linux-kernel - Re: [PATCH 4.19 124/125] HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl

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Message-ID: <20200901191209.GB5295@duo.ucw.cz>
Date:   Tue, 1 Sep 2020 21:12:09 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        syzbot+34ee1b45d88571c2fa8b@...kaller.appspotmail.com,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Peilin Ye <yepeilin.cs@...il.com>,
        Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH 4.19 124/125] HID: hiddev: Fix slab-out-of-bounds write
 in hiddev_ioctl_usage()

Hi!

> commit 25a097f5204675550afb879ee18238ca917cba7a upstream.
> 
> `uref->usage_index` is not always being properly checked, causing
> hiddev_ioctl_usage() to go out of bounds under some cases. Fix it.

Well, the code is quite confusig, but:

a) does HIDIOCGCOLLECTIONINDEX need same checking?

b) should we check this using some kind of _nospec() variant to
prevent speculation attacks?

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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