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

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Message-ID: <20150306081334.GA3514@pd.tnic>
Date:	Fri, 6 Mar 2015 09:13:35 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Kweh Hock Leong <hock.leong.kweh@...el.com>,
	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>,
	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 Thu, Mar 05, 2015 at 03:08:42PM -0800, Andy Lutomirski wrote:
> No.  Only root should be able to load capsules, but even root may not
> be able to write to /lib.

So basically what we want to do is:

# cat /any/path/to/efi/capsule/accessible/to/root/efi_capsule.img > /sys/firmware/efi/update

Now it can't get any simpler than that and you get error codes too by
failing the cat if the update fails.

Mind you, I'm using '#' and not '$' as a shell prompt :-)

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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