Bug 595355 - SELinux is preventing /usr/libexec/gnome-settings-daemon "getattr" access on /media/borntoshare/pics/backgrounds/nebula-1920x1080.jpg.
SELinux is preventing /usr/libexec/gnome-settings-daemon "getattr" access ...
Status: CLOSED NOTABUG
Product: Fedora
Classification: Fedora
Component: selinux-policy (Show other bugs)
13
x86_64 Linux
low Severity medium
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Assigned To: Daniel Walsh
Fedora Extras Quality Assurance
setroubleshoot_trace_hash:cd4fde28519...
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2010-05-24 08:51 EDT by Bernhard Schuster
Modified: 2010-05-24 17:15 EDT (History)
2 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2010-05-24 17:15:59 EDT
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Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Description Bernhard Schuster 2010-05-24 08:51:04 EDT
Summary:

SELinux is preventing /usr/libexec/gnome-settings-daemon "getattr" access on
/media/borntoshare/pics/backgrounds/nebula-1920x1080.jpg.

Detailed Description:

SELinux denied access requested by gnome-settings-. It is not expected that this
access is required by gnome-settings- 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://docs.fedoraproject.org/selinux-faq-fc5/#id2961385) Please file a bug
report.

Additional Information:

Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:mnt_t:s0
Target Objects                /media/borntoshare/pics/backgrounds/nebula-
                              1920x1080.jpg [ file ]
Source                        gnome-settings-
Source Path                   /usr/libexec/gnome-settings-daemon
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           gnome-settings-daemon-2.30.1-6.fc13
Target RPM Packages           
Policy RPM                    selinux-policy-3.7.19-15.fc13
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     (removed)
Platform                      Linux (removed)
                              2.6.33.4-95.fc13.x86_64 #1 SMP Thu May 13 05:16:23
                              UTC 2010 x86_64 x86_64
Alert Count                   3
First Seen                    Mon 24 May 2010 02:38:11 PM CEST
Last Seen                     Mon 24 May 2010 02:38:12 PM CEST
Local ID                      81dd2aea-4d2a-44b6-93f2-c22a460cd791
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1274704692.250:16): avc:  denied  { getattr } for  pid=1841 comm="gnome-settings-" path="/media/borntoshare/pics/backgrounds/nebula-1920x1080.jpg" dev=dm-2 ino=53346480 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:mnt_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1274704692.250:16): arch=c000003e syscall=6 success=no exit=-13 a0=d4cf80 a1=7fff3bd85090 a2=7fff3bd85090 a3=1 items=0 ppid=1 pid=1841 auid=4294967295 uid=42 gid=479 euid=42 suid=42 fsuid=42 egid=479 sgid=479 fsgid=479 tty=(none) ses=4294967295 comm="gnome-settings-" exe="/usr/libexec/gnome-settings-daemon" subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  catchall,gnome-settings-,xdm_t,mnt_t,file,getattr
audit2allow suggests:

#============= xdm_t ==============
allow xdm_t mnt_t:file getattr;
Comment 1 Bernhard Schuster 2010-05-24 08:54:01 EDT
gdm does not show the picture as supposed ( I made the nebula-1920x1080 the default background), but after logging in it gets shown
Comment 2 Daniel Walsh 2010-05-24 12:10:33 EDT
This looks like a temporary device?  How are you mounting this borntoshare directory?

You can use a context="system_u:object_r:etc_t:s0" mount flag to tell the system to treat this file system as an etc_t directory.  THen gdm could read it.
Comment 3 Bernhard Schuster 2010-05-24 14:55:56 EDT
I mount it by default via /etc/fstab and it is an internal haraddisk with more or less private data

/dev/mapper/luks-6f7a80f0-33ae-4538-bba1-ed82ca9a56f9 /media/borntoshare      ext4    defaults        1 2
Comment 4 Bernhard Schuster 2010-05-24 15:23:26 EDT
ok, so in the end this is expected behavior, or at most a quirky "Appearance Preferences" Dialog not enabling system access for selinux to the default wallpaper
Comment 5 Daniel Walsh 2010-05-24 17:15:59 EDT
Another option would be to execute the following

# semanage fcontext -a -t usr_t '/media/borntoshare/pics(/.*?)'
# restorecon -R -v /media/borntoshare/pics

This will put a label of usr_t (same as /usr) on the pictures and then gdm will be allowed to read them.

And this is expected behaviour.  We do not want to allow a program like gdm to be able to read any files on your system.  So files under /media by default are not readable.

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