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Bug 2165508 - Use of AUTORELABEL=0 to enable manual fix labeling leads to sulogin: tcgetattr failed
Summary: Use of AUTORELABEL=0 to enable manual fix labeling leads to sulogin: tcgetatt...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: policycoreutils
Version: 9.0
Hardware: All
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Petr Lautrbach
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-01-30 10:06 UTC by Welterlen Benoit
Modified: 2023-05-09 10:40 UTC (History)
5 users (show)

Fixed In Version: policycoreutils-3.5-0.rc2.3.el9
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-05-09 08:25:00 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-146852 0 None None None 2023-02-08 11:04:25 UTC
Red Hat Product Errata RHBA-2023:2561 0 None None None 2023-05-09 08:25:05 UTC

Description Welterlen Benoit 2023-01-30 10:06:43 UTC 
Description of problem:
When trying to use the option AUTORELABEL=0 in /etc/selinux/config to enter a shell a manually fix labels, it fails with 

---
Jan 27 15:35:30 localhost selinux-autorelabel[765]: *** Warning -- SELinux mls policy relabel is required.
Jan 27 15:35:30 localhost selinux-autorelabel[765]: *** /etc/selinux/config indicates you want to manually fix labeling
Jan 27 15:35:30 localhost selinux-autorelabel[765]: *** problems. Dropping you to a shell; the system will reboot
Jan 27 15:35:30 localhost selinux-autorelabel[765]: *** when you leave the shell.
Jan 27 15:35:30 localhost selinux-autorelabel[770]: sulogin: tcgetattr failed: Inappropriate ioctl for device
---

Version-Release number of selected component (if applicable):
RHEL9
selinux-policy-mls-34.1.29-1.el9_0.2.noarch
policycoreutils-3.3-6.el9_0.x86_64

# 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
Memory protection checking:     actual (secure)
Max kernel policy version:      33


How reproducible:
always

Steps to Reproduce:
1. put AUTORELABEL=0 in /etc/selinux/config
2. reboot
3.

Actual results:
sulogin: tcgetattr failed: Inappropriate ioctl for device

Expected results:
access to shell without error

Additional info:
Comment 1 Petr Lautrbach 2023-02-03 16:34:58 UTC 
selinux-autorelabel.service needs StandardInput=tty for this particular case. tty was dropped from the service back in 2019 as part of the fix for https://bugzilla.redhat.com/show_bug.cgi?id=1634661 so we can't simply bring it back. But it's possible to use tty conditionally based on AUTORELABEL variable:

~~~
diff --git a/selinux-autorelabel-generator.sh b/selinux-autorelabel-generator.sh
index be6048766dcc..d9380b8be75b 100644
--- a/selinux-autorelabel-generator.sh
+++ b/selinux-autorelabel-generator.sh
@@ -18,6 +18,15 @@ fi
 set_target ()
 {
     ln -sf "$unitdir/selinux-autorelabel.target" "$earlydir/default.target"
+    AUTORELABEL="1"
+    source /etc/selinux/config
+    if [ "$AUTORELABEL" = "0" ]; then
+        mkdir -p "$earlydir/selinux-autorelabel.service.d"
+        cat > "$earlydir/selinux-autorelabel.service.d/tty.conf" <<EOF
+[Service]
+StandardInput=tty
+EOF
+    fi
 }
 
 if selinuxenabled; then
~~~

Rawhide and centosstream 9 testing builds are available at https://copr.fedorainfracloud.org/coprs/plautrba/autorelabel0/
Comment 3 Petr Lautrbach 2023-02-08 11:03:42 UTC 
https://gitlab.com/redhat/centos-stream/rpms/policycoreutils/-/merge_requests/30
Comment 11 errata-xmlrpc 2023-05-09 08:25:00 UTC 
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 (policycoreutils bug fix and enhancement update), 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://access.redhat.com/errata/RHBA-2023:2561
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