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authorMathias Krause <minipli@googlemail.com>2012-09-19 11:33:41 +0000
committerDavid S. Miller <davem@davemloft.net>2012-09-20 18:08:40 -0400
commit1f86840f897717f86d523a13e99a447e6a5d2fa5 (patch)
tree03c775c5e0db9f885d7dd24fd7f4d8ebf0caf2eb /net
parent7b789836f434c87168eab067cfbed1ec4783dffd (diff)
xfrm_user: fix info leak in copy_to_user_tmpl()
The memory used for the template copy is a local stack variable. As struct xfrm_user_tmpl contains multiple holes added by the compiler for alignment, not initializing the memory will lead to leaking stack bytes to userland. Add an explicit memset(0) to avoid the info leak. Initial version of the patch by Brad Spengler. Cc: Brad Spengler <spender@grsecurity.net> 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>
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 84dd85ceeee..8024b3dea8c 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1425,6 +1425,7 @@ static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
struct xfrm_user_tmpl *up = &vec[i];
struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
+ memset(up, 0, sizeof(*up));
memcpy(&up->id, &kp->id, sizeof(up->id));
up->family = kp->encap_family;
memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));