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From: Mimi Zohar <zohar@linux.ibm.com>
To: Dominik Brodowski <linux@dominikbrodowski.net>, hpa@zytor.com
Cc: Roberto Sassu <roberto.sassu@huawei.com>,
	viro@zeniv.linux.org.uk, linux-security-module@vger.kernel.org,
	linux-integrity@vger.kernel.org, initramfs@vger.kernel.org,
	linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, zohar@linux.vnet.ibm.com,
	silviu.vlasceanu@huawei.com, dmitry.kasatkin@huawei.com,
	takondra@cisco.com, kamensky@cisco.com, arnd@arndb.de,
	rob@landley.net, james.w.mcmechan@gmail.com
Subject: Re: [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk
Date: Sun, 12 May 2019 20:02:30 -0400
Message-ID: <1557705750.10635.264.camel@linux.ibm.com> (raw)
In-Reply-To: <20190512153105.GA25254@light.dominikbrodowski.net>

On Sun, 2019-05-12 at 17:31 +0200, Dominik Brodowski wrote:
> On Sun, May 12, 2019 at 08:52:47AM -0400, Mimi Zohar wrote:


> > It's too late.  The /init itself should be signed and verified.
> 
> Could you elaborate a bit more about the threat model, and why deferring
> this to the initramfs is too late?

The IMA policy defines a number of different methods of identifying
which files to measure, appraise, audit.[1]  Without xattrs, the
granularity of the policy rules is severely limited.  Without xattrs,
a filesystem is either in policy, or not.

With an IMA policy rule requiring rootfs (tmpfs) files to be verified,
then /init needs to be properly labeled, otherwise /init will fail to
execute.

Mimi

[1] Documentation/ABI/testing/ima_policy


  reply index

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-09 11:24 Roberto Sassu
2019-05-09 11:24 ` [PATCH v2 1/3] fs: add ksys_lsetxattr() wrapper Roberto Sassu
2019-05-10 21:28   ` Jann Horn
2019-05-09 11:24 ` [PATCH v2 2/3] initramfs: set extended attributes Roberto Sassu
2019-05-09 11:24 ` [PATCH v2 3/3] initramfs: introduce do_readxattrs() Roberto Sassu
2019-05-10 21:33   ` Jann Horn
2019-05-13 13:03     ` Roberto Sassu
2019-05-09 18:34 ` [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk Rob Landley
2019-05-10  6:56   ` Roberto Sassu
2019-05-10 11:49     ` Mimi Zohar
2019-05-10 20:46       ` Rob Landley
2019-05-10 22:38         ` Mimi Zohar
2019-05-11 22:44 ` Andy Lutomirski
2019-05-12  4:04   ` Rob Landley
2019-05-12  4:12     ` Rob Landley
2019-05-12  9:17 ` Dominik Brodowski
2019-05-12 10:18   ` hpa
2019-05-12 15:31     ` Dominik Brodowski
2019-05-13  0:02       ` Mimi Zohar [this message]
2019-05-13  0:21         ` hpa
2019-05-13  0:23       ` hpa
2019-05-12 12:52   ` Mimi Zohar
2019-05-12 17:05     ` Rob Landley
2019-05-12 19:43       ` Arvind Sankar
2019-05-13  7:49         ` Roberto Sassu
2019-05-13  9:07           ` Rob Landley
2019-05-13 12:08             ` Mimi Zohar
2019-05-13 12:47             ` Roberto Sassu
2019-05-13 17:20               ` Arvind Sankar
2019-05-13 17:51                 ` Arvind Sankar
2019-05-13 17:52                 ` Arvind Sankar
2019-05-13 18:36                   ` Mimi Zohar
2019-05-13 18:47                     ` Arvind Sankar
2019-05-13 22:09                       ` Mimi Zohar
2019-05-14  6:06                         ` Rob Landley
2019-05-14 14:44                           ` Arvind Sankar
2019-05-14  6:06               ` Rob Landley
2019-05-14 11:52                 ` Roberto Sassu
2019-05-14 15:12                   ` Rob Landley
2019-05-14 15:27                   ` Arvind Sankar
2019-05-14 15:57                     ` Arvind Sankar
2019-05-14 17:44                       ` Roberto Sassu
2019-05-15  1:00                         ` Arvind Sankar
2019-05-14 15:19               ` Andy Lutomirski
2019-05-14 16:33                 ` Roberto Sassu
2019-05-14 16:58                   ` Greg KH
2019-05-14 17:20                     ` Roberto Sassu
2019-05-15  0:25                       ` Arvind Sankar
2019-05-14 19:18                 ` James Bottomley
2019-05-14 23:39                   ` Rob Landley
2019-05-14 23:54                     ` James Bottomley
2019-05-15  0:52                       ` Arvind Sankar
2019-05-15 11:19                         ` Roberto Sassu
2019-05-15 16:08                           ` Arvind Sankar
2019-05-15 17:06                             ` Roberto Sassu
2019-05-16  5:29                               ` Arvind Sankar
2019-05-16 11:42                                 ` Roberto Sassu
2019-05-16 13:31                                 ` Mimi Zohar

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