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Date: Wed, 19 Sep 2012 23:33:41 +0200 From: Mathias Krause <minipli@...glemail.com> To: "David S. Miller" <davem@...emloft.net> Cc: Steffen Klassert <steffen.klassert@...unet.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Mathias Krause <minipli@...glemail.com>, Brad Spengler <spender@...ecurity.net> Subject: [PATCH 4/6] 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@...ecurity.net> 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 7511427..9f1e749 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1423,6 +1423,7 @@ 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)); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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