Bug 542583 - SELinux is preventing /bin/mount access to a leaked file file descriptor.
Summary: SELinux is preventing /bin/mount access to a leaked file file descriptor.
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 12
Hardware: x86_64
OS: Linux
low
medium
Target Milestone: ---
Assignee: Daniel Walsh
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: setroubleshoot_trace_hash:00eb37c870b...
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2009-11-30 09:02 UTC by Lukas Redynk
Modified: 2010-01-08 20:07 UTC (History)
3 users (show)

Fixed In Version: 3.6.32-66.fc12
Clone Of:
Environment:
Last Closed: 2010-01-05 22:58:33 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Lukas Redynk 2009-11-30 09:02:51 UTC
Summary:

SELinux is preventing /bin/mount access to a leaked file file descriptor.

Detailed Description:

[mount has a permissive type (mount_t). This access was not denied.]

SELinux denied access requested by the mount command. It looks like this is
either a leaked descriptor or mount output was redirected to a file it is not
allowed to access. Leaks usually can be ignored since SELinux is just closing
the leak and reporting the error. The application does not use the descriptor,
so it will run properly. If this is a redirection, you will not get output in
the file. You should generate a bugzilla on selinux-policy, and it will get
routed to the appropriate package. You can safely ignore this avc.

Allowing Access:

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

Additional Information:

Source Context                system_u:system_r:mount_t:s0
Target Context                system_u:object_r:anon_inodefs_t:s0
Target Objects                file [ file ]
Source                        mount
Source Path                   /bin/mount
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           util-linux-ng-2.16-10.2.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-46.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   leaks
Host Name                     (removed)
Platform                      Linux (removed)
                              2.6.31.5-127.fc12.x86_64 #1 SMP Sat Nov 7 21:11:14
                              EST 2009 x86_64 x86_64
Alert Count                   5
First Seen                    Mon 30 Nov 2009 09:59:46 AM CET
Last Seen                     Mon 30 Nov 2009 09:59:46 AM CET
Local ID                      d081198c-e2cb-428e-8ed7-e99815426db8
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1259571586.434:13): avc:  denied  { write } for  pid=2473 comm="mount" path="anon_inode:[eventfd]" dev=anon_inodefs ino=568 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file

node=(removed) type=AVC msg=audit(1259571586.434:13): avc:  denied  { write } for  pid=2473 comm="mount" path="anon_inode:[eventfd]" dev=anon_inodefs ino=568 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file

node=(removed) type=AVC msg=audit(1259571586.434:13): avc:  denied  { write } for  pid=2473 comm="mount" path="anon_inode:[eventfd]" dev=anon_inodefs ino=568 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file

node=(removed) type=AVC msg=audit(1259571586.434:13): avc:  denied  { write } for  pid=2473 comm="mount" path="anon_inode:[eventfd]" dev=anon_inodefs ino=568 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file

node=(removed) type=AVC msg=audit(1259571586.434:13): avc:  denied  { write } for  pid=2473 comm="mount" path="anon_inode:[eventfd]" dev=anon_inodefs ino=568 scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1259571586.434:13): arch=c000003e syscall=59 success=yes exit=0 a0=ba12c0 a1=ba0410 a2=ba01a0 a3=7fffa728a560 items=0 ppid=1054 pid=2473 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="mount" exe="/bin/mount" subj=system_u:system_r:mount_t:s0 key=(null)



Hash String generated from  selinux-policy-3.6.32-46.fc12,leaks,mount,mount_t,anon_inodefs_t,file,write
audit2allow suggests:

#============= mount_t ==============
allow mount_t anon_inodefs_t:file write;

Comment 1 Daniel Walsh 2009-11-30 22:15:04 UTC
Do you know what tool is creating this?  Is this happening from a cron job?

Comment 2 Ed Berg 2009-12-18 09:42:01 UTC
I am not the original reporter of this bug. However, the report above looks nearly identical to what I am seeing, so I thought I would throw in my 2 cents. This occurs this after creating a shared folder in the following setup:
- VMware Player 3.0.0 build-203739
- Host: Windows 7 Professional, 64-bit
- Guest: Fedora 12 (2.6.31.6-166.fc12.i686 #1 SMP Wed Dec 9 11:14:59 EST 2009 i686 i686 i386 GNU/Linux)
- Virtual machine is playing

The automatic mount fails as there is nothing under /mnt/hgfs. A manual mount (mount -t vmhgfs .host:/ /mnt/hgfs) works, as does the mount that occurs after reboot.

So, at least for the combination of VMware Player and Fedora 12, this is only an inconvenience for someone that is creating temporary shared folders on the fly.

Comment 3 Daniel Walsh 2009-12-18 13:33:40 UTC
If you add this rule using

# grep avc /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Does it fix your problem?

I will  add this allow rule in the next release.

Fixed in selinux-policy-3.6.32-60.fc12.noarch

But Ed, I am not sure this is your problem.

Comment 4 Fedora Update System 2009-12-22 21:54:23 UTC
selinux-policy-3.6.32-63.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/selinux-policy-3.6.32-63.fc12

Comment 5 Fedora Update System 2010-01-04 21:51:13 UTC
selinux-policy-3.6.32-66.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/selinux-policy-3.6.32-66.fc12

Comment 6 Fedora Update System 2010-01-05 22:47:05 UTC
selinux-policy-3.6.32-66.fc12 has been pushed to the Fedora 12 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update selinux-policy'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2010-0184

Comment 7 Fedora Update System 2010-01-05 22:56:05 UTC
selinux-policy-3.6.32-63.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2010-01-08 20:01:53 UTC
selinux-policy-3.6.32-66.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.


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