Attachment 317610 Details for Bug 463781 – SELinux alert

SELinux alert

selinux_alert.txt (text/plain), 3.67 KB, created by Ben Gamari on 2008-09-24 17:38:58 UTC

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Creator: Ben Gamari

Created: 2008-09-24 17:38:58 UTC

Size: 3.67 KB

patch

obsolete

>
>Summary:
>
>SELinux is preventing totem-audio-pre from making the program stack executable.
>
>Detailed Description:
>
>The totem-audio-pre 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 totem-audio-pre 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
>totem-audio-pre to run correctly, you can change the context of the executable
>to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t
>'/usr/bin/totem-audio-preview'" 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/totem-audio-preview'"
>
>Fix Command:
>
>chcon -t unconfined_execmem_exec_t '/usr/bin/totem-audio-preview'
>
>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
>Source Path                   /usr/bin/totem
>Port                          <Unknown>
>Host                          mercury.localdomain
>Source RPM Packages           totem-2.23.91-3.fc10
>Target RPM Packages           
>Policy RPM                    selinux-policy-3.5.7-1.fc10
>Selinux Enabled               True
>Policy Type                   targeted
>MLS Enabled                   True
>Enforcing Mode                Enforcing
>Plugin Name                   allow_execstack
>Host Name                     mercury.localdomain
>Platform                      Linux mercury.localdomain
>                              2.6.27-0.329.rc6.git2.fc10.x86_64 #1 SMP Mon Sep
>                              15 19:10:22 EDT 2008 x86_64 x86_64
>Alert Count                   122
>First Seen                    Mon 25 Aug 2008 02:10:43 AM EDT
>Last Seen                     Wed 24 Sep 2008 01:03:40 PM EDT
>Local ID                      d5d8c85e-6ea0-47e2-9fdd-d16f7c2fb7aa
>Line Numbers                  
>
>Raw Audit Messages            
>
>node=mercury.localdomain type=AVC msg=audit(1222275820.166:80): avc:  denied  { execstack } for  pid=24900 comm="totem-audio-pre" 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=mercury.localdomain type=SYSCALL msg=audit(1222275820.166:80): arch=c000003e syscall=10 success=yes exit=0 a0=7fffdd054000 a1=1000 a2=1000007 a3=3193c20000 items=0 ppid=1 pid=24900 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="totem-audio-pre" exe="/usr/bin/totem-audio-preview" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
>
>

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Attachments on bug 463781: 317610