SELinux is preventing npviewer.bin (nsplugin_t) "read" to ./pulse-shm-4180703699

[Antonio Olivares]

Dear fellow selinux experts,

Net avc for npviewer :(  


Summary:

SELinux is preventing npviewer.bin (nsplugin_t) "read" to
./pulse-shm-4180703699
(tmpfs_t).

Detailed Description:

SELinux denied access requested by npviewer.bin. It is not expected that this
access is required by npviewer.bin 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:

Sometimes labeling problems can cause SELinux denials. You could try to restore
the default system file context for ./pulse-shm-4180703699,

restorecon -v './pulse-shm-4180703699'

If this does not work, there is currently no automatic way to allow this access.
Instead, you can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable
SELinux protection altogether. Disabling SELinux protection is not recommended.
Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.

Additional Information:

Source Context                unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c102
                              3
Target Context                unconfined_u:object_r:tmpfs_t:s0
Target Objects                ./pulse-shm-4180703699 [ file ]
Source                        npviewer.bin
Source Path                   /usr/lib/nspluginwrapper/npviewer.bin
Port                          <Unknown>
Host                          riohigh
Source RPM Packages           nspluginwrapper-1.1.4-1.fc11
Target RPM Packages           
Policy RPM                    selinux-policy-3.5.13-18.fc10
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   catchall_file
Host Name                     riohigh
Platform                      Linux riohigh 2.6.27.5-117.fc10.i686 #1 SMP Tue
                              Nov 18 12:19:59 EST 2008 i686 athlon
Alert Count                   1
First Seen                    Tue 02 Dec 2008 06:57:09 AM CST
Last Seen                     Tue 02 Dec 2008 06:57:09 AM CST
Local ID                      c049e765-9d3b-4384-927a-19797fb78d8d
Line Numbers                  

Raw Audit Messages            

node=riohigh type=AVC msg=audit(1228222629.565:217): avc:  denied  { read } for  pid=4625
comm="npviewer.bin" name="pulse-shm-4180703699" dev=tmpfs ino=36988
scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:tmpfs_t:s0 tclass=file

node=riohigh type=SYSCALL msg=audit(1228222629.565:217): arch=40000003 syscall=5
success=no exit=-13 a0=bfda08d0 a1=a0000 a2=0 a3=bfda08d0 items=0 ppid=4427 pid=4625
auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500
tty=(none) ses=13 comm="npviewer.bin"
exe="/usr/lib/nspluginwrapper/npviewer.bin"
subj=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 key=(null)


I try the fix and i get:

[olivares@riohigh ~]$ su -
Password: 
[root@riohigh ~]# restorecon -v './pulse-shm-4180703699'

restorecon:  stat error on ./pulse-shm-4180703699:  No such file or directory
[root@riohigh ~]# 

Thanks,

Antonio

[Daniel J Walsh]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Antonio Olivares wrote:
>  Dear fellow selinux experts,
>  
>  Net avc for npviewer :(  
>  
>  
>  Summary:
>  
>  SELinux is preventing npviewer.bin (nsplugin_t) "read" to
> ./pulse-shm-4180703699
>  (tmpfs_t).
>  
>  Detailed Description:
>  
>  SELinux denied access requested by npviewer.bin. It is not expected that this
>  access is required by npviewer.bin 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:
>  
>  Sometimes labeling problems can cause SELinux denials. You could try to restore
>  the default system file context for ./pulse-shm-4180703699,
>  
>  restorecon -v './pulse-shm-4180703699'
>  
>  If this does not work, there is currently no automatic way to allow this access.
>  Instead, you can generate a local policy module to allow this access - see FAQ
>  (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable
>  SELinux protection altogether. Disabling SELinux protection is not recommended.
>  Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
>  against this package.
>  
>  Additional Information:
>  
>  Source Context                unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c102
>                                3
>  Target Context                unconfined_u:object_r:tmpfs_t:s0
>  Target Objects                ./pulse-shm-4180703699 [ file ]
>  Source                        npviewer.bin
>  Source Path                   /usr/lib/nspluginwrapper/npviewer.bin
>  Port                          <Unknown>
>  Host                          riohigh
>  Source RPM Packages           nspluginwrapper-1.1.4-1.fc11
>  Target RPM Packages           
>  Policy RPM                    selinux-policy-3.5.13-18.fc10
>  Selinux Enabled               True
>  Policy Type                   targeted
>  MLS Enabled                   True
>  Enforcing Mode                Enforcing
>  Plugin Name                   catchall_file
>  Host Name                     riohigh
>  Platform                      Linux riohigh 2.6.27.5-117.fc10.i686 #1 SMP Tue
>                                Nov 18 12:19:59 EST 2008 i686 athlon
>  Alert Count                   1
>  First Seen                    Tue 02 Dec 2008 06:57:09 AM CST
>  Last Seen                     Tue 02 Dec 2008 06:57:09 AM CST
>  Local ID                      c049e765-9d3b-4384-927a-19797fb78d8d
>  Line Numbers                  
>  
>  Raw Audit Messages            
>  
>  node=riohigh type=AVC msg=audit(1228222629.565:217): avc:  denied  { read } for  pid=4625
> comm="npviewer.bin" name="pulse-shm-4180703699" dev=tmpfs ino=36988
> scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:tmpfs_t:s0 tclass=file
>  
>  node=riohigh type=SYSCALL msg=audit(1228222629.565:217): arch=40000003 syscall=5
> success=no exit=-13 a0=bfda08d0 a1=a0000 a2=0 a3=bfda08d0 items=0 ppid=4427 pid=4625
> auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500
> tty=(none) ses=13 comm="npviewer.bin"
> exe="/usr/lib/nspluginwrapper/npviewer.bin"
> subj=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 key=(null)
>  
>  
>  I try the fix and i get:
>  
>  [olivares@riohigh ~]$ su -
>  Password: 
>  [root@riohigh ~]# restorecon -v './pulse-shm-4180703699'
>  
>  restorecon:  stat error on ./pulse-shm-4180703699:  No such file or directory
>  [root@riohigh ~]# 
>  
>  Thanks,
>  
>  Antonio 
>  
>  
>        
>  
>  --
>  fedora-selinux-list mailing list
>  fedora-selinux-list(a)redhat.com
>  https://www.redhat.com/mailman/listinfo/fedora-selinux-list 
This one has me
baffled, on how you created this file.  This file should
be labeled user_tmpfs_t in which case nsplugin would have been allowed
to use it,  But for some reason it got created with the incorrect context.

Could you try to upgrade to the latest policy and see if this still happens.

I tried an experiment as the unconfined user

# mount -t tmpfs_t /dev/shm /mnt
# ls -ldZ /mnt/redhat/
drwxrwxrwt  root root staff_u:object_r:tmpfs_t:s0      /mnt/redhat/
# touch /mnt/redhat/test
# ls -lZ /mnt/redhat/test
- -rw-r--r--  root root staff_u:object_r:user_tmpfs_t:s0 /mnt/redhat/test

Which is what pulseaudio should have done.


Could you check what context pulseaudio is running with

# ps -eZ | grep pulse

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