Two alerts from selinux Summary: SELinux is preventing nspluginviewer from changing a writable memory segment executable. Detailed Description: The nspluginviewer 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 nspluginviewer 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: If you trust nspluginviewer to run correctly, you can change the context of the executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t '/usr/bin/nspluginviewer'". 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/nspluginviewer'" Fix Command: chcon -t unconfined_execmem_exec_t '/usr/bin/nspluginviewer' 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 nspluginviewer Source Path /usr/bin/nspluginviewer Port <Unknown> Host localhost.localdomain Source RPM Packages kdebase-4.1.0-1.fc10 Target RPM Packages Policy RPM selinux-policy-3.5.1-4.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execmem Host Name localhost.localdomain Platform Linux localhost.localdomain 2.6.26.1 #1 SMP Sat Aug 2 21:36:01 CDT 2008 i686 i686 Alert Count 29 First Seen Sun 03 Aug 2008 12:55:21 PM CDT Last Seen Sun 03 Aug 2008 12:55:21 PM CDT Local ID 865503d3-baab-4dcd-adc0-47f8fff6ade6 Line Numbers Raw Audit Messages host=localhost.localdomain type=AVC msg=audit(1217786121.365:53): avc: denied { execmem } for pid=3262 comm="nspluginviewer" 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(1217786121.365:53): arch=40000003 syscall=125 success=no exit=-13 a0=b1aaa000 a1=1000 a2=5 a3=bfa32acc items=0 ppid=3222 pid=3262 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="nspluginviewer" exe="/usr/bin/nspluginviewer" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) I have recently installed xine(xine-lib-1.1.15 and xine-ui from source) and I got this one immediately following: What should I do? Should I just apply the fix and move on? Summary: SELinux is preventing xine from making the program stack executable. Detailed Description: The xine 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 xine 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 xine to run correctly, you can change the context of the executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t '/usr/bin/xine'" 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/xine'" Fix Command: chcon -t unconfined_execmem_exec_t '/usr/bin/xine' 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 nspluginscan Source Path /usr/bin/nspluginscan Port <Unknown> Host localhost.localdomain Source RPM Packages xine-0.99.5-1.lvn8 Target RPM Packages Policy RPM selinux-policy-3.5.1-4.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execstack Host Name localhost.localdomain Platform Linux localhost.localdomain 2.6.27-0.244.rc2.git1.fc10.i686 #1 SMP Fri Aug 8 13:26:20 EDT 2008 i686 i686 Alert Count 4 First Seen Mon 28 Jul 2008 10:50:50 PM CDT Last Seen Tue 19 Aug 2008 08:01:26 AM CDT Local ID d1193200-ba21-44ee-bdf0-5b24a80cdb04 Line Numbers Raw Audit Messages host=localhost.localdomain type=AVC msg=audit(1219150886.174:61): avc: denied { execstack } for pid=18915 comm="xine" 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(1219150886.174:61): arch=40000003 syscall=125 success=no exit=-13 a0=bfaed000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=4154 pid=18915 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts4 ses=1 comm="xine" exe="/usr/bin/xine" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) Thanks, Antonio -- fedora-selinux-list mailing list fedora-selinux-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-selinux-list
