linux-kernel - Re: [PATCH] HID: Bluetooth: hidp: buffer overflow in hidp_process

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Message-ID: <20180801163703.GA6994@kroah.com>
Date:   Wed, 1 Aug 2018 18:37:03 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mark Salyzyn <salyzyn@...roid.com>
Cc:     linux-kernel@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        security@...nel.org, kernel-team@...roid.com,
        Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH] HID: Bluetooth: hidp: buffer overflow in
 hidp_process_report

On Tue, Jul 31, 2018 at 03:02:13PM -0700, Mark Salyzyn wrote:
> CVE-2018-9363
> 
> The buffer length is unsigned at all layers, but gets cast to int and
> checked in hidp_process_report and can lead to a buffer overflow.
> Switch len parameter to unsigned int to resolve issue.
> 
> This affects 3.18 and newer kernels.
> 
> Signed-off-by: Mark Salyzyn <salyzyn@...roid.com>
> Fixes: a4b1b5877b514b276f0f31efe02388a9c2836728 ("HID: Bluetooth: hidp: make sure input buffers are big enough")
> Cc: Marcel Holtmann <marcel@...tmann.org>
> Cc: Johan Hedberg <johan.hedberg@...il.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> Cc: linux-bluetooth@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: security@...nel.org
> Cc: kernel-team@...roid.com

Nit, you only need to bother security@ if you do not have a fix and need
to figure out one.

Also, you forgot to cc: stable@...r.kernel.org to be included in older
kernel releases :(

thanks,

greg k-h