netdev - Re: [PATCH net 2/7] tls: fix race between async notify and socket close

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Date: Fri, 9 Feb 2024 09:24:35 +0000
From: Simon Horman <horms@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
	pabeni@...hat.com, sd@...asysnail.net, vadim.fedorenko@...ux.dev,
	valis <sec@...is.email>, borisp@...dia.com,
	john.fastabend@...il.com, vinay.yadav@...lsio.com
Subject: Re: [PATCH net 2/7] tls: fix race between async notify and socket
 close

On Tue, Feb 06, 2024 at 05:18:19PM -0800, Jakub Kicinski wrote:
> The submitting thread (one which called recvmsg/sendmsg)
> may exit as soon as the async crypto handler calls complete()
> so any code past that point risks touching already freed data.
> 
> Try to avoid the locking and extra flags altogether.
> Have the main thread hold an extra reference, this way
> we can depend solely on the atomic ref counter for
> synchronization.
> 
> Don't futz with reiniting the completion, either, we are now
> tightly controlling when completion fires.
> 
> Reported-by: valis <sec@...is.email>
> Fixes: 0cada33241d9 ("net/tls: fix race condition causing kernel panic")
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Reviewed-by: Simon Horman <horms@...nel.org>