linux-kernel - Re: NFS4 authentification / fsuid

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Message-ID: <20070906151118.GB28565@fieldses.org>
Date:	Thu, 6 Sep 2007 11:11:18 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: NFS4 authentification / fsuid

On Thu, Sep 06, 2007 at 01:59:50PM +0530, Satyam Sharma wrote:
> Oh and btw, note that we're talking of the (lack of) security of a
> "running kernel" here -- because across reboots, there is /really/
> *absolutely* no such thing as "kernelspace security" because the superuser
> will simply switch the vmlinuz itself ...

Well, the machine could be booting from cdrom, and could live in a
locked machine room.  Or people with root on a virtual host don't
necessarily have the ability to replace the kernel for that host.

--b.
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