linux-kernel - Re: [Xen-devel] [PATCH v3 00/11] xen: Initial kexec/kdump implementation

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Message-ID: <50F080C6.5070206@zytor.com>
Date:	Fri, 11 Jan 2013 13:14:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Jan Beulich <JBeulich@...e.com>,
	"maxim.uvarov@...cle.com" <maxim.uvarov@...cle.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	David Howells <dhowells@...hat.com>
Subject: Re: [Xen-devel] [PATCH v3 00/11] xen: Initial kexec/kdump implementation

On 01/11/2013 01:08 PM, Vivek Goyal wrote:
>>
>> A signed /sbin/kexec would realistically have to be statically linked,
>> at least in the short term; otherwise the libraries and ld.so would need
>> verification as well.
>
> Yes. That's the expectation. Sign only statically linked exeutables which
> don't do any of dlopen() stuff either.
>
> In fact in the patch, I fail the exec() if signed executable has
> interpreter.
>

As I said, though (and possibly not for kexec, that depends): in the 
long term we probably want a way to be able to sign all kinds binaries 
in the system.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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