linux-kernel - Re: RFC: default CONFIG_EFI

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: <520A7B48.3020304@zytor.com>
Date:	Tue, 13 Aug 2013 11:30:32 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: RFC: default CONFIG_EFI_STUB=y

On 08/09/2013 08:38 AM, H. Peter Anvin wrote:
> On 08/09/2013 08:32 AM, James Bottomley wrote:
>> On Fri, 2013-08-09 at 08:23 -0700, H. Peter Anvin wrote:
>>> I would like to change the defaults for CONFIG_EFI and CONFIG_EFI_STUB
>>> to y.  There is little reason to omit this since EFI now is a
>>> significant percentage of all systems.
>>
>> You didn't actually attach the patch, but I presume this is for 64 bit
>> compiles on x86 only?  We still have significant problems getting 64 bit
>> EFI to interact with 32 bit kernels, so I don't believe we should enable
>> CONFIG_EFI globally for all of x86.
>>
> 
> Well, it doesn't *solve* the problem with cross-mode, but it should work
> as-is for EFI32->32-bit kernel and EFI64->64-bit kernel.  For the
> cross-mode kernels they will simply not do anything.
> 
> Either way, nothing bad should come from it.  The worst thing that will
> happen is that the kernel says "I don't have any EFI that I recognize."
> 
> Cross-mode support will always require a secondary bootloader (since as
> far as I know there is no concept of "fat binaries" for EFI), but Matt
> Fleming is working on genuine cross-mode support for both the boot stub
> and (eventually) run time support.
> 

James, does this address your concerns?

	-hpa


--
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/