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]

Message-ID: <20151120083348.GB321@x4>
Date:	Fri, 20 Nov 2015 09:33:48 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Borislav Petkov <bp@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: x86/microcode update on systems without INITRD

On 2015.11.20 at 09:27 +0100, Borislav Petkov wrote:
> 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.

Well, BLK_DEV_INITRD is not set in my config and it works just fine...

-- 
Markus
--
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/