[Devel] Re: selinux prevents msgrcv on restore message queues?

[Nathan Lynch]

On Wed, 2010-03-03 at 17:44 -0600, Serge E. Hallyn wrote:
> Quoting Nathan Lynch (ntl at pobox.com):
> > On Wed, 2010-03-03 at 13:49 -0600, Serge E. Hallyn wrote:
> > > Quoting Nathan Lynch (ntl at pobox.com):
> > > > On Tue, 2010-03-02 at 19:19 -0600, Serge E. Hallyn wrote:
> > > > > Can you try the following patch?
> > > > > 
> > > > > Also, to actually restore the LSM labels you need to add -k to your
> > > > > restart flags, but without the -k you should get a sane default
> > > > > security label.
> > > > 
> > > > Thanks, the ipc/mq tests pass with this patch and restart -k.  Without
> > > > -k the tests still fail in the same manner (msgrcv fails).  Is that the
> > > > behavior you'd expect?
> > > 
> > > Not really - the test runs as unconfined_u right?
> > 
> > I added a ps -Z to test-mq.sh before thawing:
> > 
> > # PATH=/root/cr/user-cr.git:$PATH bash test-mq.sh 
> > Using output dir ./cr_mq_6T8KIG6
> > XXX Test 1: simple restart with SYSVIPC msq
> > check-mq: no process killed
> > ../common.sh: line 45:  5173 Killed                  ( sleep $1; kill -s USR1 $$ )
> > LABEL                             PID TTY          TIME CMD
> > unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 4358 pts/1 00:00:00 bash
> > unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 5151 pts/1 00:00:00 bash
> > unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 5172 pts/1 00:00:00 nsexec
> > unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 5175 pts/1 00:00:00 sleep
> > unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 5178 pts/1 00:00:00 check-
> > unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 5183 pts/1 00:00:00 ps
> > PASS
> 
> Can you try the following patch?
> 
> (this is on top of the last one - I'd sent)
> 
> The problem is that selinux does not assign a label to a msg_msg
> until you do msgsnd.  So it may be best to special-case the
> msg_msg object type and always have it restore the msgtype.  One
> reason *NOT* to do that woudl be that the restarter might not have
> msg_msg:restore permission...  But pls let me know if this patch
> fixes your problem.

Yes, with both patches applied to ckpt-v19-dev
(261322990a4ed23c8475c232423845f998dd4f89) the tests pass with and
without the -k flag.



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