AVC every server boot: SELinux is preventing the setxkbmap from using potentially mislabeled files (./.X11-unix).
Richard Chapman
rchapman at aardvark.com.au
Mon Aug 31 02:17:21 UTC 2009
Hi Daniel
FYI: I have just rebooted the system for the first time in ages - and
I'm still using /tmp as opposes to tmpfs - and received 2 more AVCs -
very similar to the previous ones. If I understood correctly - you were
not expecting this to re-occur. I haven't posted the AVCs because I
think they are much the same as the originals - but can do so if you are
interested.
This is not a major problem - but is one of the issues preventing me
from using "enforcing" mode. Any thoughts why it has re-occurred?
Richard.
Daniel J Walsh wrote:
> On 08/15/2009 01:05 AM, Richard Chapman wrote:
>
>> Daniel J Walsh wrote:
>>
>>> On 08/14/2009 12:19 AM, Richard Chapman wrote:
>>>
>>>
>>>> Daniel J Walsh wrote:
>>>>
>>>>
>>>>> On 08/12/2009 07:53 PM, Richard Chapman wrote:
>>>>>
>>>>>
>>>>>
>>>>>> I am running Centos 5.3 in permissive mode - and recently I started
>>>>>> getting 4 avcs every time I boot the server. I am not sure - but I
>>>>>> think
>>>>>> these might have started when I changed my desktop from Gnome to
>>>>>> KDE. I
>>>>>> have tried the relabelling suggested in the AVC - but this hasn't
>>>>>> fixed it.
>>>>>> Does it look like I have something set up wrong - or is there a policy
>>>>>> problem?
>>>>>> Richard.
>>>>>>
>>>>>>
>>>>>> Summary
>>>>>> SELinux is preventing the setxkbmap from using potentially mislabeled
>>>>>> files (./.X11-unix).
>>>>>> Detailed Description
>>>>>> [SELinux is in permissive mode, the operation would have been
>>>>>> denied but
>>>>>> was permitted due to permissive mode.]
>>>>>>
>>>>>> SELinux has denied setxkbmap access to potentially mislabeled file(s)
>>>>>> (./.X11-unix). This means that SELinux will not allow setxkbmap to use
>>>>>> these files. It is common for users to edit files in their home
>>>>>> directory or tmp directories and then move (mv) them to system
>>>>>> directories. The problem is that the files end up with the wrong file
>>>>>> context which confined applications are not allowed to access.
>>>>>>
>>>>>> Allowing Access
>>>>>> If you want setxkbmap to access this files, you need to relabel them
>>>>>> using restorecon -v './.X11-unix'. You might want to relabel the
>>>>>> entire
>>>>>> directory using restorecon -R -v './.X11-unix'.
>>>>>> Additional Information
>>>>>>
>>>>>> Source Context: system_u:system_r:rhgb_t
>>>>>> Target Context: system_u:object_r:initrc_tmp_t
>>>>>> Target Objects: ./.X11-unix [ dir ]
>>>>>> Source: setxkbmap
>>>>>> Source Path: /usr/bin/setxkbmap
>>>>>> Port: <Unknown>
>>>>>> Host: C5.aardvark.com.au
>>>>>> Source RPM Packages: xorg-x11-xkb-utils-1.0.2-2.1
>>>>>> Target RPM Packages: Policy RPM:
>>>>>> selinux-policy-2.4.6-225.el5
>>>>>> Selinux Enabled: True
>>>>>> Policy Type: targeted
>>>>>> MLS Enabled: True
>>>>>> Enforcing Mode: Permissive
>>>>>> Plugin Name: home_tmp_bad_labels
>>>>>> Host Name: C5.aardvark.com.au
>>>>>> Platform: Linux C5.aardvark.com.au 2.6.18-128.4.1.el5 #1 SMP Tue
>>>>>> Aug 4 20:19:25 EDT 2009 x86_64 x86_64
>>>>>> Alert Count: 34
>>>>>> First Seen: Sun Jan 11 17:55:13 2009
>>>>>> Last Seen: Mon Aug 10 18:13:15 2009
>>>>>> Local ID: 0950df01-cfad-420a-9e84-4996a8d31942
>>>>>> Line Numbers: Raw Audit Messages :
>>>>>>
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899195.897:15): avc:
>>>>>> denied { search } for pid=4022 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899195.897:15): avc:
>>>>>> denied { search } for pid=4022 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899195.897:15):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd74235b0 a2=13
>>>>>> a3=3d29351a30 items=0 ppid=4021 pid=4022 auid=4294967295 uid=0 gid=0
>>>>>> euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap" exe="/usr/bin/setxkbmap"
>>>>>> subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899195.897:15):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd74235b0 a2=13
>>>>>> a3=3d29351a30 items=0 ppid=4021 pid=4022 auid=4294967295 uid=0 gid=0
>>>>>> euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap" exe="/usr/bin/setxkbmap"
>>>>>> subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>>
>>>>>>
>>>>>> Summary
>>>>>> SELinux is preventing the setxkbmap from using potentially mislabeled
>>>>>> files (./.X11-unix).
>>>>>> Detailed Description
>>>>>> [SELinux is in permissive mode, the operation would have been
>>>>>> denied but
>>>>>> was permitted due to permissive mode.]
>>>>>>
>>>>>> SELinux has denied setxkbmap access to potentially mislabeled file(s)
>>>>>> (./.X11-unix). This means that SELinux will not allow setxkbmap to use
>>>>>> these files. It is common for users to edit files in their home
>>>>>> directory or tmp directories and then move (mv) them to system
>>>>>> directories. The problem is that the files end up with the wrong file
>>>>>> context which confined applications are not allowed to access.
>>>>>>
>>>>>> Allowing Access
>>>>>> If you want setxkbmap to access this files, you need to relabel them
>>>>>> using restorecon -v './.X11-unix'. You might want to relabel the
>>>>>> entire
>>>>>> directory using restorecon -R -v './.X11-unix'.
>>>>>> Additional Information
>>>>>>
>>>>>> Source Context: system_u:system_r:rhgb_t
>>>>>> Target Context: system_u:object_r:initrc_tmp_t
>>>>>> Target Objects: ./.X11-unix [ dir ]
>>>>>> Source: setxkbmap
>>>>>> Source Path: /usr/bin/setxkbmap
>>>>>> Port: <Unknown>
>>>>>> Host: C5.aardvark.com.au
>>>>>> Source RPM Packages: xorg-x11-xkb-utils-1.0.2-2.1
>>>>>> Target RPM Packages: Policy RPM:
>>>>>> selinux-policy-2.4.6-225.el5
>>>>>> Selinux Enabled: True
>>>>>> Policy Type: targeted
>>>>>> MLS Enabled: True
>>>>>> Enforcing Mode: Permissive
>>>>>> Plugin Name: home_tmp_bad_labels
>>>>>> Host Name: C5.aardvark.com.au
>>>>>> Platform: Linux C5.aardvark.com.au 2.6.18-128.4.1.el5 #1 SMP Tue
>>>>>> Aug 4 20:19:25 EDT 2009 x86_64 x86_64
>>>>>> Alert Count: 35
>>>>>> First Seen: Sun Jan 11 17:55:13 2009
>>>>>> Last Seen: Mon Aug 10 18:13:16 2009
>>>>>> Local ID: 0950df01-cfad-420a-9e84-4996a8d31942
>>>>>> Line Numbers: Raw Audit Messages :
>>>>>>
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899196.898:16): avc:
>>>>>> denied { search } for pid=4022 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899196.898:16): avc:
>>>>>> denied { search } for pid=4022 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899196.898:16):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd74235b0 a2=13
>>>>>> a3=8 items=0 ppid=1 pid=4022 auid=4294967295 uid=0 gid=0 euid=0 suid=0
>>>>>> fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap"
>>>>>> exe="/usr/bin/setxkbmap" subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899196.898:16):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd74235b0 a2=13
>>>>>> a3=8 items=0 ppid=1 pid=4022 auid=4294967295 uid=0 gid=0 euid=0 suid=0
>>>>>> fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap"
>>>>>> exe="/usr/bin/setxkbmap" subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>>
>>>>>>
>>>>>> Summary
>>>>>> SELinux is preventing the setxkbmap from using potentially mislabeled
>>>>>> files (./.X11-unix).
>>>>>> Detailed Description
>>>>>> [SELinux is in permissive mode, the operation would have been
>>>>>> denied but
>>>>>> was permitted due to permissive mode.]
>>>>>>
>>>>>> SELinux has denied setxkbmap access to potentially mislabeled file(s)
>>>>>> (./.X11-unix). This means that SELinux will not allow setxkbmap to use
>>>>>> these files. It is common for users to edit files in their home
>>>>>> directory or tmp directories and then move (mv) them to system
>>>>>> directories. The problem is that the files end up with the wrong file
>>>>>> context which confined applications are not allowed to access.
>>>>>>
>>>>>> Allowing Access
>>>>>> If you want setxkbmap to access this files, you need to relabel them
>>>>>> using restorecon -v './.X11-unix'. You might want to relabel the
>>>>>> entire
>>>>>> directory using restorecon -R -v './.X11-unix'.
>>>>>> Additional Information
>>>>>>
>>>>>> Source Context: system_u:system_r:rhgb_t
>>>>>> Target Context: system_u:object_r:initrc_tmp_t
>>>>>> Target Objects: ./.X11-unix [ dir ]
>>>>>> Source: setxkbmap
>>>>>> Source Path: /usr/bin/setxkbmap
>>>>>> Port: <Unknown>
>>>>>> Host: C5.aardvark.com.au
>>>>>> Source RPM Packages: xorg-x11-xkb-utils-1.0.2-2.1
>>>>>> Target RPM Packages: Policy RPM:
>>>>>> selinux-policy-2.4.6-225.el5
>>>>>> Selinux Enabled: True
>>>>>> Policy Type: targeted
>>>>>> MLS Enabled: True
>>>>>> Enforcing Mode: Permissive
>>>>>> Plugin Name: home_tmp_bad_labels
>>>>>> Host Name: C5.aardvark.com.au
>>>>>> Platform: Linux C5.aardvark.com.au 2.6.18-128.4.1.el5 #1 SMP Tue
>>>>>> Aug 4 20:19:25 EDT 2009 x86_64 x86_64
>>>>>> Alert Count: 36
>>>>>> First Seen: Sun Jan 11 17:55:13 2009
>>>>>> Last Seen: Mon Aug 10 18:13:17 2009
>>>>>> Local ID: 0950df01-cfad-420a-9e84-4996a8d31942
>>>>>> Line Numbers: Raw Audit Messages :
>>>>>>
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899197.933:18): avc:
>>>>>> denied { search } for pid=4041 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899197.933:18): avc:
>>>>>> denied { search } for pid=4041 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899197.933:18):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fff31d13e20 a2=13
>>>>>> a3=8 items=0 ppid=1 pid=4041 auid=4294967295 uid=0 gid=0 euid=0 suid=0
>>>>>> fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap"
>>>>>> exe="/usr/bin/setxkbmap" subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899197.933:18):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fff31d13e20 a2=13
>>>>>> a3=8 items=0 ppid=1 pid=4041 auid=4294967295 uid=0 gid=0 euid=0 suid=0
>>>>>> fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap"
>>>>>> exe="/usr/bin/setxkbmap" subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>>
>>>>>>
>>>>>>
>>>>>> Summary
>>>>>> SELinux is preventing the setxkbmap from using potentially mislabeled
>>>>>> files (./.X11-unix).
>>>>>> Detailed Description
>>>>>> [SELinux is in permissive mode, the operation would have been
>>>>>> denied but
>>>>>> was permitted due to permissive mode.]
>>>>>>
>>>>>> SELinux has denied setxkbmap access to potentially mislabeled file(s)
>>>>>> (./.X11-unix). This means that SELinux will not allow setxkbmap to use
>>>>>> these files. It is common for users to edit files in their home
>>>>>> directory or tmp directories and then move (mv) them to system
>>>>>> directories. The problem is that the files end up with the wrong file
>>>>>> context which confined applications are not allowed to access.
>>>>>>
>>>>>> Allowing Access
>>>>>> If you want setxkbmap to access this files, you need to relabel them
>>>>>> using restorecon -v './.X11-unix'. You might want to relabel the
>>>>>> entire
>>>>>> directory using restorecon -R -v './.X11-unix'.
>>>>>> Additional Information
>>>>>>
>>>>>> Source Context: system_u:system_r:rhgb_t
>>>>>> Target Context: system_u:object_r:initrc_tmp_t
>>>>>> Target Objects: ./.X11-unix [ dir ]
>>>>>> Source: setxkbmap
>>>>>> Source Path: /usr/bin/setxkbmap
>>>>>> Port: <Unknown>
>>>>>> Host: C5.aardvark.com.au
>>>>>> Source RPM Packages: xorg-x11-xkb-utils-1.0.2-2.1
>>>>>> Target RPM Packages: Policy RPM:
>>>>>> selinux-policy-2.4.6-225.el5
>>>>>> Selinux Enabled: True
>>>>>> Policy Type: targeted
>>>>>> MLS Enabled: True
>>>>>> Enforcing Mode: Permissive
>>>>>> Plugin Name: home_tmp_bad_labels
>>>>>> Host Name: C5.aardvark.com.au
>>>>>> Platform: Linux C5.aardvark.com.au 2.6.18-128.4.1.el5 #1 SMP Tue
>>>>>> Aug 4 20:19:25 EDT 2009 x86_64 x86_64
>>>>>> Alert Count: 37
>>>>>> First Seen: Sun Jan 11 17:55:13 2009
>>>>>> Last Seen: Mon Aug 10 18:13:19 2009
>>>>>> Local ID: 0950df01-cfad-420a-9e84-4996a8d31942
>>>>>> Line Numbers: Raw Audit Messages :
>>>>>>
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899199.903:20): avc:
>>>>>> denied { search } for pid=4022 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=AVC msg=audit(1249899199.903:20): avc:
>>>>>> denied { search } for pid=4022 comm="setxkbmap" name=".X11-unix"
>>>>>> dev=dm-0 ino=27590701 scontext=system_u:system_r:rhgb_t:s0
>>>>>> tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899199.903:20):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd74235b0 a2=13
>>>>>> a3=8 items=0 ppid=1 pid=4022 auid=4294967295 uid=0 gid=0 euid=0 suid=0
>>>>>> fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap"
>>>>>> exe="/usr/bin/setxkbmap" subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>> host=C5.aardvark.com.au type=SYSCALL msg=audit(1249899199.903:20):
>>>>>> arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd74235b0 a2=13
>>>>>> a3=8 items=0 ppid=1 pid=4022 auid=4294967295 uid=0 gid=0 euid=0 suid=0
>>>>>> fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295
>>>>>> comm="setxkbmap"
>>>>>> exe="/usr/bin/setxkbmap" subj=system_u:system_r:rhgb_t:s0 key=(null)
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> fedora-selinux-list mailing list
>>>>>> fedora-selinux-list at redhat.com
>>>>>> https://www.redhat.com/mailman/listinfo/fedora-selinux-list
>>>>>>
>>>>>>
>>>>> chcon -R -t xserver_tmp_t /tmp/.X11-unix
>>>>>
>>>>> I always use tmpfs for /tmp, so I never end up with garbage on a
>>>>> reboot.
>>>>>
>>>>>
>>>>>
>>>> Thanks Daniel - but this is the response...
>>>>
>>>> [root at C5 ~]# chcon -R -t xserver_tmp_t /tmp/.X11-unix
>>>> chcon: failed to change context of /tmp/.X11-unix to
>>>> system_u:object_r:xserver_t mp_t: Invalid
>>>> argument
>>>> chcon: failed to change context of /tmp/.X11-unix/X0 to
>>>> system_u:object_r:xserve r_tmp_t: Invalid
>>>> argument
>>>> chcon: failed to change context of /tmp/.X11-unix/X1005 to
>>>> user_u:object_r:xserv er_tmp_t: Invalid
>>>> argument
>>>> [root at C5 ~]#
>>>>
>>>> Being pretty green - I don't really understand the problem here. Also -
>>>> if this chcon worked - would this be a permanent solution - or does it
>>>> need to be executed in a boot script?
>>>> I like your idea of using tmpfs - but is it ever a problem that tmpfs is
>>>> relatively small and finite? Also - please excuse my ignorance - but how
>>>> do I make tmpfs the tmp folder?
>>>>
>>>> Richard.
>>>>
>>>>
>>>>
>>>>
>>> Must have changed between RHEL5 and F11
>>>
>>> Try
>>> chcon -R -t xdm_xserver_tmp_t /tmp/.X11-unix
>>>
>>> Add this line to /etc/fstab
>>>
>>> tmpfs /tmp tmpfs
>>> rootcontext="system_u:object_r:tmp_t:s0",defaults 0 0
>>>
>>> And reboot.
>>>
>>> I don't tend to store huge abouts of stuff in /tmp. If I want to
>>> store big stuff I can always use /var/tmp
>>>
>>>
>>>
>> Thanks Daniel
>>
>> That chcon command worked fine. Should this be a permanent solution - or
>> will new files appearing there need a chcon too? Should I put this
>> command into a boot script somewhere?
>>
>> I'll try tmpfs and see if it ever overflows in practice. Hopefully I'll
>> be able to see something in my logwatch if there is ever a problem.
>> Currently - It's using less than 1/2 its 2 gigs or ram - so there is
>> some room to spare. Seems your suggestion has sparked quite a bit of
>> interest...:-)
>>
>> Thanks again
>>
>> Richard.
>>
>>
>>
> No the chcon is fine. It was mislabeled at some point and relabeling does not touch /tmp
>
>
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