linux-kernel - Re: [PATCH 1/3] IMA: move read/write counters into struct inode

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Message-ID: <20101020133638.GA19804@ZenIV.linux.org.uk>
Date:	Wed, 20 Oct 2010 14:36:38 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	John Stoffel <john@...ffel.org>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	Mimi Zohar <zohar@...ibm.com>, warthog9@...nel.org,
	david@...morbit.com, jmorris@...ei.org, kyle@...artin.ca,
	hpa@...or.com, akpm@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 1/3] IMA: move read/write counters into struct inode

On Wed, Oct 20, 2010 at 09:10:27AM -0400, John Stoffel wrote:

> Does this mean I can't replace /bin/sh on a running system using IMA
> at all, even if just one process has it opened and is running?  So how
> the hell am I supposed to do live upgrades on a system?  

rename(2).  Prohibition against write(2) to binary being executed is
*old*.  Try to do the following:
cp /bin/sh /tmp
/tmp/sh &
cat /bin/ls >/tmp/sh
and you'll get
sh: /tmp/sh: Text file busy

That has nothing to do with IMA...
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