Xu <herbert@...dor.apana.org.au>
Fixes: 0603eac0d6b7 ("[IPSEC]: Add XFRMA_SA/XFRMA_POLICY for delete notification")
Signed-off-by: Mathias Krause <minipli@...glemail.com>
---
 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 3259555ae7d7..c33516ef52f2 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2715,6 +2715,7 @@ static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
 		struct nlattr *attr;
 
 		id = nlmsg_data(nlh);
+		memset(id, 0, sizeof(*id));
 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
 		id->spi = x->id.spi;
 		id->family = x->props.family;
-- 
1.7.10.4