netdev - Re: [Patch net] net_sched: add max len check for TCA

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Date:   Wed, 18 Sep 2019 22:15:24 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        syzbot <syzbot+618aacd49e8c8b8486bd@...kaller.appspotmail.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [Patch net] net_sched: add max len check for TCA_KIND

On Wed, Sep 18, 2019 at 7:41 PM David Ahern <dsahern@...il.com> wrote:
>
> On 9/18/19 5:24 PM, Cong Wang wrote:
> > The TCA_KIND attribute is of NLA_STRING which does not check
> > the NUL char. KMSAN reported an uninit-value of TCA_KIND which
> > is likely caused by the lack of NUL.
> >
> > Change it to NLA_NUL_STRING and add a max len too.
> >
> > Fixes: 8b4c3cdd9dd8 ("net: sched: Add policy validation for tc attributes")
>
> The commit referenced here did not introduce the ability to go beyond
> memory boundaries with string comparisons. Rather, it was not complete
> solution for attribute validation. I say that wrt to the fix getting
> propagated to the correct stable releases.

I think this patch should be backported to wherever commit 8b4c3cdd9dd8
goes, this is why I picked it as Fixes.

>
> > Reported-and-tested-by: syzbot+618aacd49e8c8b8486bd@...kaller.appspotmail.com
>
> What is the actual sysbot report?

https://marc.info/?l=linux-kernel&m=156862916112881&w=2