linux-kernel - Re: [tip:x86/mm] x86/mm: Warn on W^X mappings

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Date:	Tue, 6 Oct 2015 16:49:37 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	bp@...en8.de, luto@...capital.net, peterz@...radead.org,
	sds@...ho.nsa.gov, keescook@...omium.org,
	torvalds@...ux-foundation.org, efault@....de,
	linux-kernel@...r.kernel.org, hpa@...or.com, tglx@...utronix.de,
	brgerst@...il.com, dvlasenk@...hat.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86/mm: Warn on W^X mappings


* Arjan van de Ven <arjan@...ux.intel.com> wrote:

> On 10/6/2015 2:54 AM, tip-bot for Stephen Smalley wrote:
> >Commit-ID:  e1a58320a38dfa72be48a0f1a3a92273663ba6db
> >Gitweb:     http://git.kernel.org/tip/e1a58320a38dfa72be48a0f1a3a92273663ba6db
> >Author:     Stephen Smalley <sds@...ho.nsa.gov>
> >AuthorDate: Mon, 5 Oct 2015 12:55:20 -0400
> >Committer:  Ingo Molnar <mingo@...nel.org>
> >CommitDate: Tue, 6 Oct 2015 11:11:48 +0200
> >
> >x86/mm: Warn on W^X mappings
> >
> >Warn on any residual W+X mappings after setting NX
> >if DEBUG_WX is enabled.  Introduce a separate
> >X86_PTDUMP_CORE config that enables the code for
> >dumping the page tables without enabling the debugfs
> >interface, so that DEBUG_WX can be enabled without
> >exposing the debugfs interface.  Switch EFI_PGT_DUMP
> >to using X86_PTDUMP_CORE so that it also does not require
> >enabling the debugfs interface.
> 
> I like it, so Acked-by: Arjan van de Ven <arjan@...ux.intel.com>
> 
> I also have/had an old userland script to do similar checks but using the 
> debugfs interface... ... would that be useful to have somewhere more central?
> 
> http://git.fenrus.org/tmp/i386-check-pagetables.pl

Sure, I think it could be put into tools/testing/selftests/x86/.

Thanks,

	Ingo
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