selinux prevents msgrcv on restore message queues?

Serge E. Hallyn serue at us.ibm.com
Wed Mar 3 15:44:48 PST 2010


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.

thanks,
-serge



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