linux-kernel - Re: [PATCH 06/11] IMA: use i_writecount rather than a private counter

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Message-ID: <4CC75155.4060807@zytor.com>
Date:	Tue, 26 Oct 2010 15:08:21 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	John Stoffel <john@...ffel.org>
CC:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org, zohar@...ibm.com,
	warthog9@...nel.org, david@...morbit.com, jmorris@...ei.org,
	kyle@...artin.ca, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, mingo@...e.hu,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH 06/11] IMA: use i_writecount rather than a private counter

On 10/26/2010 06:53 AM, John Stoffel wrote:
> 
> No.  What I was trying to get at, and probably poorly, was the comment
> you made about having to keep the IMA data structures around, even if
> IMA has been disabled, so that you could continue to claim integrity
> if IMA was re-enabled.
> 
> So my question is really about the following situation:
> 
> 1.  System boots up, IMA is enabled.
> 2.  SysAdmin notices and turns it off.
>     - does the IMA overhead (not the per-inode 4 bytes) go away?
>     - do the various in memory data structures get freed?
>     - does the pointer in the inode get null'ed?
> 

I think it's reasonable to require a reboot in this case.

	-hpa
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