linux-kernel - Re: [PATCH 10/18] efi: Enable secure boot lockdown automatically when enabled in firmware

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Message-ID: <20130825162618.GA20297@srcf.ucam.org>
Date:	Sun, 25 Aug 2013 17:26:19 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Pavel Machek <pavel@....cz>
Cc:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-crypto@...r.kernel.org,
	opensuse-kernel@...nsuse.org, David Howells <dhowells@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	Greg KH <gregkh@...uxfoundation.org>, JKosina@...e.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Gary Lin <GLin@...e.com>, Vivek Goyal <vgoyal@...hat.com>,
	Matthew Garrett <mjg@...hat.com>,
	"Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [PATCH 10/18] efi: Enable secure boot lockdown automatically
 when enabled in firmware

On Sun, Aug 25, 2013 at 06:22:43PM +0200, Pavel Machek wrote:
> On Thu 2013-08-22 19:01:49, Lee, Chun-Yi wrote:
> > From: Matthew Garrett <mjg@...hat.com>
> > 
> > The firmware has a set of flags that indicate whether secure boot is enabled
> > and enforcing. Use them to indicate whether the kernel should lock itself
> > down.  We also indicate the machine is in secure boot mode by adding the
> > EFI_SECURE_BOOT bit for use with efi_enabled.
> 
> > +	status = efi_call_phys5(sys_table->runtime->get_variable,
> > +				L"SecureBoot", &var_guid, NULL, &datasize, &sb);
> 
> What is this L"..." thing?

http://en.wikipedia.org/wiki/C_syntax#Wide_character_strings
-- 
Matthew Garrett | mjg59@...f.ucam.org
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