linux-kernel - Re: Re: [PATCH v2 3/3] efi: Capsule update with user helper interface

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Date:	Tue, 3 Mar 2015 13:56:30 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Ong Boon Leong <boon.leong.ong@...el.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ming Lei <ming.lei@...onical.com>
Subject: Re: Re: [PATCH v2 3/3] efi: Capsule update with user helper interface

On Mar 3, 2015 12:51 PM, "Borislav Petkov" <bp@...en8.de> wrote:
>
> On Tue, Mar 03, 2015 at 12:37:54PM -0800, Andy Lutomirski wrote:
> > The user *should not* be required to have write access to anything in
> > /lib to install a UEFI capsule that they download from their
> > motherboard vendor's website.  /lib belongs to the distro, and UEFI
> > capsules do not belong to the distro.  In this regard, UEFI capsules
> > are completely unlike your wireless card firmware, your cpu microcode,
> > etc.
>
> Oh oh but but, if an UEFI capsule can brick the system, a normal user
> would be able to brick that system then. I think we should forbid that.

Absolutely.  That's why I said

# uefi-load-capsule

and not

$ uefi-load-capsule

:)

>
> I agree with the rest of your note that a simple
>
> cat <fw_blob> > /sys/...
>
> should be enough.
>
> --
> Regards/Gruss,
>     Boris.
>
> ECO tip #101: Trim your mails when you reply.
> --
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