linux-kernel - Re: [PATCH v2] x86/mm: warn on W+x mappings

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Message-ID: <1444959919.28005.26.camel@ranerica-desk01>
Date:	Thu, 15 Oct 2015 18:45:19 -0700
From:	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Stephen Smalley <sds@...ho.nsa.gov>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andy Lutomirski <luto@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>, luv@...ts.01.org
Subject: Re: [PATCH v2] x86/mm: warn on W+x mappings

On Thu, 2015-10-15 at 12:33 +0200, Borislav Petkov wrote:
> Yeah, that's actually a good idea. Why not upstream it for the wider
> audience so that people can actually start reporting b0rked UEFIs?
> With
> a big and nice FW_BUG splat in there...

We attempted to upstream in the past but later I discovered that my
implementation in particular is causing warnings due to SMP. Also, I
need to implement an alternative or extension to the current
efi_map_region, which have the __init qualifier. This is because
mappings might happen after the __inits have been discarded. I have this
work currently in my scope.

Thanks and BR,
Ricardo

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