linux-kernel - Re: [PATCH 1/2] vsprintf/sysctl: Bugfix, neaten and document %pK usages

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Message-ID: <1381469910.14017.45.camel@joe-AO722>
Date:	Thu, 10 Oct 2013 22:38:30 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ryan Mallon <rmallon@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	Rob Landley <rob@...dley.net>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] vsprintf/sysctl: Bugfix, neaten and document %pK
 usages

On Fri, 2013-10-11 at 16:31 +1100, Ryan Mallon wrote:
> On 11/10/13 16:25, Joe Perches wrote:
> > Printing kernel pointers via %pK has a minor defect when
> > kptr_restrict is set to 2:  the pointer may be emitted
> > as "pK-error" instead of all 0's when in an interrupt.
> 
> NAK. This is not a defect, as I explained earlier. It is really a defect
> that it _doesn't_ print 'pK-error' in all cases. 'pK-error' is for
> finding kernel bugs.

Not my understanding.

There is no bug to find when emitting a pointer via %pK.

The only issue is that has_capability_noaudit can not
be called from an interrupt.


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