From: Kylene Jo Hall <kjhall@us.ibm.com>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
LSM ML <linux-security-module@vger.kernel.org>,
Dave Safford <safford@us.ibm.com>, Mimi Zohar <zohar@us.ibm.com>,
Serge Hallyn <sergeh@us.ibm.com>
Subject: Re: [PATCH 3/7] SLIM main patch
Date: Wed, 23 Aug 2006 15:20:03 -0700 [thread overview]
Message-ID: <1156371603.6720.101.camel@localhost.localdomain> (raw)
In-Reply-To: <20060823204109.GI28594@kvack.org>
On Wed, 2006-08-23 at 16:41 -0400, Benjamin LaHaise wrote:
> On Wed, Aug 23, 2006 at 01:35:56PM -0700, Kylene Jo Hall wrote:
> > Example: The current process is running at the USER level and writing to
> > a USER file in /home/user/. The process then attempts to read an
> > UNTRUSTED file. The current process will become UNTRUSTED and the read
> > allowed to proceed but first write access to all USER files is revoked
> > including the ones it has open.
>
> Don't threads share file tables? What is preventing malicious code from
> starting another thread which continues writing to the file that the
> revoke attempt is made on?
Well if they do share file tables then revoking write access from the
file in the file table will revoke access for all threads. It looks
like sharing or copying the file table is based on a flag to the clone
call and we are looking into whether you could exploit that situation.
Thanks,
Kylie
>
> -ben
next prev parent reply other threads:[~2006-08-23 22:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-23 19:05 [PATCH 3/7] SLIM main patch Kylene Jo Hall
2006-08-23 19:27 ` Benjamin LaHaise
2006-08-23 20:35 ` Kylene Jo Hall
2006-08-23 20:41 ` Benjamin LaHaise
2006-08-23 22:20 ` Kylene Jo Hall [this message]
2006-08-24 8:31 ` Arjan van de Ven
2006-08-24 11:26 ` Alan Cox
2006-08-24 13:32 ` Serge E. Hallyn
2006-08-24 13:37 ` Benjamin LaHaise
2006-08-24 13:58 ` Serge E. Hallyn
2006-08-24 14:00 ` Benjamin LaHaise
2006-08-24 14:16 ` Serge E. Hallyn
2006-08-24 14:15 ` Alan Cox
2006-08-24 15:23 ` Serge E. Hallyn
2006-08-24 17:05 ` Alan Cox
2006-08-24 17:34 ` David Safford
2006-08-24 19:16 ` Serge E. Hallyn
2006-08-24 20:21 ` David Safford
2006-08-24 20:41 ` Mimi Zohar
2006-08-24 22:13 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2006-09-12 17:57 Kylene Jo Hall
2006-09-14 23:52 ` Andrew Morton
2006-09-15 16:57 ` Kylene Jo Hall
2006-09-26 18:44 ` Stephen Smalley
2006-10-19 20:48 ` Kylene Jo Hall
2006-10-20 15:32 ` Stephen Smalley
2006-10-20 17:58 ` Stephen Smalley
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1156371603.6720.101.camel@localhost.localdomain \
--to=kjhall@us.ibm.com \
--cc=bcrl@kvack.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=safford@us.ibm.com \
--cc=sergeh@us.ibm.com \
--cc=zohar@us.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox