From: Simon Horman <simon.horman@corigine.com>
To: Florian Westphal <fw@strlen.de>
Cc: netdev@vger.kernel.org, jhs@mojatatu.com,
xiyou.wangcong@gmail.com, jiri@resnulli.us
Subject: Re: [PATCH net 1/3] net/sched: act_ipt: add sanity checks on table name and hook locations
Date: Thu, 8 Jun 2023 12:44:25 +0200 [thread overview]
Message-ID: <ZIGxCWZJoSGJZiUw@corigine.com> (raw)
In-Reply-To: <20230607145954.19324-2-fw@strlen.de>
On Wed, Jun 07, 2023 at 04:59:52PM +0200, Florian Westphal wrote:
> Looks like "tc" hard-codes "mangle" as the only supported table
> name, but on kernel side there are no checks.
>
> This is wrong. Not all xtables targets are safe to call from tc.
> E.g. "nat" targets assume skb has a conntrack object assigned to it.
> Normally those get called from netfilter nat core which consults the
> nat table to obtain the address mapping.
>
> "tc" userspace either sets PRE or POSTROUTING as hook number, but there
> is no validation of this on kernel side, so update netlink policy to
> reject bogus numbers. Some targets may assume skb_dst is set for
> input/forward hooks, so prevent those from being used.
>
> act_ipt uses the hook number in two places:
> 1. the state hook number, this is fine as-is
> 2. to set par.hook_mask
>
> The latter is a bit mask, so update the assignment to make
> xt_check_target() to the right thing.
>
> Followup patch adds required checks for the skb/packet headers before
> calling the targets evaluation function.
>
> Signed-off-by: Florian Westphal <fw@strlen.de>
Hi Florian,
I think that patches for 'net' usually come with a fixes tag.
Likewise for the other patches in this series.
That aside, this looks good to me.
Reviewed-by: Simon Horman <simon.horman@corigine.com>
next prev parent reply other threads:[~2023-06-08 10:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-07 14:59 [PATCH net 0/3] net/sched: act_ipt bug fixes Florian Westphal
2023-06-07 14:59 ` [PATCH net 1/3] net/sched: act_ipt: add sanity checks on table name and hook locations Florian Westphal
2023-06-08 10:44 ` Simon Horman [this message]
2023-06-08 13:57 ` Florian Westphal
2023-06-08 16:44 ` Jamal Hadi Salim
2023-06-07 14:59 ` [PATCH net 2/3] net/sched: act_ipt: add sanity checks on skb before calling target Florian Westphal
2023-06-08 10:44 ` Simon Horman
2023-06-07 14:59 ` [PATCH net 3/3] net/sched: act_ipt: zero skb->cb " Florian Westphal
2023-06-08 10:45 ` Simon Horman
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