linux-kernel - Re: [PATCHv2 1/3] x86, ptdump: Add section for EFI runtime services

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Date:	Tue, 28 Oct 2014 23:07:31 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Mathias Krause <minipli@...glemail.com>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	x86-ml <x86@...nel.org>, Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCHv2 1/3] x86, ptdump: Add section for EFI runtime services

On Tue, Oct 28, 2014 at 10:49:36PM +0100, Mathias Krause wrote:
> Sync only data or kernel code, too?

Data only should be enough.

> Really, I'd just map the EFI RT service virtual mappings "somewhere"
> but at pgd[511] and have pgd[511] initially set up as
> init_level4_pgt[511]. Then, thing should "just work"(TM).

Nah, nothing with EFI just works :-)

> If you fear the EFI code might do harm to the kernel code/data, then
> you've lost anyway. Nothing will prevent the EFI code from doing nasty
> things -- like setting up its own mappings to tamper with the kernel's
> memory.

Sure, nothing would surprise me anymore. However, I'd prefer to not be
an enabler. :)

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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