kernel-hardening - Re: [PATCH V11 2/5] vsprintf: refactor %pK code out of pointer()

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Message-ID: <20171129042746.GF15500@eros>
Date: Wed, 29 Nov 2017 15:27:46 +1100
From: "Tobin C. Harding" <me@...in.cc>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: kernel-hardening@...ts.openwall.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
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Subject: Re: [PATCH V11 2/5] vsprintf: refactor %pK code out of pointer()

On Tue, Nov 28, 2017 at 09:39:57PM -0500, Steven Rostedt wrote:
> On Wed, 29 Nov 2017 13:05:02 +1100
> "Tobin C. Harding" <me@...in.cc> wrote:
> 
> > +		/*
> > +		 * kptr_restrict==1 cannot be used in IRQ context
> > +		 * because its test for CAP_SYSLOG would be meaningless.
> > +		 */
> > +		if (in_irq() || in_serving_softirq() || in_nmi())
> 
> This could be replaced with:
> 
> 		if (!in_task())
> 
> Which is actually more efficient.

thanks for the comment Steve. At this late stage in the game do you mind
if I don't include this change in this set. The code line in question is
only in the series because of refactoring. I'm comfortable arguing that
improving efficiency is out of scope ;)

thanks,
Tobin.

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