From: David Safford <safford@watson.ibm.com>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: James Morris <jmorris@namei.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Greg KH <greg@kroah.com>,
Dmitry Kasatkin <dmitry.kasatkin@nokia.com>,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [PATCH v5 00/21] EVM
Date: Fri, 20 May 2011 09:06:11 -0400 [thread overview]
Message-ID: <1305896771.15245.11.camel@localhost.localdomain> (raw)
In-Reply-To: <1305853626.2528.50.camel@localhost.localdomain>
On Thu, 2011-05-19 at 21:07 -0400, Mimi Zohar wrote:
> On Fri, 2011-05-20 at 10:51 +1000, James Morris wrote:
> > On Wed, 18 May 2011, Mimi Zohar wrote:
> >
> > > > Once we have a better understanding of what the feature does and why it
> > > > does it and how it interfaces with the user, we can start looking at
> > > > the implementation.
> > >
> > > Much appreciated!
> >
> > What is the status of potential users of the feature?
> >
> > I recall that MeeGo were planning to use EVM, but they've since changed
> > their security plans. Do they still plan to use it? Are any other users
> > committing to use EVM?
> >
> > Also -- this was raised some time back, but I can't find the discussion --
> > what does IMA/EVM provide over disk encryption as a protection against
> > offline attacks?
> >
> > - James
>
> Dave Safford's whitepaper discusses this.
> http://downloads.sf.net/project/linux-ima/linux-ima/Integrity_overview.pdf
>
> Mimi
The short answer is that encryption provides confidentiality, but does
not provide integrity, authenticity, or immutability.
The easiest way to think about it is to consider a one time pad, which
provides perfect confidentiality, but is trivially bit-twiddled. Yes,
AES is better in this respect, and encrypted file systems can combine
integrity (as long as you encrypt-then-authenticate), but usually they
don't.
If you want policy driven integrity, authenticity, and immutability,
(and we have two IBM customers wanting them this year), then you want
the combination IMA, IMA-Appraisal, EVM, and Dmitry's digital signature
extensions.
dave
next prev parent reply other threads:[~2011-05-20 13:06 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-16 14:44 [PATCH v5 00/21] EVM Mimi Zohar
2011-05-16 14:44 ` [PATCH v5 01/21] integrity: move ima inode integrity data management Mimi Zohar
2011-05-19 2:06 ` Serge E. Hallyn
2011-05-19 22:45 ` Mimi Zohar
2011-05-16 14:44 ` [PATCH v5 02/21] xattr: define vfs_getxattr_alloc and vfs_xattr_cmp Mimi Zohar
2011-05-19 2:11 ` Serge E. Hallyn
2011-05-16 14:44 ` [PATCH v5 03/21] evm: re-release Mimi Zohar
2011-05-19 6:05 ` Serge E. Hallyn
2011-05-19 22:49 ` Mimi Zohar
2011-05-20 11:12 ` Harald Hoyer
2011-05-20 11:21 ` Mimi Zohar
2011-05-19 21:37 ` Serge E. Hallyn
2011-05-20 12:29 ` Mimi Zohar
2011-05-20 13:43 ` Serge E. Hallyn
2011-05-16 14:44 ` [PATCH v5 04/21] evm: add support for different security.evm data types Mimi Zohar
2011-05-16 14:44 ` [PATCH v5 05/21] ima: move ima_file_free before releasing the file Mimi Zohar
2011-05-19 22:06 ` Serge E. Hallyn
2011-05-20 0:55 ` Mimi Zohar
2011-05-20 13:40 ` Serge E. Hallyn
2011-05-20 14:34 ` Mimi Zohar
2011-05-20 15:25 ` Serge E. Hallyn
2011-05-16 14:45 ` [PATCH v5 06/21] security: imbed evm calls in security hooks Mimi Zohar
2011-05-19 22:13 ` Serge E. Hallyn
2011-05-16 14:45 ` [PATCH v5 07/21] evm: evm_inode_post_removexattr Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 08/21] evm: imbed evm_inode_post_setattr Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 09/21] evm: evm_inode_post_init Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 10/21] fs: add evm_inode_post_init calls Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 11/21] evm: crypto hash replaced by shash Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 12/21] evm: add evm_inode_post_init call in btrfs Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 13/21] evm: add evm_inode_post_init call in gfs2 Mimi Zohar
2011-05-16 15:30 ` Steven Whitehouse
2011-05-16 15:50 ` Mimi Zohar
2011-05-16 16:14 ` Steven Whitehouse
2011-05-16 16:35 ` Mimi Zohar
2011-05-16 17:50 ` Mimi Zohar
2011-05-16 17:57 ` Steven Whitehouse
2011-05-16 18:20 ` Mimi Zohar
2011-05-16 18:23 ` Casey Schaufler
2011-05-16 18:48 ` Mimi Zohar
2011-05-16 19:25 ` Casey Schaufler
2011-05-19 0:55 ` Mimi Zohar
2011-05-19 9:25 ` Steven Whitehouse
2011-05-16 14:45 ` [PATCH v5 14/21] evm: add evm_inode_post_init call in jffs2 Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 15/21] evm: add evm_inode_post_init call in jfs Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 16/21] evm: add evm_inode_post_init call in xfs Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 17/21] evm: additional parameter to pass integrity cache entry 'iint' Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 18/21] evm: evm_verify_hmac must not return INTEGRITY_UNKNOWN Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 19/21] evm: replace hmac_status with evm_status Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 20/21] evm: permit only valid security.evm xattrs to be updated Mimi Zohar
2011-05-16 14:45 ` [PATCH v5 21/21] evm: add evm_inode_setattr to prevent updating an invalid security.evm Mimi Zohar
2011-05-19 0:25 ` [PATCH v5 00/21] EVM Andrew Morton
2011-05-19 1:51 ` Mimi Zohar
2011-05-20 0:51 ` James Morris
2011-05-20 1:07 ` Mimi Zohar
2011-05-20 13:06 ` David Safford [this message]
2011-05-20 14:13 ` Casey Schaufler
2011-05-26 6:08 ` Pavel Machek
2011-05-26 16:34 ` Casey Schaufler
2011-05-26 18:11 ` David Safford
2011-05-26 18:38 ` Pavel Machek
2011-05-26 19:30 ` Casey Schaufler
2011-05-26 20:02 ` Pavel Machek
2011-05-26 20:32 ` Casey Schaufler
2011-05-26 19:49 ` Mimi Zohar
2011-05-26 20:17 ` Pavel Machek
2011-05-27 17:45 ` David Safford
2011-05-29 6:58 ` Pavel Machek
2011-05-31 12:05 ` Mimi Zohar
2011-05-31 13:40 ` Valdis.Kletnieks
2011-06-01 22:11 ` Dmitry Kasatkin
2011-05-20 18:50 ` Serge E. Hallyn
2011-05-23 22:09 ` Mimi Zohar
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