linux-kernel - Re: [PATCH v3] ARM: mm: report both sections from PMD

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Date:	Fri, 14 Feb 2014 19:23:22 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kees Cook <keescook@...omium.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Steve Capper <steve.capper@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: mm: report both sections from PMD

On Fri, Feb 14, 2014 at 11:13:53AM -0800, Kees Cook wrote:
> On Fri, Feb 14, 2014 at 2:17 AM, Catalin Marinas
> <catalin.marinas@....com> wrote:
> > On Thu, Feb 13, 2014 at 07:52:30PM +0000, Kees Cook wrote:
> >> On 2-level page table systems, the PMD has 2 section entries. Report
> >> these, otherwise ARM_PTDUMP will miss reporting permission changes on
> >> odd section boundaries.
> >>
> >> Signed-off-by: Kees Cook <keescook@...omium.org>
> >
> > Acked-by: Catalin Marinas <catalin.marinas@....com>
> 
> On Fri, Feb 14, 2014 at 9:05 AM, Steve Capper <steve.capper@...aro.org> wrote:
> > Tested-by: Steve Capper <steve.capper@...aro.org>
> 
> Thanks to both of you! If you have a moment can you check this other
> patch which has additional fixes for the dump code?
> 
> https://lkml.org/lkml/2014/2/12/662

It's not that simple, because APX in section descriptors doesn't exist
on pre-v6 ARMs.  This needs to be conditional upon the CPU arch.

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