Bug 568323 - SELinux is preventing /usr/libexec/gdm-session-worker "write" access on /root.
Summary: SELinux is preventing /usr/libexec/gdm-session-worker "write" access on /root.
Status: CLOSED DUPLICATE of bug 543970
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 12
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Daniel Walsh
QA Contact: Fedora Extras Quality Assurance
Whiteboard: setroubleshoot_trace_hash:a7bd65db7d4...
Depends On:
TreeView+ depends on / blocked
Reported: 2010-02-25 12:20 UTC by papseddy
Modified: 2011-02-24 07:15 UTC (History)
15 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2010-03-17 12:51:51 UTC

Attachments (Terms of Use)

Description papseddy 2010-02-25 12:20:23 UTC

SELinux is preventing /usr/libexec/gdm-session-worker "write" access on /root.

Detailed Description:

SELinux denied access requested by gdm-session-wor. It is not expected that this
access is required by gdm-session-wor and this access may signal an intrusion
attempt. It is also possible that the specific version or configuration of the
application is causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Please file a bug

Additional Information:

Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:object_r:admin_home_t:s0
Target Objects                /root [ dir ]
Source                        gdm-session-wor
Source Path                   /usr/libexec/gdm-session-worker
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           gdm-2.28.1-25.fc12
Target RPM Packages           filesystem-2.4.30-2.fc12
Policy RPM                    selinux-policy-3.6.32-59.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     (removed)
Platform                      Linux (removed) #1
                              SMP Mon Dec 21 06:04:56 UTC 2009 i686 i686
Alert Count                   2
First Seen                    Thu 14 Jan 2010 02:58:19 AM IST
Last Seen                     Thu 14 Jan 2010 02:58:19 AM IST
Local ID                      da183a7b-8e79-48d7-ac0f-711e9ab19dd9
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1263418099.784:26549): avc:  denied  { write } for  pid=2344 comm="gdm-session-wor" name="root" dev=dm-0 ino=81921 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir

node=(removed) type=SYSCALL msg=audit(1263418099.784:26549): arch=40000003 syscall=5 success=no exit=-13 a0=85af200 a1=80c2 a2=180 a3=1f items=0 ppid=2326 pid=2344 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=2 comm="gdm-session-wor" exe="/usr/libexec/gdm-session-worker" subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)

Hash String generated from  catchall,gdm-session-wor,xdm_t,admin_home_t,dir,write
audit2allow suggests:

#============= xdm_t ==============
#!!!! The source type 'xdm_t' can write to a 'dir' of the following types:
# var_log_t, xdm_log_t, pam_var_run_t, xdm_var_lib_t, xdm_var_run_t, xdm_home_t, pam_var_console_t, pcscd_var_run_t, var_lock_t, xkb_var_lib_t, xdm_rw_etc_t, root_t, tmp_t, var_t, user_fonts_t, user_tmpfs_t, xdm_spool_t, fonts_cache_t, user_home_dir_t, locale_t, var_auth_t, xserver_tmp_t, tmpfs_t, var_spool_t, user_tmp_t, var_lib_t, var_run_t, auth_cache_t, xdm_tmpfs_t, xserver_log_t, root_t, nfs_t

allow xdm_t admin_home_t:dir write;

Comment 1 Daniel Walsh 2010-02-25 13:57:04 UTC
Are you attempting to login as root?

Comment 2 dmachop 2010-03-17 06:00:26 UTC
(In reply to comment #1)
> Are you attempting to login as root?    

Yes, I've modified the user login screen so that it accepts the root login.
That is the username root and the corresponding password is accepted.  This feature was available at older version of fedora.

Is that the problem?

Comment 3 Daniel Walsh 2010-03-17 12:51:51 UTC
SELinux will not allow you to login as root, you can put the machine into permissive mode or add custom policy to allow it to happen, but the default policy will never allow an X User to login dirrectly as root.  It is considered too dangerous.

*** This bug has been marked as a duplicate of bug 543970 ***

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