linux-kernel - Re: [PATCH] Set bounds on what /proc/self/make-it-fail accepts.

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Message-ID: <alpine.DEB.2.02.1402191406140.31921@chino.kir.corp.google.com>
Date:	Wed, 19 Feb 2014 14:07:50 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Akinobu Mita <akinobu.mita@...il.com>
Subject: Re: [PATCH] Set bounds on what /proc/self/make-it-fail accepts.

On Wed, 19 Feb 2014, Andrew Morton wrote:

> If we're touching the task_struct we could make it a bool.
> 
> Or just a single bit(field).  task_struct already has a bunch of
> bitfields in it (strangely, they aren't contiguous).  But some locking
> would be needed if tasks-other-than-current can modify the bit.
> 

Or store to any adjacent bit in the word.  I think the simplest solution 
is to use kstrtoint() and test for val == !!val since, as we all know, 
{simple,strict}_strto* is deprecated per checkpatch :)
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