linux-kernel - Re: [GIT PULL v4 0/6] EFI page table isolation

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Message-ID: <20151129081820.GA24006@gmail.com>
Date:	Sun, 29 Nov 2015 09:18:20 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Matt Fleming <matt@...eblueprint.co.uk>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H . Peter Anvin" <hpa@...or.com>, Toshi Kani <toshi.kani@...com>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...el.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: [GIT PULL v4 0/6] EFI page table isolation


* Matt Fleming <matt@...eblueprint.co.uk> wrote:

> Folks,
> 
> This patch series is a response to the report that the EFI region
> mappings trigger warnings when booting with CONFIG_DEBUG_WX enabled.
> They allocate a new page table structure and ensure that all the
> mappings we require during EFI runtime calls are only setup there.
> 
> It turns out that it still makes sense to share some page table
> entries with 'swapper_pg_dir', just not the entries where we need to
> allow security lax permissions. Sharing entries is useful for memory
> hotplug, for example.
> 
> When writing this series I discovered a number of bugs in the existing
> code that only became apparent when we stopped using 'trampoline_pgd'
> which already mapped a bunch of things for us. I've put those bug
> fixes at the start of the series.
> 
> Further testing would be very much appreciated as this is a
> notoriously funky area of the EFI code.

Ok, this series looks great to me - I've applied this to tip:x86/efi and will push 
it out to linux-next after it passes some local testing.

There should be time enough before v4.5 to figure out potential bugs.

Thanks,

	Ingo
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