linux-kernel - Re: [PATCH 2/4] IMA: maintain i

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Message-ID: <6166.1288361618@localhost>
Date:	Fri, 29 Oct 2010 10:13:38 -0400
From:	Valdis.Kletnieks@...edu
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	warthog9@...nel.org, david@...morbit.com, jmorris@...ei.org,
	kyle@...artin.ca, hpa@...or.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, mingo@...e.hu, eparis@...hat.com,
	viro@...iv.linux.org.uk, Matthew Wilcox <matthew@....cx>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 2/4] IMA: maintain i_readcount in the VFS layer

On Thu, 28 Oct 2010 18:02:03 EDT, Mimi Zohar said:
> ima_counts_get() updated the readcount and invalidated the PCR,
> as necessary. Only update the i_readcount in the VFS layer.
> Move the PCR invalidation checks to ima_file_check(), where it
> belongs.
> 
> Maintaining the i_readcount in the VFS layer, will allow other
> subsystems to use i_readcount.

Would a symmetric i_writecount be useful for anything?  If it existed,
could any code be simplified elsewhere?


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