netdev - Re: Posible memory corruption from "mac80211: do not accept/forward invalid EAPOL frames"

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Date:   Fri, 9 Jul 2021 22:48:06 +0300
From:   Davis Mosenkovs <davikovs@...il.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Felix Fietkau <nbd@....name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Posible memory corruption from "mac80211: do not accept/forward
 invalid EAPOL frames"

On 2021-07-02 at 09:54 Johannes Berg (<johannes@...solutions.net>) wrote:
>
> > If testing procedure mentioned in my first email is sufficient (and
> > using skb->data is the correct solution in kernel trees where current
> > code doesn't work properly), I can make and test the patches.
> > Should I do that?
>
> Yes, please do.
>
> Thanks,
> johannes
>
I have done the testing on kernel versions 4.4.274, 4.9.274, 4.14.238,
4.19.196, 5.4.130, 5.10.48, 5.12.15 and 5.13.1.
Only kernels 4.4.274, 4.9.274 and 4.14.238 are affected.
On kernels 4.19.196, 5.4.130, 5.10.48, 5.12.15 and 5.13.1 current code
works properly (and skb->data produces incorrect pointer when used
instead of skb_mac_header()).
I have submitted patches for the affected kernel versions:
https://lore.kernel.org/r/20210707213800.1087974-1-davis@mosenkovs.lv
https://lore.kernel.org/r/20210707213820.1088026-1-davis@mosenkovs.lv
https://lore.kernel.org/r/20210707213834.1088078-1-davis@mosenkovs.lv

Best regards,
Davis