[Devel] Re: [Lxc-users] Kernel 2.6.33-rc6, 3 bugs container specific.

Jean-Marc Pigeon jmp at safe.ca
Wed Feb 3 07:48:10 PST 2010


Hello,

[...]
> > 
> > The prink keeps writing in the global ring buffer and the syslog(2)
> > writes to the "namespaced" ring buffer.
> > 
> > Does it makes sense ?
> 
> Yeah, it's a nice alternative.  Though (1) there is something to be said for
> forcing a new ring buffer upon clone(CLONE_NEWUSER), and (2) assuming the
> new ring buffer is pointed to from nsproxy, it might be frowned upon to do
> an unshare/clone action in yet another way.
> 
> I still think our first concern should be safety, and that we should consider
> just adding 'struct syslog_struct' to nsproxy, and making that NULL on a
> clone(CLONE_NEWUSER).  any sys_syslog() or /proc/kmsg access returns -EINVAL
> after that.  Then we can discuss whether and how to target printks to
> namespaces, and whether duplicates should be sent to parent namespaces.
	/proc/kmsg=-EINVAL  will resolve the own HOST: ring buffer corruption
	not sure what sys_syslog()=-EINVAL mean???, rsyslog MUST be able to
	run within CONT: right?

	printk namespaces duplicate and sent to parent namespace
	is not a good idea (duplicating&forwarding is done by tools as rsyslogd).
> 
> After we start getting flexible with syslog, the next request will be for
> audit flexibility.  I don't even know how our netlink support suffices for
> that right now.
> 
> (So, this all does turn into a big deal...)
> 
> -serge
-- 
A bientôt
==========================================================================
Jean-Marc Pigeon                                   Internet: jmp at safe.ca
SAFE Inc.                                          Phone: (514) 493-4280
                                                   Fax:   (514) 493-1946
        Clement, 'a kiss solution' to get rid of SPAM (at last)
           Clement' Home base <"http://www.clement.safe.ca">
==========================================================================

_______________________________________________
Containers mailing list
Containers at lists.linux-foundation.org
https://lists.linux-foundation.org/mailman/listinfo/containers




More information about the Devel mailing list