linux-kernel - Re: [PATCH 2/3] binfmt_elf: Verify signature of signed elf binary

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Message-ID: <20130117152141.GB12165@redhat.com>
Date:	Thu, 17 Jan 2013 10:21:41 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, pjones@...hat.com, hpa@...or.com,
	dhowells@...hat.com, jwboyer@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 2/3] binfmt_elf: Verify signature of signed elf binary

On Thu, Jan 17, 2013 at 05:06:09PM +0200, Kasatkin, Dmitry wrote:

[..]
> One important thing to mention.
> Protecting ELF-only does not help too much in protecting the system.
> There are plenty of init, upstart and systemd scripts which must be
> verified as well. IMA does it.

Actually that would be a different requirement altogether. I am not
trying to verify all the processes started by root. I am just trying
to sign and verify signature of select user process and if signature
are verified, kernel grants those processes extra capability and allow
calling sys_kexec() when secureboot is enabled.

So for my use case, I don't care if there are so many other unsigned
processes running in the system.

Thanks
Vivek
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