linux-kernel - Re: [PATCH 07/13] kexec: Implementation of new syscall kexec_file

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Message-ID: <20140613075011.GA4751@pd.tnic>
Date:	Fri, 13 Jun 2014 09:50:11 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	WANG Chao <chaowang@...hat.com>, Dave Young <dyoung@...hat.com>,
	mjg59@...f.ucam.org, bhe@...hat.com, jkosina@...e.cz,
	greg@...ah.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com, hpa@...or.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 07/13] kexec: Implementation of new syscall
 kexec_file_load

On Mon, Jun 09, 2014 at 11:41:37AM -0400, Vivek Goyal wrote:
> IIUC, COMMAND_LINE_SIZE gives max limits of running kernel and it does
> not tell us anything about command line size supported by kernel being
> loaded.

Whatever you do, you do need a sane default because even querying the
boot protocol is not reliable as the to-be-loaded kernel's boot protocol
might be manipulated too, before signing (who knows what people do
in the wild).

So having a sane, unconditional fallback COMMAND_LINE_SIZE from the
first kernel is a must, methinks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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