linux-kernel - Re: [PATCH] NFC: nci: Bounds check struct nfc

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Message-ID: <a2458e6a-6b19-cd67-2b84-5cef6388e011@linaro.org>
Date:   Mon, 5 Dec 2022 09:17:24 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     syzbot+210e196cef4711b65139@...kaller.appspotmail.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        "John W. Linville" <linville@...driver.com>,
        Ilan Elias <ilane@...com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] NFC: nci: Bounds check struct nfc_target arrays

On 02/12/2022 22:44, Kees Cook wrote:
> While running under CONFIG_FORTIFY_SOURCE=y, syzkaller reported:
> 
>   memcpy: detected field-spanning write (size 129) of single field "target->sensf_res" at net/nfc/nci/ntf.c:260 (size 18)
> 
> This appears to be a legitimate lack of bounds checking in
> nci_add_new_protocol(). Add the missing checks.
> 
> Reported-by: syzbot+210e196cef4711b65139@...kaller.appspotmail.com
> Link: https://lore.kernel.org/lkml/0000000000001c590f05ee7b3ff4@google.com
> Fixes: 019c4fbaa790 ("NFC: Add NCI multiple targets support")
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof