linux-kernel - Re: NFS4 authentification / fsuid

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Message-Id: <1189120910.6672.30.camel@heimdal.trondhjem.org>
Date:	Fri, 07 Sep 2007 01:21:50 +0200
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Satyam Sharma <satyam@...radead.org>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: NFS4 authentification / fsuid

On Thu, 2007-09-06 at 11:11 -0400, J. Bruce Fields wrote:
> 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.

mount -t tmpfs none /my_tmpfs
cd /my_tmpfs
cp -a /bin bin
cp -p my_keylogging_pam_module.so lib
pivot_root . /old-root

to take another example....

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