From: Mathias Krause <minipli@googlemail.com>
Date: Sat, 26 Aug 2017 15:09:00 +0000 (+0200)
Subject: xfrm_user: fix info leak in build_aevent()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=931e79d7a7ddee4709c56b39de169a36804589a1;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

xfrm_user: fix info leak in build_aevent()

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 sa_id before filling it.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Fixes: d51d081d6504 ("[IPSEC]: Sync series - user")
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 2cbdc81610c6..9391ced05259 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1869,6 +1869,7 @@ static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct
 		return -EMSGSIZE;
 
 	id = nlmsg_data(nlh);
+	memset(&id->sa_id, 0, sizeof(id->sa_id));
 	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
 	id->sa_id.spi = x->id.spi;
 	id->sa_id.family = x->props.family;