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-   -   firefox and selinux (http://www.linux-archive.org/fedora-selinux-support/51368-firefox-selinux.html)

Antonio Olivares 02-09-2008 05:45 PM

firefox and selinux
 
Dear all,

I have set settroubleshoot to allow the following:
chcon -t unconfined_execmem_exec_t
'/usr/lib/firefox-3.0b4pre/firefox'

But it is happening again, I do not understand why I
need to do it multiple of times. I see a pattern
occuring: I have filed a bug report against
firefox-b3

https://bugzilla.redhat.com/show_bug.cgi?id=432198

I hope that firefox and selinux start to work together
and not against each other. :)

Summary:

SELinux is preventing firefox from making the program
stack executable.

Detailed Description:

The firefox application attempted to make its stack
executable. This is a
potential security problem. This should never ever be
necessary. Stack memory is
not executable on most OSes these days and this will
not change. Executable
stack memory is one of the biggest security problems.
An execstack error might
in fact be most likely raised by malicious code.
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
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.

Allowing Access:

Sometimes a library is accidentally marked with the
execstack flag, if you find
a library with this flag you can clear it with the
execstack -c LIBRARY_PATH.
Then retry your application. If the app continues to
not work, you can turn the
flag back on with execstack -s LIBRARY_PATH.
Otherwise, if you trust firefox to
run correctly, you can change the context of the
executable to
unconfined_execmem_exec_t. "chcon -t
unconfined_execmem_exec_t
'/usr/lib/firefox-3.0b4pre/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 unconfined_execmem_exec_t
'/usr/lib/firefox-3.0b4pre/firefox'"

The following command will allow this access:

chcon -t unconfined_execmem_exec_t
'/usr/lib/firefox-3.0b4pre/firefox'

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 firefox
Source Path
/usr/lib/firefox-3.0b3pre/firefox
Port <Unknown>
Host localhost
Source RPM Packages
firefox-3.0-0.beta2.16.nightly20080206.fc9
Target RPM Packages
Policy RPM
selinux-policy-3.2.7-1.fc9
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Enforcing
Plugin Name allow_execstack
Host Name localhost
Platform Linux localhost
2.6.24-23.fc9 #1 SMP Wed Feb 6
11:36:31 EST 2008 i686
athlon
Alert Count 11
First Seen Fri 01 Feb 2008 05:08:54
PM CST
Last Seen Sat 09 Feb 2008 12:35:06
PM CST
Local ID
c4806f30-a6dc-43b0-8901-5531075795f7
Line Numbers

Raw Audit Messages

host=localhost type=AVC msg=audit(1202582106.621:28):
avc: denied { execstack } for pid=9246
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

host=localhost type=SYSCALL
msg=audit(1202582106.621:28): arch=40000003
syscall=125 success=no exit=-13 a0=bfa71000 a1=1000
a2=1000007 a3=fffff000 items=0 ppid=9232 pid=9246
auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500
egid=500 sgid=500 fsgid=500 tty=(none) comm="firefox"
exe="/usr/lib/firefox-3.0b4pre/firefox"
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
key=(null)



Regards,

Antonio


__________________________________________________ __________________________________
Never miss a thing. Make Yahoo your home page.
http://www.yahoo.com/r/hs

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Daniel J Walsh 02-12-2008 01:17 PM

firefox and selinux
 
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Antonio Olivares wrote:
> Dear all,
>
> I have set settroubleshoot to allow the following:
> chcon -t unconfined_execmem_exec_t
> '/usr/lib/firefox-3.0b4pre/firefox'
>
> But it is happening again, I do not understand why I
> need to do it multiple of times. I see a pattern
> occuring: I have filed a bug report against
> firefox-b3
>
> https://bugzilla.redhat.com/show_bug.cgi?id=432198
>
> I hope that firefox and selinux start to work together
> and not against each other. :)
>
> Summary:
>
> SELinux is preventing firefox from making the program
> stack executable.
>
> Detailed Description:
>
> The firefox application attempted to make its stack
> executable. This is a
> potential security problem. This should never ever be
> necessary. Stack memory is
> not executable on most OSes these days and this will
> not change. Executable
> stack memory is one of the biggest security problems.
> An execstack error might
> in fact be most likely raised by malicious code.
> 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
> (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
> against this package.
>
> Allowing Access:
>
> Sometimes a library is accidentally marked with the
> execstack flag, if you find
> a library with this flag you can clear it with the
> execstack -c LIBRARY_PATH.
> Then retry your application. If the app continues to
> not work, you can turn the
> flag back on with execstack -s LIBRARY_PATH.
> Otherwise, if you trust firefox to
> run correctly, you can change the context of the
> executable to
> unconfined_execmem_exec_t. "chcon -t
> unconfined_execmem_exec_t
> '/usr/lib/firefox-3.0b4pre/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 unconfined_execmem_exec_t
> '/usr/lib/firefox-3.0b4pre/firefox'"
>
> The following command will allow this access:
>
> chcon -t unconfined_execmem_exec_t
> '/usr/lib/firefox-3.0b4pre/firefox'
>
> 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 firefox
> Source Path
> /usr/lib/firefox-3.0b3pre/firefox
> Port <Unknown>
> Host localhost
> Source RPM Packages
> firefox-3.0-0.beta2.16.nightly20080206.fc9
> Target RPM Packages
> Policy RPM
> selinux-policy-3.2.7-1.fc9
> Selinux Enabled True
> Policy Type targeted
> MLS Enabled True
> Enforcing Mode Enforcing
> Plugin Name allow_execstack
> Host Name localhost
> Platform Linux localhost
> 2.6.24-23.fc9 #1 SMP Wed Feb 6
> 11:36:31 EST 2008 i686
> athlon
> Alert Count 11
> First Seen Fri 01 Feb 2008 05:08:54
> PM CST
> Last Seen Sat 09 Feb 2008 12:35:06
> PM CST
> Local ID
> c4806f30-a6dc-43b0-8901-5531075795f7
> Line Numbers
>
> Raw Audit Messages
>
> host=localhost type=AVC msg=audit(1202582106.621:28):
> avc: denied { execstack } for pid=9246
> 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
>
> host=localhost type=SYSCALL
> msg=audit(1202582106.621:28): arch=40000003
> syscall=125 success=no exit=-13 a0=bfa71000 a1=1000
> a2=1000007 a3=fffff000 items=0 ppid=9232 pid=9246
> auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500
> egid=500 sgid=500 fsgid=500 tty=(none) comm="firefox"
> exe="/usr/lib/firefox-3.0b4pre/firefox"
> subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> key=(null)
>
>
>
> Regards,
>
> Antonio
>
>
> __________________________________________________ __________________________________
> Never miss a thing. Make Yahoo your home page.
> http://www.yahoo.com/r/hs
>

chcon -t unconfined_execmem_exec_t
'/usr/lib/firefox-3.0b4pre/firefox'

This will only survive until the next relabel. selinux-policy update
can trigger partial relabels.

# semanage fcontext -a -t unconfined_execmem_exec_t
'/usr/lib/firefox-3.0b4pre/firefox'
# restorecon '/usr/lib/firefox-3.0b4pre/firefox'

Would set the file systems default labeling for firefox and make it
survive a relabel.

As other replies have indicated, this problem is probably a bad plugin.
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