linux-kernel - Re: [PATCH 06/20] Input: atmel_mxt_ts - allow writing to object sysfs entry

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Message-ID: <20120320230353.5625540f@pyramind.ukuu.org.uk>
Date:	Tue, 20 Mar 2012 23:03:53 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Iiro Valkonen <iiro.valkonen@...el.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>
Subject: Re: [PATCH 06/20] Input: atmel_mxt_ts - allow writing to object
 sysfs entry

On Tue, 13 Mar 2012 20:04:09 +0800
Daniel Kurtz <djkurtz@...omium.org> wrote:

> Userspace can write a 24-bit value (encoded as a 6 character hex string)
> to the 'object' sysfs entry to modify a single byte of the object table.
> The hex string encodes a 3 bytes, in the following format:

How is this locked against other users and updates of these table data ?

I don't see how all the objects and their pointers and size are
guaranteedto always be valid in all the users you have ?

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