linux-kernel - Re: There is an array-index-out-bounds bug in detach_capi

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Date:   Tue, 28 Sep 2021 16:35:39 +0800
From:   butt3rflyh4ck <butterflyhuangxx@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Karsten Keil <isdn@...ux-pingi.de>,
        "David S. Miller" <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>
Subject: Re: There is an array-index-out-bounds bug in detach_capi_ctr in drivers/isdn/capi/kcapi.c

Hi, I make a patch for this issue.

Regards,
 butt3rflyh4ck.


On Fri, Sep 24, 2021 at 6:02 PM butt3rflyh4ck
<butterflyhuangxx@...il.com> wrote:
>
> > When I last touched the capi code, I tried to remove it all, but we then
> > left it in the kernel because the bluetooth cmtp code can still theoretically
> > use it.
> >
> > May I ask how you managed to run into this? Did you find the bug through
> > inspection first and then produce it using cmtp, or did you actually use
> > cmtp?
>
> I fuzz the bluez system and find a crash to analyze it and reproduce it.
>
> > If the only purpose of cmtp is now to be a target for exploits, then I
> > would suggest we consider removing both cmtp and capi for
> > good after backporting your fix to stable kernels. Obviously
> > if it turns out that someone actually uses cmtp and/or capi, we
> > should not remove it.
> >
> Yes, I think this should be feasible.
>
> Regards
>   butt3rflyh4ck.
>
>
> --
> Active Defense Lab of Venustech



-- 
Active Defense Lab of Venustech

View attachment "0001-isdn-cpai-check-ctr-cnr-to-avoid-array-index-out-of-.patch" of type "text/x-patch" (2214 bytes)