Re: Backporting CVE-2020-3702 ath9k patches to stable

On Fri, Aug 20, 2021 at 01:35:05PM +0200, Pali Rohár wrote:

On Wednesday 18 August 2021 11:18:29 Greg KH wrote:

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On Wed, Aug 18, 2021 at 11:10:27AM +0200, Pali Rohár wrote:

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On Wednesday 18 August 2021 11:02:47 Greg KH wrote:

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On Wed, Aug 18, 2021 at 10:48:59AM +0200, Pali Rohár wrote:

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Hello! I would like to request for backporting following ath9k commits
which are fixing CVE-2020-3702 issue.

56c5485c9e44 ("ath: Use safer key clearing with key cache entries")
73488cb2fa3b ("ath9k: Clear key cache explicitly on disabling hardware")
d2d3e36498dd ("ath: Export ath_hw_keysetmac()")
144cd24dbc36 ("ath: Modify ath_key_delete() to not need full key entry")
ca2848022c12 ("ath9k: Postpone key cache entry deletion for TXQ frames reference it")

See also:
https://lore.kernel.org/linux-wireless/87o8hvlx5g.fsf@codeaurora.org/ (local)

This CVE-2020-3702 issue affects ath9k driver in stable kernel versions.
And due to this issue Qualcomm suggests to not use open source ath9k
driver and instead to use their proprietary driver which do not have
this issue.

Details about CVE-2020-3702 are described on the ESET blog post:
https://www.welivesecurity.com/2020/08/06/beyond-kr00k-even-more-wifi-chips-vulnerable-eavesdropping/

Two months ago ESET tested above mentioned commits applied on top of
4.14 stable tree and confirmed that issue cannot be reproduced anymore
with those patches. Commits were applied cleanly on top of 4.14 stable
tree without need to do any modification.

What stable tree(s) do you want to see these go into?

Commits were introduced in 5.12, so it should go to all stable trees << 5.12

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And what order are the above commits to be applied in, top-to-bottom or
bottom-to-top?

Same order in which were applied in 5.12. So first commit to apply is
56c5485c9e44, then 73488cb2fa3b and so on... (from top of the email to
the bottom of email).

Great, all now queued up.  Sad that qcom didn't want to do this
themselves :(

greg k-h

It is sad, but Qualcomm support said that they have fixed it in their
proprietary driver in July 2020 (so more than year ago) and that open
source drivers like ath9k are unsupported and customers should not use
them :( And similar answer is from vendors who put these chips into
their cards / products.

Is there a public statement that says that? Right now the MAINTAINERS
file says it's "supported" and if it's not the case we should at least
fix that and consider deprecating it if it's really orphaned.

-- 
Thanks,
Sasha