From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Gergely Nagy <algernon@balabit.hu>
Cc: Marc Koschewski <marc@osknowledge.org>,
david@lang.hm, "Serge E. Hallyn" <serge@hallyn.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
James Morris <jmorris@namei.org>
Subject: Re: CAP_SYSLOG, 2.6.38 and user space
Date: Fri, 4 Feb 2011 11:08:42 +0000 [thread overview]
Message-ID: <20110204110842.33da9ac2@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <1296808804.24742.6.camel@moria>
> Having both CAP_SYS_ADMIN and CAP_SYSLOG at the same time, for the sole
> purpose of reading kernel log messages would kind of defeat the purpose
> of CAP_SYSLOG. Therefore, a solution that allows both at the same time
> doesn't look all that good to me.
If you do it right you don't need both, you need either, so old code will
use CAP_SYS_ADMIN and work, newer code will use CAP_SYSLOG and work but
hold less rights. In a couple of years you can then drop the
CAP_SYS_ADMIN ability to read log files, providing it is in the list of
API deprecations soon...
> However, having it toggle-able does, and solves all my worries at least:
> defaulting to CAP_SYS_ADMIN maintains backwards compatibility, upgraded
> systems can switch to CAP_SYSLOG if and when the system is ready for
> that. All's well!
Still a mess, we don't break ABIs at random so this patch needs reverting
or fixing ASAP, otherwise Linus will just revert it anyway..
Alan
next prev parent reply other threads:[~2011-02-04 11:06 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-03 11:39 Gergely Nagy
2011-02-03 15:13 ` Alan Cox
2011-02-03 15:32 ` Serge E. Hallyn
2011-02-03 15:53 ` Gergely Nagy
2011-02-03 16:51 ` Serge E. Hallyn
2011-02-03 17:07 ` Gergely Nagy
2011-02-04 0:49 ` david
2011-02-04 8:03 ` Marc Koschewski
2011-02-04 8:40 ` Gergely Nagy
2011-02-04 11:08 ` Alan Cox [this message]
2011-02-04 16:03 ` Serge E. Hallyn
2011-02-03 15:54 ` Nick Bowler
2011-02-04 16:05 ` Serge E. Hallyn
2011-02-04 16:33 ` Gergely Nagy
2011-02-04 17:15 ` Serge E. Hallyn
2011-02-05 7:05 ` david
2011-02-06 1:18 ` Serge E. Hallyn
2011-02-09 21:23 ` Serge E. Hallyn
2011-02-09 21:28 ` Gergely Nagy
2011-02-09 21:34 ` david
2011-02-09 21:40 ` Gergely Nagy
2011-02-09 21:47 ` david
2011-02-09 22:04 ` Gergely Nagy
2011-02-09 22:27 ` david
2011-02-09 22:37 ` Gergely Nagy
2011-02-10 14:29 ` Serge E. Hallyn
2011-02-09 19:50 ` Gergely Nagy
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