firefox and selinux alert, here's one maybe filed two or three times :(

[Antonio Olivares]

https://bugzilla.redhat.com/show_bug.cgi?id=522917


Summary:

SELinux is preventing /usr/lib/firefox-3.5.3/firefox from changing a writable
memory segment executable.

Detailed Description:

[firefox has a permissive type (unconfined_t). This access was not denied.]

The firefox 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 firefox 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 against this package.

Allowing Access:

If you trust firefox to run correctly, you can change the context of the
executable to execmem_exec_t. "chcon -t execmem_exec_t
'/usr/lib/firefox-3.5.3/firefox'". 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 '/usr/lib/firefox-3.5.3/firefox'"

Fix Command:

chcon -t execmem_exec_t '/usr/lib/firefox-3.5.3/firefox'

Additional Information:

Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                None [ process ]
Source                        firefox
Source Path                   /usr/lib/firefox-3.5.3/firefox
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           firefox-3.5.3-1.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.31-3.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   allow_execmem
Host Name                     (removed)
Platform                      Linux localhost.localdomain 2.6.31-2.fc12.i686 #1
                              SMP Thu Sep 10 00:41:03 EDT 2009 i686 i686
Alert Count                   1
First Seen                    Sun 13 Sep 2009 11:47:14 AM CDT
Last Seen                     Sun 13 Sep 2009 11:47:14 AM CDT
Local ID                      1c10f973-7768-4807-9482-d77739f533a2
Line Numbers                  

Raw Audit Messages            

node=localhost.localdomain type=AVC msg=audit(1252860434.198:37): avc:  denied  { execmem
} for  pid=1910 comm="firefox"
scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process

node=localhost.localdomain type=SYSCALL msg=audit(1252860434.198:37): arch=40000003
syscall=192 success=yes exit=1601536 a0=0 a1=1000 a2=7 a3=22 items=0 ppid=1898 pid=1910
auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500
tty=(none) ses=1 comm="firefox" exe="/usr/lib/firefox-3.5.3/firefox"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)


Regards,

Antonio

[Dominick Grift]

On Sun, Sep 13, 2009 at 09:53:49AM -0700, Antonio Olivares wrote:
This is actually a bug in firefox i believe. However no access is actually denied. It was
just reporting that normally it would have been denied. The solution that is suggested by
setroubleshoot would have worked if it was needed (it isnt because the action was allowed
in this case)

So the issue is known (waiting for a fix from mozilla)
In the meantime the access is allowed by SELinux but logged.
if you want to get rid of the "warning" you could temporarily label

chcon -t execmem_exec_t /usr/lib/firefox-3.5.3/firefox

Just have to wait for a fix for this known issue`:wq

>  https://bugzilla.redhat.com/show_bug.cgi?id=522917
>  
>  
>  Summary:
>  
>  SELinux is preventing /usr/lib/firefox-3.5.3/firefox from changing a writable
>  memory segment executable.
>  
>  Detailed Description:
>  
>  [firefox has a permissive type (unconfined_t). This access was not denied.]
>  
>  The firefox 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 firefox 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 against this package.
>  
>  Allowing Access:
>  
>  If you trust firefox to run correctly, you can change the context of the
>  executable to execmem_exec_t. "chcon -t execmem_exec_t
>  '/usr/lib/firefox-3.5.3/firefox'". 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 '/usr/lib/firefox-3.5.3/firefox'"
>  
>  Fix Command:
>  
>  chcon -t execmem_exec_t '/usr/lib/firefox-3.5.3/firefox'
>  
>  Additional Information:
>  
>  Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
>                                023
>  Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
>                                023
>  Target Objects                None [ process ]
>  Source                        firefox
>  Source Path                   /usr/lib/firefox-3.5.3/firefox
>  Port                          <Unknown>
>  Host                          (removed)
>  Source RPM Packages           firefox-3.5.3-1.fc12
>  Target RPM Packages           
>  Policy RPM                    selinux-policy-3.6.31-3.fc12
>  Selinux Enabled               True
>  Policy Type                   targeted
>  MLS Enabled                   True
>  Enforcing Mode                Enforcing
>  Plugin Name                   allow_execmem
>  Host Name                     (removed)
>  Platform                      Linux localhost.localdomain 2.6.31-2.fc12.i686 #1
>                                SMP Thu Sep 10 00:41:03 EDT 2009 i686 i686
>  Alert Count                   1
>  First Seen                    Sun 13 Sep 2009 11:47:14 AM CDT
>  Last Seen                     Sun 13 Sep 2009 11:47:14 AM CDT
>  Local ID                      1c10f973-7768-4807-9482-d77739f533a2
>  Line Numbers                  
>  
>  Raw Audit Messages            
>  
>  node=localhost.localdomain type=AVC msg=audit(1252860434.198:37): avc:  denied  { execmem
> } for  pid=1910 comm="firefox"
> scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process
>  
>  node=localhost.localdomain type=SYSCALL msg=audit(1252860434.198:37): arch=40000003
> syscall=192 success=yes exit=1601536 a0=0 a1=1000 a2=7 a3=22 items=0 ppid=1898 pid=1910
> auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500
> tty=(none) ses=1 comm="firefox" exe="/usr/lib/firefox-3.5.3/firefox"
> subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
>  
>  
>  Regards,
>  
>  Antonio 
>  
>  
>        
>  
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