linux-kernel - Re: KASAN: slab-use-after-free Read in nfc_llcp_unregister

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Message-ID: <32edfc3c-321e-4816-b634-7b9540ab8c47@linaro.org>
Date:   Wed, 25 Oct 2023 09:23:18 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Abagail ren <renzezhongucas@...il.com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com
Subject: Re: KASAN: slab-use-after-free Read in nfc_llcp_unregister_device

On 25/10/2023 08:27, Abagail ren wrote:
> Good day, dear maintainers.
> 
> Since the email system replied that it refused to accept the email because
> the text contained HTML, I sent it to you again in the form of shared files.
> 
> We found a bug using a modified kernel configuration file used by syzbot.
> 
> We enhanced the probability of vulnerability discovery using our prototype
> system developed based on syzkaller and found a bug "' KASAN:
> slab-use-after-free Read in nfc_llcp_unregister_device." I'm still working
> on it to find out its root cause and availability.
> 
> The stack information:
> https://docs.google.com/document/d/1gdHebCRsvVsSPKfilcoXVu3Pctvoj2FSZCACcVYZXns/edit?usp=sharing
> 
> Kernel Branch: 6.4.0-rc3
> 

Hi,

I received two emails from you, so I am not sure if these are separate
issues or not.

Anyway, there were fixes to these paths and you are testing quite old
kernel. If you have the reproducer, it should be straightforward to test
new kernel, so please do so. Test on linux-next.

> Kernel Config:
> https://docs.google.com/document/d/1WIM0btqS2dex18HQYaL2xyoW6WdX2TsaNguTnWzHMps/edit?usp=sharing
> 
> Reproducer:
> https://docs.google.com/document/d/1LrgGdOgZwO8wz0opusZ7flP9QSFZa32GdozvoxGysyY/edit?usp=sharing


Best regards,
Krzysztof