linux-kernel - Re: usb/storage/uas: slab-out-of-bounds in uas

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Message-ID: <CAAeHK+yVXYJrVKW++kE+cXp=TMoDRCzPVd7G1X4YCueMbJF4HA@mail.gmail.com>
Date:   Thu, 21 Sep 2017 18:24:19 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Oliver Neukum <oneukum@...e.com>,
        Alan Stern <stern@...land.harvard.edu>,
        USB list <linux-usb@...r.kernel.org>,
        linux-scsi@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/storage/uas: slab-out-of-bounds in uas_probe

On Thu, Sep 21, 2017 at 6:10 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Thu, Sep 21, 2017 at 05:39:05PM +0200, Andrey Konovalov wrote:
>> Hi!
>>
>> I've got the following report while fuzzing the kernel with syzkaller.
>>
>> On commit ebb2c2437d8008d46796902ff390653822af6cc4 (Sep 18).
>>
>> The issue occurs when we iterate over interface altsettings, but I
>> don't see the driver doing anything wrong. I might be missing
>> something, or this might be an issue in USB core altsettings parsing.
>
>
> Any chance you happen to have the descriptors that you were feeding into
> the kernel at this crash?  That might help in figuring out what "went
> wrong".

Here's the data that I feed into dummy_udc:

00 00 00 00 09 02 12 00 01 34 05 80 07 09 04 6e
09 00 08 06 62 00 12 01 05 00 cb f7 71 83 04 00
05 00 ab f6 07 81 08 01

Also attaching a C reproducer (requires dummy_hcd and gadgetfs) and my .config.

>
> thanks,
>
> greg k-h

View attachment "uas_is_interface-oob-poc.c" of type "text/x-csrc" (7719 bytes)

Download attachment ".config" of type "application/octet-stream" (142420 bytes)