Bug 560216

Summary:

SELinux is preventing gdm-session-wor (xdm_t) "write" to .xsession-errors
(user_home_t).

Detailed Description:

[gdm-session-wor has a permissive type (xdm_t). This access was not denied.]

SELinux denied access requested by gdm-session-wor. The current boolean settings
do not allow this access. If you have not setup gdm-session-wor to require this
access this may signal an intrusion attempt. If you do intend this access you
need to change the booleans on this system to allow the access.

Allowing Access:

Confined processes can be configured to to run requiring different access,
SELinux provides booleans to allow you to turn on/off access as needed. The
boolean allow_polyinstantiation is set incorrectly.
Boolean Description:
Enable polyinstantiated directory support.


Fix Command:

# setsebool -P allow_polyinstantiation 1

Additional Information:

Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:user_home_t:s0
Target Objects                .xsession-errors [ file ]
Source                        gdm-session-wor
Source Path                   /usr/libexec/gdm-session-worker
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           gdm-2.26.1-13.fc11
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.12-82.fc11
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   catchall_boolean
Host Name                     (removed)
Platform                      Linux (removed) 2.6.30.5-43.fc11.x86_64 #1 SMP Thu
                              Aug 27 21:39:52 EDT 2009 x86_64 x86_64
Alert Count                   2
First Seen                    Sun 27 Sep 2009 01:46:47 PM CEST
Last Seen                     Sun 27 Sep 2009 01:46:47 PM CEST
Local ID                      603f118f-634a-4da5-9f1c-20438ad1c2d5
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1254052007.992:32462): avc:  denied  { write } for  pid=2885 comm="gdm-session-wor" name=".xsession-errors" dev=dm-1 ino=28830 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1254052007.992:32462): arch=c000003e syscall=77 success=yes exit=0 a0=9 a1=0 a2=7fff34ed4780 a3=4 items=0 ppid=2839 pid=2885 auid=501 uid=501 gid=501 euid=501 suid=501 fsuid=501 egid=501 sgid=501 fsgid=501 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  selinux-policy-3.6.12-82.fc11,catchall_boolean,gdm-session-wor,xdm_t,user_home_t,file,write
audit2allow suggests:

#============= xdm_t ==============
#!!!! This avc is allowed in the current policy

allow xdm_t user_home_t:file write;