linux-kernel - Re: [PATCH] HID: fix out of bound access in extract and implement

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Message-ID: <alpine.LNX.2.00.1601191414290.21446@cbobk.fhfr.pm>
Date:	Tue, 19 Jan 2016 14:14:45 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Dmitry Torokhov <dtor@...omium.org>
cc:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: fix out of bound access in extract and implement

On Mon, 18 Jan 2016, Dmitry Torokhov wrote:

> extract() and implement() access buffer containing reports in 64-bit
> chunks, but there is no guarantee that buffers are padded to 64 bit
> boundary. In fact, KASAN has caught such OOB access with i2c-hid and
> Synaptics touch controller.
> 
> Instead of trying to hunt all parties that allocate buffers and make
> sure they are padded, let's switch extract() and implement() to byte
> access. It is a bit slower, bit we are not dealing with super fast
> devices here.
> 
> Also let's fix link to the HID spec while we are at it.
> 
> Signed-off-by: Dmitry Torokhov <dtor@...omium.org>

Good catch, applied to for-4.5/upstream-fixes. Thanks,

-- 
Jiri Kosina
SUSE Labs