1

I was playing around with user_u in the targeted policy on RHEL 6.5. I'm logged in as root in the unconfined context, so I have full ability to change anything I want. I've also switched to permissive mode just in case. I originally had user_u set up to have the MLS/MCS settings "s0:c0.c50". This state was functioning properly with no issues(that I'm aware of). To test changing this with commands, I typed in this:

semanage user -m -r s0:c0.c51 user_u

This ran without any problems, and I was able to verify that it worked correctly with semanage user -l. user_u now has the MLS/MCS of "s0:c0.c51". However, if I try to modify user_u or either of the users tied to user_u(named bob and alice), I get an error that looks like this:

libsemanage.validate_handler: MLS range s0:c0.c50 for Unix user bob exceeds allowed range s0:c0.c51 for SELinux user user_u(No such file or directory).
libsemanage.validate_handler: seuser mapping [bob -> (user_u, s0:c0-c50)] is invalid (No such file or directory).
libsemanage.dbase_llist_iterate: could not iterate over records(No such file or directory).

The confusing part is that s0:c0.c50 'exceeds' s0:c0.c51. If I try to modify user_u, it complains about bob. If I try to delete bob, it complains about alice. If I try to delete alice, it complains about bob. I effectively can't change any of them(through the GUI tools or the command line).

Initially I tried backing out the changes from semanage and going back to user_u with s0:c0.c50, but that didn't work, so I tried s0-s0:c0.c1023, which also didn't work. I noticed the errors never mentioned s0-s0:c0.c1023 so it's like they're failing before really changing user_u's MCS/MLS.

I could only find a few examples that were similar online, and the only one that I found with advice said to delete the user mappings from /etc/selinux/targeted/seusers and to run semodule -B. I tried that, and semodule -B fails with the same error messages. I have also replaced the deleted portions of seusers and tried semodule -B to no avail.

Any thoughts on how to fix this? This was a sandbox environment so it's easy to just go back to the original image, but I won't have that luxury in a deployed environment.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.