linux-kernel - Re: Syslog-NG Fails as of Kernel 2.6.38-rc1

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Date:	Mon, 31 Jan 2011 21:14:15 +0100
From:	Marc Koschewski <marc@...nowledge.org>
To:	Gergely Nagy <algernon@...abit.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Syslog-NG Fails as of Kernel 2.6.38-rc1

* Gergely Nagy <algernon@...abit.hu> [2011-01-28 11:21:36 +0100]:

I wonder why Linus himself didn't come up on this. I remember him saying that
breaking userspace is crap a thousand times. And this thing here bugs me a lot!

As far as I remember the kmsg rights-thing was only for some just-in-case attack
scenario - what's absolutely _no_ reason to break userspace _now_.

Regards,
	Marc

> > > The following appears in dmesg from kernels 2.6.38-rc1 to
> > > 2.6.38-rc2-git5 (Not an issue in 2.6.37 stable):
> 
> [...]
> 
> > > ----------
> > > ::Starting Syslg-NG            [BUSY] Error opening file for reading:
> > > filename '/proc/kmsg', error='Operation not permitted (1)'
> > > Error initializing source driver: source='src', id='src#2' Error
> > > initializing message pipline;
> > >                     [FAIL]
> 
> The problem is, that syslog-ng doesn't have the CAP_SYSLOG capability,
> only CAP_SYS_ADMIN, which was enough pre-2.6.38. In 2.6.38+ however, one
> needs CAP_SYSLOG (it was split out from CAP_SYS_ADMIN).
> 
> Which pretty much means that any userspace code that was using
> CAP_SYS_ADMIN to access /proc/kmsg will have to be updated to use
> CAP_SYSLOG (either instead, or in addition to CAP_SYS_ADMIN) in order to
> work on new kernels.
> 
> I find that quite unfortunate, to be honest, as older applications that
> aren't upgraded along with the kernel will simply break.
> 
> -- 
> |8]
> 
> 
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-- 
Marc Koschewski
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