CVE-2020-3702: Firmware updates for ath9k and ath10k chips

[Michał Kazior]

On Wed, 12 Aug 2020 at 11:26, Jouni Malinen <j at w1.fi> wrote:
>
> On Wed, Aug 12, 2020 at 11:17:47AM +0200, Toke Høiland-Jørgensen wrote:
> > Pali Rohár <pali at kernel.org> writes:
> > > Could somebody react and provide some details when fixes would be
> > > available for ath9k and ath10k Linux drivers? And what is current state
> > > of this issue for Linux?
> > >
> > > I'm looking at ath9k and ath10k git trees [1] [2] [3] and I do not see
> > > there any change which could be related to CVE-2020-3702.
> >
> > How about these, from March:
> >
> > a0761a301746 ("mac80211: drop data frames without key on encrypted links")
> > ce2e1ca70307 ("mac80211: Check port authorization in the ieee80211_tx_dequeue() case")
> > b16798f5b907 ("mac80211: mark station unauthorized before key removal")
>
> Those cover most of the identified issues for drivers using mac80211
> (e.g., ath9k and ath10k; though, I don't remember whether I actually
> ever managed to reproduce this with ath10k in practice). I have couple
> of additional ath9k-specific patches that cover additional lower layer
> paths for this. I hope to get those out after confirming they work with
> the current kernel tree snapshot.

As far as I understand the problem can manifest on partial in-hw ampdu
retransmits if a key was removed in between. Not exactly an easy thing
to reproduce. The actual drivers (ath9k, ath10k) or their microcodes
may need to be fixed as well since mac80211 can only do so much.


Michal