linux-kernel - Re: [PATCH v2] net: tls: fix possible info leak in tls_set_device

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Message-ID: <Y/kcfM5jWrQhdYFR@hog>
Date:   Fri, 24 Feb 2023 21:22:20 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Hangyu Hua <hbh25y@...il.com>, borisp@...dia.com,
        john.fastabend@...il.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, ilyal@...lanox.com, aviadye@...lanox.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: tls: fix possible info leak in
 tls_set_device_offload()

2023-02-24, 10:57:29 -0800, Jakub Kicinski wrote:
> On Fri, 24 Feb 2023 18:28:39 +0800 Hangyu Hua wrote:
> > After tls_set_device_offload() fails, we enter tls_set_sw_offload(). But
> > tls_set_sw_offload can't set cctx->iv and cctx->rec_seq to NULL if it fails
> > before kmalloc cctx->iv. It is better to Set them to NULL to avoid any
> > potential info leak.
> 
> Please show clear chain of events which can lead to a use-after-free 
> or info leak. And if you can't please don't send the patch.

Sorry, I thought in this morning's discussion Hangyu had agreed to
remove all mentions of possible info leak while sending v2, since we
agreed [1] that this patch didn't fix any issue, just that it looked
more consistent, as tls_set_sw_offload NULLs iv and rec_seq on
failure. We can also drop the patch completely. Anyway since net-next
is closed, I should have told Hangyu to wait for 2 weeks.

[1] https://lore.kernel.org/all/310391ea-7c71-395e-5dcb-b0a983e6fc93@gmail.com/

-- 
Sabrina