linux-kernel - Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware

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Message-ID: <20150417143640.GB3671@codeblueprint.co.uk>
Date:	Fri, 17 Apr 2015 15:36:40 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
	Ming Lei <ming.lei@...onical.com>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	Peter Jones <pjones@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Roy Franz <roy.franz@...aro.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi
 firmware

On Fri, 17 Apr, at 03:49:24PM, Greg KH wrote:
> 
> Not really, the kernel namespace is what matters at that point in time.
> 
> And maybe it does matter, I haven't thought through all of the issues.
> But passing a path from userspace, to the kernel, to have the kernel
> turn around again and use that path is full of nasty consequences at
> times due to namespaces, let's avoid all of that please.

Oh crap. The namespace issue is a good point and not something I'd
thought of at all.

At this point, I think we've really run out of objections to Andy's
suggestion of implementing this as a misc device, right?

The concern I had about userspace tooling can partly be addressed by
including the source in tools/ in the kernel tree. So provided we do
that, I'm happy enough to see this implemented as a misc device because
the other options we've explored just haven't panned out.

Objections?

-- 
Matt Fleming, Intel Open Source Technology Center
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