Bug 510950 - SELinux is preventing thunderbird-bin from changing a writable memory segment executable.
Summary: SELinux is preventing thunderbird-bin from changing a writable memory segment...
Status: CLOSED DUPLICATE of bug 512845
Alias: None
Product: Fedora
Classification: Fedora
Component: thunderbird
Version: 11
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Gecko Maintainer
QA Contact: Fedora Extras Quality Assurance
Keywords: SELinux
Depends On:
Blocks: F12Blocker, F12FinalBlocker
TreeView+ depends on / blocked
Reported: 2009-07-12 19:22 UTC by Edwin ten Brink
Modified: 2009-09-28 18:42 UTC (History)
5 users (show)

Clone Of:
Last Closed: 2009-09-28 18:42:59 UTC

Attachments (Terms of Use)

Description Edwin ten Brink 2009-07-12 19:22:24 UTC

SELinux is preventing thunderbird-bin from changing a writable memory segment

Detailed Description:

The thunderbird-bin 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 thunderbird-bin 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 thunderbird-bin to run correctly, you can change the context of the
executable to execmem_exec_t. "chcon -t execmem_exec_t
'/usr/lib/thunderbird-3.0b2/thunderbird-bin'". 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 execmem_exec_t

Fix Command:

chcon -t execmem_exec_t '/usr/lib/thunderbird-3.0b2/thunderbird-bin'

Additional Information:

Source Context                unconfined_u:unconfined_r:unconfined_t:s0
Target Context                unconfined_u:unconfined_r:unconfined_t:s0
Target Objects                None [ process ]
Source                        thunderbird-bin
Source Path                   /usr/lib/thunderbird-3.0b2/thunderbird-bin
Port                          <Unknown>
Host                          localhost.localdomain
Source RPM Packages           thunderbird-3.0-2.3.beta2.fc11
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.12-53.fc11
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   allow_execmem
Host Name                     localhost.localdomain
Platform                      Linux localhost.localdomain
                              #1 SMP Tue Jun 16 23:11:39 EDT 2009 i686 i686
Alert Count                   8
First Seen                    Sun 12 Jul 2009 08:49:33 PM CEST
Last Seen                     Sun 12 Jul 2009 08:49:51 PM CEST
Local ID                      5a6c7ebf-2a91-4450-bc06-11183ac4a95d
Line Numbers                  

Raw Audit Messages            

node=localhost.localdomain type=AVC msg=audit(1247424591.357:31388): avc:  denied  { execmem } for  pid=2337 comm="thunderbird-bin" scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0 tclass=process

node=localhost.localdomain type=SYSCALL msg=audit(1247424591.357:31388): arch=40000003 syscall=192 success=no exit=-13 a0=0 a1=2000 a2=7 a3=22 items=0 ppid=2333 pid=2337 auid=500 uid=500 gid=100 euid=500 suid=500 fsuid=500 egid=100 sgid=100 fsgid=100 tty=(none) ses=1 comm="thunderbird-bin" exe="/usr/lib/thunderbird-3.0b2/thunderbird-bin" subj=unconfined_u:unconfined_r:unconfined_t:s0 key=(null)

Comment 1 Daniel Walsh 2009-07-14 14:47:36 UTC
Did you install some extension or plugin that might be causing thunderbird to need this access?

Comment 2 Edwin ten Brink 2009-07-14 19:02:32 UTC
The AVC denial came as soon as I upgraded from Fedora 10 to Fedora 11 via preupgrade. No new add-ons have been installed AFAIK.

The AVC denial comes (always times 4) as soon as I start Thunderbird and before the window is visualized, but does not seem to be occurring during normal use.

To be on the safe side, this is what I have installed on Thunderbird:
Dictionaries: German, Dutch
Themes: Default
Languages: A bunch that comes by default with Fedora
Plugins (which were actually installed for Firefox): Gecko Media Player 0.9.6, IcedTea Java Web Browser 1.5, Shockwave Flash 10.0 r22.

Comment 3 Daniel Walsh 2009-07-14 20:05:13 UTC
I would figure this is flash or java causing the problem.  You can mark thunderbird as execmem_exec_t as the tool suggest.

Comment 4 Daniel Walsh 2009-07-15 13:18:18 UTC
Cpardy is reporting seeing this on gnome-help browser also.  So I think this might be in a gnome library?

Comment 5 Matthias Clasen 2009-09-26 04:07:48 UTC
the commonality between yelp and thunderbird is that they both use xulrunner.

Comment 6 Christopher Aillon 2009-09-28 18:42:59 UTC

*** This bug has been marked as a duplicate of bug 512845 ***

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