linux-kernel - Re: usb/input/gtco: slab-out-of-bounds in parse_hid_report

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20171024053005.gleghx4szbdfoj63@dtor-ws>
Date:   Mon, 23 Oct 2017 22:30:05 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/input/gtco: slab-out-of-bounds in parse_hid_report_descriptor

On Mon, Oct 23, 2017 at 01:24:23PM +0200, Andrey Konovalov wrote:
> Hi!
> 
> I've got the following report while fuzzing the kernel with syzkaller.
> 
> On commit 3e0cc09a3a2c40ec1ffb6b4e12da86e98feccb11 (4.14-rc5+).
> 
> parse_hid_report_descriptor() has a while (i < length) loop, which
> only guarantees that there's at least 1 byte in the buffer, but the
> loop body can read multiple bytes which causes out-of-bounds access.

Ugh, this whole driver should be moved over to HID, but I am not sure
who has hardware to test... I just sent a patch plugging this hole.

Thanks for the report.

-- 
Dmitry