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commit c2657a8bf1c76fda2b2cab764cf94ea51d6f6930
Author: Miroslav Grepl <mgrepl>
Date: Tue Dec 2 14:40:18 2014 +0100
Allow admin SELinux users mounting / as private within a new mount namespace as root in MLS.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-0458.html
Description of problem: When mounting "/" as user root (with sysadm_r role) in SELinux policy MLS within a new mount namespace by: mount("none", "/", "none", MS_REC|MS_PRIVATE, NULL); error is returned: errno=EACCES(13): Permission denied # sestatus SELinux status: enabled SELinuxfs mount: /sys/fs/selinux SELinux root directory: /etc/selinux Loaded policy name: mls Current mode: enforcing Mode from config file: enforcing Policy MLS status: enabled Policy deny_unknown status: denied Max kernel policy version: 28 # ausearch -m avc -ts recent | audit2why type=AVC msg=audit(1409051210.963:1380): avc: denied { mounton } for pid=32494 comm="mountns01" path="/" dev="dm-1" ino=128 scontext=staff_u:sysadm_r:sysadm_t:s0-s15:c0.c1023 tcontext=system_u:object_r:root_t:s0 tclass=dir Was caused by: Missing type enforcement (TE) allow rule. # ausearch -m avc -ts recent | grep mount | audit2allow #============= sysadm_t ============== allow sysadm_t root_t:dir mounton; Version-Release number of selected component (if applicable): selinux-policy-3.12.1-153.el7.noarch selinux-policy-mls-3.12.1-153.el7.noarch kernel-3.10.0-123.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. newrole -r sysadm_r 2. /bin/su - 3. Download se_test.c from attachments 4. gcc se_test.c -o se_test; ./se_test 5. Permission denied Actual results: Mounting "/" as private within a new mount namespace as root (with sysadm_r role) in SELinux policy MLS doesn't work, it returns error (errno=EACCES(13): Permission denied). Expected results: Mounting "/" as private within a new mount namespace as root (with sysadm_r role) in SELinux policy MLS does work. Additional info: