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Red Hat Bugzilla – Attachment 262451 Details for
Bug 388671
SELinux is preventing firefox-bin stack executable.
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selinux alert executable stack
selinux_alert.txt (text/plain), 3.21 KB, created by
Peter Harmsen
on 2007-11-17 18:56:20 UTC
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Description:
selinux alert executable stack
Filename:
MIME Type:
Creator:
Peter Harmsen
Created:
2007-11-17 18:56:20 UTC
Size:
3.21 KB
patch
obsolete
>Summary > SELinux is preventing /usr/lib/firefox-2.0.0.9/firefox-bin from making the > program stack executable. > >Detailed Description > The /usr/lib/firefox-2.0.0.9/firefox-bin 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 http://people.redhat.com/drepper/selinux-mem.html web > page explains how to remove this requirement. If /usr/lib/firefox-2.0.0.9 > /firefox-bin 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 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 /usr/lib/firefox-2.0.0.9/firefox-bin 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-2.0.0.9/firefox-bin" 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-2.0.0.9/firefox-bin" > > The following command will allow this access: > chcon -t unconfined_execmem_exec_t /usr/lib/firefox-2.0.0.9/firefox-bin > >Additional Information > >Source Context system_u:system_r:unconfined_t:s0 >Target Context system_u:system_r:unconfined_t:s0 >Target Objects None [ process ] >Affected RPM Packages firefox-2.0.0.9-1.fc9 [application] >Policy RPM selinux-policy-3.0.8-53.fc8 >Selinux Enabled True >Policy Type targeted >MLS Enabled True >Enforcing Mode Enforcing >Plugin Name plugins.allow_execstack >Host Name localhost.localdomain >Platform Linux localhost.localdomain 2.6.23.1-49.fc8PAE #1 > SMP Thu Nov 8 21:33:13 EST 2007 i686 athlon >Alert Count 18 >First Seen Sat 17 Nov 2007 09:13:07 AM CET >Last Seen Sat 17 Nov 2007 07:44:28 PM CET >Local ID 75ead45e-9269-4b29-a53c-95c58e5c4274 >Line Numbers > >Raw Audit Messages > >avc: denied { execstack } for comm=firefox-bin egid=500 euid=500 >exe=/usr/lib/firefox-2.0.0.9/firefox-bin exit=-13 fsgid=500 fsuid=500 gid=500 >items=0 pid=13905 scontext=system_u:system_r:unconfined_t:s0 sgid=500 >subj=system_u:system_r:unconfined_t:s0 suid=500 tclass=process >tcontext=system_u:system_r:unconfined_t:s0 tty=(none) uid=500 >
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bug 388671
: 262451