linux-kernel - Re: [PATCH] firmware: make sure paths remain relative

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Message-ID: <CAGXu5j+n7vPVAbx+=Dyd81FfCKQcM9HzHRQBg-JQoBOwu5fZVw@mail.gmail.com>
Date:	Mon, 17 Dec 2012 17:37:58 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] firmware: make sure paths remain relative

On Mon, Dec 17, 2012 at 5:30 PM, Ming Lei <ming.lei@...onical.com> wrote:
> On Sat, Dec 15, 2012 at 6:51 AM, Kees Cook <keescook@...omium.org> wrote:
>> Some devices have configurable firmware locations. If these configuration
>> mechanisms are exposed to unprivileged userspace, it may be possible to
>
> I an wondering how the unprivileged userspace can write the firmware sysfs
> to trigger loading firmware?

If a daemon were to, for example, make firmware selectable by the user
(which under certain situations is possible in Chrome OS), it seems
wasteful require these userspace tools/interfaces to each perform
filtering, so I figured it would be trivial to put in here instead to
avoid possible future vulnerabilities.

-Kees

-- 
Kees Cook
Chrome OS Security
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