Attachment 294413 Details for Bug 432098 – mixer

mixer

selinux_alert_mixer.txt (text/plain), 3.66 KB, created by Valent Turkovic on 2008-02-08 20:23:56 UTC

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Creator: Valent Turkovic

Created: 2008-02-08 20:23:56 UTC

Size: 3.66 KB

patch

obsolete

>
>Summary:
>
>SELinux is preventing mixer_applet2 from making the program stack executable.
>
>Detailed Description:
>
>The mixer_applet2 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 mixer_applet2 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
>mixer_applet2 to run correctly, you can change the context of the executable to
>unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t
>'/usr/libexec/mixer_applet2'" 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/libexec/mixer_applet2'"
>
>The following command will allow this access:
>
>chcon -t unconfined_execmem_exec_t '/usr/libexec/mixer_applet2'
>
>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                        totem-video-thu
>Source Path                   /usr/bin/totem-video-thumbnailer
>Port                          <Unknown>
>Host                          localhost.localdomain
>Source RPM Packages           gnome-applets-2.21.4-5.fc9
>Target RPM Packages           
>Policy RPM                    selinux-policy-3.2.6-5.fc9
>Selinux Enabled               True
>Policy Type                   targeted
>MLS Enabled                   True
>Enforcing Mode                Enforcing
>Plugin Name                   allow_execstack
>Host Name                     localhost.localdomain
>Platform                      Linux localhost.localdomain 2.6.24-17.fc9 #1 SMP
>                              Mon Feb 4 19:02:27 EST 2008 i686 i686
>Alert Count                   15
>First Seen                    Thu 07 Feb 2008 08:11:46 PM CET
>Last Seen                     Fri 08 Feb 2008 06:19:16 PM CET
>Local ID                      b0de7823-b749-4eb1-af58-c516e92ea79c
>Line Numbers                  
>
>Raw Audit Messages            
>
>host=localhost.localdomain type=AVC msg=audit(1202491156.709:28): avc:  denied  { execstack } for  pid=2874 comm="mixer_applet2" 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(1202491156.709:28): arch=40000003 syscall=125 success=no exit=-13 a0=bfc89000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=2861 pid=2874 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) comm="mixer_applet2" exe="/usr/libexec/mixer_applet2" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
>
>

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Attachments on bug 432098: 294413