linux-kernel - Re: [PATCH] posix-timer: don't call idr

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Message-ID: <CAOS58YM77VdO9EoH-5LKZ0NBR0d41GE900goqktU29Oi5=Ov8g@mail.gmail.com>
Date:	Wed, 20 Feb 2013 14:12:37 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] posix-timer: don't call idr_find() w/ negative ID

On Wed, Feb 20, 2013 at 2:10 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
> I do think that if you have to resort to using something like that there's
> something terribly wrong with the code somewhere else, and that other thing
> should be fixed first.
>
> Maybe digging into the timers code and seeing why this is needed there will
> prove me wrong...

The problem is that userland can feed us any timer_t which makes it
necessary to properly sanitize the value before using it.

Thanks.

-- 
tejun
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