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The following was filed automatically by setroubleshoot: Summary: SELinux is preventing /usr/lib/firefox-3.5.3/firefox from changing a writable memory segment executable. Detailed Description: 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 mutter Source Path /usr/bin/mutter Port <Unknown> Host (removed) Source RPM Packages firefox-3.5.3-1.fc12 Target RPM Packages Policy RPM selinux-policy-3.6.31-5.fc12 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execmem Host Name (removed) Platform Linux (removed) 2.6.31-14.fc12.i686 #1 SMP Tue Sep 15 04:04:35 EDT 2009 i686 i686 Alert Count 45 First Seen Sat 12 Sep 2009 06:49:32 PM CST Last Seen Thu 17 Sep 2009 08:24:38 PM CST Local ID c2d2ccc9-36c4-4a1e-9e81-a855c650000d Line Numbers Raw Audit Messages node=(removed) type=AVC msg=audit(1253190278.880:25): avc: denied { execmem } for pid=1871 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=(removed) type=SYSCALL msg=audit(1253190278.880:25): arch=40000003 syscall=192 success=no exit=-13 a0=0 a1=2000 a2=7 a3=22 items=0 ppid=1856 pid=1871 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) audit2allow suggests: #============= unconfined_t ============== allow unconfined_t self:process execmem;
Added a new plugin that will tell you the following. The firefox application attempted to change the access protection of memory (e.g., allocated using malloc). This is a potential security problem. Firefox is probably not the problem here ,but one of its plugins. You could remove the plugin and the app would no longer require the access. If you figure out which plugin is causing the access request, please open a bug report on the plugin. Allowing Access: There are two ways to fix this problem, you can install the nsspluginwrapper package, which will cause firefox to run its plugins under a separate process. This process will allow the execmem access. This is the safest choice. You could also turn off the allow_unconfined_nsplugin_transition boolean. setsebool -P allow_unconfined_nsplugin_transition=0 Fix Command: yum install nspluginwrapper BTW DO YOU HAVE FLASHPLUGIN installed or any other random plugin installed.
I'm also having this problem. While Daniel's suggestion does fix it, I don't the problem really lies in any plugin, even though I do have the flashplugin installed. Here's the sequence of what I tried that makes me think this: # yum install nspluginwrapper # setsebool -P allow_unconfined_nsplugin_transition=0 OK, good, things still work here. # yum remove nspluginwrapper Firefox still works! Hmm... # setsebool -P allow_unconfined_nsplugin_transition=1 Ah, now Firefox breaks again. Let's try something else. $ firefox -safe-mode Works fine! (disable all addons & plugins) Firefox doesn't work. Seems wrong to blame the plugins now... Add to prefs.js: user_pref("javascript.options.jit.content", false); It works! (enable all addons & plugins) It works! So, it seems to me that the true culprit is the javascript JIT. Either turning off that sebool or disabling the JIT will both solve the problem, but I'm curious what has changed to make this a problem...
I take it back -- the JIT seemed to be the problem, but I've since gotten other errors that seem to indicate that the nsplugin stuff is still needed. Sorry for the noise...
522606Fixed in selinux-policy-3.6.32-29.fc12.noarch