From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Satyam Sharma <satyam@infradead.org>,
Jan Engelhardt <jengelh@computergmbh.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: NFS4 authentification / fsuid
Date: Fri, 07 Sep 2007 01:21:50 +0200 [thread overview]
Message-ID: <1189120910.6672.30.camel@heimdal.trondhjem.org> (raw)
In-Reply-To: <20070906151118.GB28565@fieldses.org>
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....
next prev parent reply other threads:[~2007-09-06 23:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-30 14:12 Jan Engelhardt
2007-08-30 14:29 ` Trond Myklebust
2007-08-30 14:32 ` Trond Myklebust
2007-08-30 14:42 ` Jan Engelhardt
2007-08-30 15:04 ` Trond Myklebust
2007-08-30 21:44 ` J. Bruce Fields
2007-09-06 8:14 ` Satyam Sharma
2007-09-06 8:29 ` Satyam Sharma
2007-09-06 15:11 ` J. Bruce Fields
2007-09-06 23:21 ` Trond Myklebust [this message]
2007-09-06 23:32 ` Trond Myklebust
2007-09-07 15:34 ` J. Bruce Fields
2007-09-18 23:27 ` Satyam Sharma
2007-09-18 23:12 ` Satyam Sharma
2007-09-06 15:06 ` J. Bruce Fields
2007-09-06 23:30 ` Kyle Moffett
2007-09-06 23:35 ` Trond Myklebust
2007-09-07 0:56 ` Kyle Moffett
2007-09-07 5:14 ` Trond Myklebust
2007-09-07 5:47 ` Kyle Moffett
2007-09-07 6:37 ` Bernd Eckenfels
2007-09-18 23:48 ` Satyam Sharma
2007-09-18 23:44 ` Satyam Sharma
2007-09-19 5:16 ` Kyle Moffett
2007-09-19 12:16 ` Satyam Sharma
2007-09-19 13:49 ` Kyle Moffett
2007-09-19 14:12 ` Satyam Sharma
2007-09-19 15:01 ` J. Bruce Fields
2007-09-20 7:03 ` Satyam Sharma
2007-09-19 16:38 ` Valdis.Kletnieks
2007-09-20 7:15 ` Satyam Sharma
2007-08-30 15:12 ` J. Bruce Fields
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