From: Florian Westphal <fw@strlen•de>
To: Richard Weinberger <richard@nod•at>
Cc: Florian Westphal <fw@strlen•de>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
Pablo Neira Ayuso <pablo@netfilter•org>,
David Miller <davem@davemloft•net>,
netfilter-devel@vger•kernel.org, coreteam@netfilter•org,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
David Gstir <david@sigma-star•at>,
kaber@trash•net, "keescook@chromium•org" <keescook@chromium•org>
Subject: Re: nf_conntrack: Infoleak via CTA_ID and CTA_EXPECT_ID
Date: Thu, 13 Jul 2017 00:19:35 +0200 [thread overview]
Message-ID: <20170712221935.GC12347@breakpoint.cc> (raw)
In-Reply-To: <1daf1401-5009-df1c-a77a-a271811c0760@nod.at>
Richard Weinberger <richard@nod•at> wrote:
> Am 01.07.2017 um 12:35 schrieb Florian Westphal:
> > The compare on removal is not needed afaics, and its also not used when
> > doing lookup to begin with, so we can just recompute it?
>
> Isn't this a way too much overhead?
I don't think so. This computation only occurs when we dump events
to userspace.
> I personally favor Pablo's per-cpu counter approach.
> That way the IDs are unique again and we get rid of the info leak without
> much effort.
I have not seen these patches so can't really comment.
prev parent reply other threads:[~2017-07-12 22:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-30 19:25 nf_conntrack: Infoleak via CTA_ID and CTA_EXPECT_ID Richard Weinberger
2017-06-30 19:35 ` Florian Westphal
2017-06-30 19:45 ` Richard Weinberger
2017-06-30 19:55 ` Florian Westphal
2017-06-30 20:23 ` Richard Weinberger
2017-07-01 9:44 ` Pablo Neira Ayuso
2017-07-01 10:35 ` Florian Westphal
2017-07-12 21:26 ` Richard Weinberger
2017-07-12 22:19 ` Florian Westphal [this message]
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