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Go Back   Linux Archive > Redhat > Fedora SELinux Support

 
 
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Old 08-03-2008, 05:59 PM
Antonio Olivares
 
Default SELinux is preventing nspluginviewer ....

Dear all,

Now I know why playing Penalty_Fever caused a problem. The following is clear evidence


Summary:

SELinux is preventing nspluginviewer from changing a writable memory segment
executable.

Detailed Description:

The nspluginviewer application attempted to change the access protection of
memory (e.g., allocated using malloc). This is a potential security problem.
Applications should not be doing this. Applications are sometimes coded
incorrectly and request this permission. The SELinux Memory Protection Tests
(http://people.redhat.com/drepper/selinux-mem.html) web page explains how to
remove this requirement. If nspluginviewer does not work and you need it to
work, you can configure SELinux temporarily to allow this access until the
application is fixed. Please file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package.

Allowing Access:

If you trust nspluginviewer to run correctly, you can change the context of the
executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t
'/usr/bin/nspluginviewer'". You must also change the default file context files
on the system in order to preserve them even on a full relabel. "semanage
fcontext -a -t unconfined_execmem_exec_t '/usr/bin/nspluginviewer'"

Fix Command:

chcon -t unconfined_execmem_exec_t '/usr/bin/nspluginviewer'

Additional Information:

Source Context unconfined_u:unconfined_r:unconfined_t:SystemLow-
SystemHigh
Target Context unconfined_u:unconfined_r:unconfined_t:SystemLow-
SystemHigh
Target Objects None [ process ]
Source nspluginviewer
Source Path /usr/bin/nspluginviewer
Port <Unknown>
Host localhost.localdomain
Source RPM Packages kdebase-4.1.0-1.fc10
Target RPM Packages
Policy RPM selinux-policy-3.5.1-4.fc10
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Enforcing
Plugin Name allow_execmem
Host Name localhost.localdomain
Platform Linux localhost.localdomain 2.6.26.1 #1 SMP Sat
Aug 2 21:36:01 CDT 2008 i686 i686
Alert Count 29
First Seen Sun 03 Aug 2008 12:55:21 PM CDT
Last Seen Sun 03 Aug 2008 12:55:21 PM CDT
Local ID 865503d3-baab-4dcd-adc0-47f8fff6ade6
Line Numbers

Raw Audit Messages

host=localhost.localdomain type=AVC msg=audit(1217786121.365:53): avc: denied { execmem } for pid=3262 comm="nspluginviewer" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process

host=localhost.localdomain type=SYSCALL msg=audit(1217786121.365:53): arch=40000003 syscall=125 success=no exit=-13 a0=b1aaa000 a1=1000 a2=5 a3=bfa32acc items=0 ppid=3222 pid=3262 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="nspluginviewer" exe="/usr/bin/nspluginviewer" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)


This was an old bug and it returns to bite back
Is anybody else also encountering this problem?

Regards,

Antonio




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