lkml.org 
[lkml]   [2017]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 06/15] ima: add parser of digest lists metadata
Quoting Mimi Zohar (zohar@linux.vnet.ibm.com):
> On Mon, 2017-11-20 at 10:40 +0100, Roberto Sassu wrote:
> > On 11/19/2017 12:23 AM, Mimi Zohar wrote:
> > > Hi Serge,
> > >
> > > On Fri, 2017-11-17 at 22:20 -0600, Serge E. Hallyn wrote:
> > >> On Tue, Nov 07, 2017 at 11:37:01AM +0100, Roberto Sassu wrote:
> > >>> from a predefined position (/etc/ima/digest_lists/metadata), when rootfs
> > >>> becomes available. Digest lists must be loaded before IMA appraisal is in
> > >>> enforcing mode.
> > >>
> > >> I'm sure there's a good reason for it, but this seems weird to me.
> > >> Why read it from a file on disk instead of accepting it through say
> > >> a securityfile write?
> >
> > There are two reasons.
> >
> > Digest lists must be loaded before any file is accessed, otherwise IMA
> > will deny the operation if appraisal is in enforcing mode. With digest
> > lists it is possible to appraise files in the initial ram disk without
> > including extended attributes (the default policy excludes those files).
>
> There are a number of people interested in extending CPIO to support
> extended attributes, not just for IMA-appraisal. (Years ago I started
> but unfortunately haven't had time to finish it.)  Isn't the right
> solution to add extended attribute support to CPIO?

(For the record) Yes, yes it is.

\
 
 \ /
  Last update: 2017-11-20 17:53    [W:0.042 / U:0.488 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site