linux-kernel - Re: Should we automatically generate a module signing key at all?

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Message-ID: <24864.1432333288@warthog.procyon.org.uk>
Date:	Fri, 22 May 2015 23:21:28 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	dhowells@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	George Spelvin <linux@...izon.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	LSM List <linux-security-module@...r.kernel.org>,
	petkan@...-labs.com, "Theodore Ts'o" <tytso@....edu>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Subject: Re: Should we automatically generate a module signing key at all?

Andy Lutomirski <luto@...capital.net> wrote:

> > Since it's discarded at the end of boot, it could be padded significantly.
> 
> If you use the hash tree approach, the size of the thing in bzImage is
> constant.

Given that bzImage is usually compressed, a whole slew of contiguous zero
padding is also constant in size.

David
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