linux-kernel - Re: IMA: kernel reading files opened with O

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Message-ID: <CACE9dm8TW1+7bq6hJiOmoAw+w+ZD8Ma=Sf6a5ZM2HZ5X1Lcifw@mail.gmail.com>
Date:	Sat, 12 Jul 2014 01:22:04 +0300
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jeff Moyer <jmoyer@...hat.com>,
	Dmitry Kasatkin <d.kasatkin@...sung.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, Al Viro <viro@...iv.linux.org.uk>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: IMA: kernel reading files opened with O_DIRECT

On 11 July 2014 23:10, Pavel Machek <pavel@....cz> wrote:
> On Wed 2014-07-02 11:40:50, Christoph Hellwig wrote:
>> On Wed, Jul 02, 2014 at 11:55:41AM -0400, Jeff Moyer wrote:
>> > It's acceptable.
>>
>> It's not because it will then also affect other reads going on at the
>> same time.
>>
>> The whole concept of ima is just broken, and if you want to do these
>> sort of verification they need to happen inside the filesystem and not
>> above it.
>
> ...and doing it at filesystem layer would also permit verification of
> per-block (64KB? 1MB?) hashes.

Please design one single and the best universal filesystem which does it.

> Reading entire iso image when I run
> "file foo.iso" is anti-social..
>                                                                         Pavel

Please make the policy which does not make anti-social.

It is all about use-case.

- Dmitry

> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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