linux-kernel - Re: x86/microcode update on systems without INITRD

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]

Date:	Fri, 20 Nov 2015 09:27:16 +0100
From:	Borislav Petkov <bp@...e.de>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: x86/microcode update on systems without INITRD

On Fri, Nov 20, 2015 at 08:19:20AM +0100, Markus Trippelsdorf wrote:
> On 2015.11.19 at 23:58 +0100, Borislav Petkov wrote:
> > On Thu, Nov 19, 2015 at 10:55:43PM +0100, Borislav Petkov wrote:
> > > On Thu, Nov 19, 2015 at 10:43:01PM +0100, Markus Trippelsdorf wrote:
> > > > It looks like the ability to update x86/microcode without using an
> > > > initrd was removed this merge window.
> > > 
> > > Whoops, that shouldnt've happened. Will debug it tomorrow and provide a
> > > fix.
> > 
> > Anyway, the hunk below seems to work in my guest here, I'll run it
> > on the rest of the boxes tomorrow. In case you want to give it a try
> > before:
> 
> Your patch works fine. Thanks.

Thanks for testing.

> But of course it needs this additional patch, otherwise the microcode
> loader wouldn't build at all:
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index db3622f22b61..52c6964e24bd 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1126,7 +1126,6 @@ config MICROCODE
>  	bool "CPU microcode loading support"
>  	default y
>  	depends on CPU_SUP_AMD || CPU_SUP_INTEL
> -	depends on BLK_DEV_INITRD
>  	select FW_LOADER
>  	---help---

That dependency is a must as the early loader needs the initrd support.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
-- 
--
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/