linux-kernel - Re: [PATCH 4/4] efi: Make efi virtual runtime map passing more robust

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Message-ID: <20140113131737.GB1900@darkstar.nay.redhat.com>
Date:	Mon, 13 Jan 2014 21:17:37 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Linux EFI <linux-efi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>, Toshi Kani <toshi.kani@...com>
Subject: Re: [PATCH 4/4] efi: Make efi virtual runtime map passing more robust

On Mon, Jan 13, 2014 at 11:27:34AM +0100, Borislav Petkov wrote:
> On Mon, Jan 13, 2014 at 01:40:39PM +0800, Dave Young wrote:
> > Adding a safeguard check for desc_size is better though currently it's
> > impossible for the desc_size > PAGE_SIZE?
> 
> Huh, what?
> 
> sizeof(efi_memory_desc_t) is only 40 bytes AFAICT.

I know this is nearly impossible, but is there possible for some corrupted
desc_size value or firmware bug? who knows...

Thanks
Dave
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