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Bug 1056148

Summary:

cannot log into GDM seeing just black screen

Product:

Red Hat Enterprise Linux 7

Reporter:

Vladimir Benes <vbenes>

Component:

selinux-policy

Assignee:

Miroslav Grepl <mgrepl>

Status:

CLOSED CURRENTRELEASE

QA Contact:

Michal Trunecka <mtruneck>

Severity:

urgent

Docs Contact:

Priority:

urgent

Version:

7.0

CC:

dwalsh, ebenes, mmalik, mtruneck, vbenes, vbudikov

Target Milestone:

Keywords:

Regression

Target Release:

7.0

Flags:

vbudikov: needinfo+
vbudikov: needinfo+

Hardware:

x86_64

OS:

Linux

Whiteboard:

Fixed In Version:

selinux-policy-3.12.1-122.el7

Doc Type:

Bug Fix

Doc Text:

Story Points:

---

Clone Of:

Environment:

Last Closed:

2014-06-13 10:59:34 UTC

Type:

Bug

Regression:

---

Mount Type:

---

Documentation:

---

CRM:

Verified Versions:

Category:

---

oVirt Team:

---

RHEL 7.3 requirements from Atomic Host:

Cloudforms Team:

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Target Upstream Version:

Embargoed:

Attachments:

Description	Flags
Enforcing mode	none
Permissive mode	none

Description Vladimir Benes 2014-01-21 15:14:22 UTC

Description of problem:
after final update I cannot log into session if selinux in enforcing mode. when moved to permissive I can restart gdm service and log into session

Version-Release number of selected component (if applicable):
gdm-3.8.4-9.el7.x86_64
selinux-policy-3.12.1-118.el7.noarch

How reproducible:
always

Steps to Reproduce:
1.update, reboot
2.log into gnome

Actual results:
just black screen after plymouth, after setenforce=0 I can restart gdm service and log in correctly

Expected results:
no obsatcles.

Additional info:

Comment 3 Miroslav Grepl 2014-01-21 15:32:32 UTC

Vladimir, 
could you try to downgrade systemd? Also are you getting AVC msgs?

Comment 4 Milos Malik 2014-01-21 15:43:07 UTC

Do you see any AVCs or USER_AVCs in enforcing mode?

Comment 5 Vera Budikova 2014-01-21 17:12:43 UTC

Created attachment 853385 [details]
Enforcing mode

Comment 6 Vera Budikova 2014-01-21 17:14:36 UTC

Created attachment 853386 [details]
Permissive mode

Comment 7 Vera Budikova 2014-01-21 17:15:41 UTC

Downgraded systemd:

systemd-207-13.el7 -> systemd-207-12.el7.x86_64

* Version of systemd-207-12.el7.x86_64:
  gdm is working in enforcing mode
  /var/log/audit/audit.log:
type=AVC msg=audit(1390323795.545:349): avc:  denied  { setattr } for  pid=2662 comm="gdm" name="gdm" dev="dm-1" ino=265341 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=dir

* Version of systemd-207-13.el7.x86_64 (see attachments):
enforcing mode:
avc_1_log

permissive mode:
avc_0_log

Comment 8 Milos Malik 2014-01-21 17:53:39 UTC

Could you run following command and then re-test the scenario?
# restorecon -R /var /run

It seems that the gdm directory is mislabeled.

Comment 9 Miroslav Grepl 2014-01-21 19:17:12 UTC

Also how did you get this system?

Comment 11 Vera Budikova 2014-01-22 09:39:01 UTC

I tested this in clean install and after an update.

Comment 12 Miroslav Grepl 2014-01-22 09:46:22 UTC

Ok we have more issues here. systemd issues should be fixed.

Any chance to re-test it with full auditing => we need to see what gdm tries to do. Maybe it is caused by systemd issue. So probably we will need to wait for another snap.

Comment 13 Michal Trunecka 2014-01-27 09:17:23 UTC

I tried the build RHEL-7.0-20140122 with selinux-policy-3.12.1-120.el7 and I could log in in enforcing mode, only that one AVC below appeared. Then I switched to permissive and logged in again, but no more AVCs showed up.


----
type=SYSCALL msg=audit(01/27/2014 04:02:07.989:45) : arch=x86_64 syscall=mkdir success=no exit=-13(Permission denied) a0=0x7fdcca67aa30 a1=0755 a2=0x7fdcca67aa38 a3=0x7fff61576b00 items=0 ppid=1 pid=662 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=gdm exe=/usr/sbin/gdm subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(01/27/2014 04:02:07.989:45) : avc:  denied  { create } for  pid=662 comm=gdm name=gdm scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=dir

Comment 14 Miroslav Grepl 2014-01-27 09:46:28 UTC

Any chance to have all testing with full auditing? Is there /var/gdm?

Comment 15 Michal Trunecka 2014-01-27 10:41:41 UTC

Ok, the AVC doesn't occur during the logging in but just after reboot. Here is the full AVC:

----
type=PATH msg=audit(01/27/2014 05:39:35.271:44) : item=1 name=/var/gdm objtype=CREATE 
type=PATH msg=audit(01/27/2014 05:39:35.271:44) : item=0 name=/var/ inode=133 dev=fd:01 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_t:s0 objtype=PARENT 
type=CWD msg=audit(01/27/2014 05:39:35.271:44) :  cwd=/ 
type=SYSCALL msg=audit(01/27/2014 05:39:35.271:44) : arch=x86_64 syscall=mkdir success=no exit=-13(Permission denied) a0=0x7f71b8724a90 a1=0755 a2=0x7f71b8724a98 a3=0x7fff7a251870 items=2 ppid=1 pid=673 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=gdm exe=/usr/sbin/gdm subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(01/27/2014 05:39:35.271:44) : avc:  denied  { create } for  pid=673 comm=gdm name=gdm scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=dir

Comment 16 Michal Trunecka 2014-01-27 10:43:10 UTC

...and here are AVCs in permisive:

----
type=PATH msg=audit(01/27/2014 05:42:15.899:43) : item=1 name=/var/gdm inode=1737097 dev=fd:01 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_t:s0 objtype=CREATE 
type=PATH msg=audit(01/27/2014 05:42:15.899:43) : item=0 name=/var/ inode=133 dev=fd:01 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_t:s0 objtype=PARENT 
type=CWD msg=audit(01/27/2014 05:42:15.899:43) :  cwd=/ 
type=SYSCALL msg=audit(01/27/2014 05:42:15.899:43) : arch=x86_64 syscall=mkdir success=yes exit=0 a0=0x7ff5ef63ba30 a1=0755 a2=0x7ff5ef63ba38 a3=0x7fff7ecb5ba0 items=2 ppid=1 pid=674 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=gdm exe=/usr/sbin/gdm subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(01/27/2014 05:42:15.899:43) : avc:  denied  { create } for  pid=674 comm=gdm name=gdm scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=dir 
----
type=PATH msg=audit(01/27/2014 05:42:15.906:44) : item=0 name=/var/gdm inode=1737097 dev=fd:01 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_t:s0 objtype=NORMAL 
type=CWD msg=audit(01/27/2014 05:42:15.906:44) :  cwd=/ 
type=SYSCALL msg=audit(01/27/2014 05:42:15.906:44) : arch=x86_64 syscall=chmod success=yes exit=0 a0=0x7ff5ee61df49 a1=0711 a2=0x7ff5ed0be768 a3=0x7fff7ecb5ba0 items=1 ppid=1 pid=674 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=gdm exe=/usr/sbin/gdm subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(01/27/2014 05:42:15.906:44) : avc:  denied  { setattr } for  pid=674 comm=gdm name=gdm dev="dm-1" ino=1737097 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=dir

Comment 17 Miroslav Grepl 2014-01-27 10:54:27 UTC

Great. Thanks.

commit 1a0054369860ecd7aaf351d2a104aea0825dc454
Author: Miroslav Grepl <mgrepl>
Date:   Mon Jan 27 11:53:36 2014 +0100

    Allow gdm to create /var/gdm with correct labeling

Comment 20 Ludek Smid 2014-06-13 10:59:34 UTC

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.