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

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Message-ID: <20151014153522.GC8218@pd.tnic>
Date:	Wed, 14 Oct 2015 17:35:22 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	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>
Subject: Re: [PATCH v2] x86/mm: warn on W+x mappings

On Wed, Oct 14, 2015 at 08:30:48AM -0700, Andy Lutomirski wrote:
> Can we just unmap these things until someone tries to do an EFI call,
> and then unmap them again after the call returns?  We already switch
> pgds for EFI IIRC.

hpa did mention an EFI-aware page fault handler at the time. I guess we
could do that too...

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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