linux-kernel - Re: [PATCH -v2 0/4] EFI 1:1 mapping

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130619173721.GI28300@pd.tnic>
Date:	Wed, 19 Jun 2013 19:37:21 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linux EFI <linux-efi@...r.kernel.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -v2 0/4] EFI 1:1 mapping

On Wed, Jun 19, 2013 at 12:25:42PM -0500, H. Peter Anvin wrote:
> On 06/19/2013 08:02 AM, Borislav Petkov wrote:
> > 
> > And yet there are the Macs which reportedly cannot stomach this.
> > 
> No, the reports are that if you use the 1:1 map as the primary address
> on Macs the drivers fail... not that you can't have a 1:1 map.

That's what I meant: ... cannot stomach when the 1:1 map is shoved down
SetVirtualAddressMap.

The thing is, if we want to have both the 1:1 map and the high map
during an EFI runtime call, we would need to *always* switch the
pagetable for an EFI runtime call and establish both mappings in
->trampoline_pgd beforehand.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/