Bug 524762
| Summary: | setroubleshoot: SELinux is preventing /usr/bin/yelp "execmem" access on <Unknown>. | |||
|---|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Matthias Hölzl <tc> | |
| Component: | yelp | Assignee: | Matthew Barnes <mbarnes> | |
| Status: | CLOSED DUPLICATE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | |
| Severity: | medium | Docs Contact: | ||
| Priority: | low | |||
| Version: | rawhide | CC: | atorkhov, dwalsh, jkubin, mbarnes, mgrepl | |
| Target Milestone: | --- | |||
| Target Release: | --- | |||
| Hardware: | i386 | |||
| OS: | Linux | |||
| Whiteboard: | setroubleshoot_trace_hash:853161d471c13af19cd6c69dbdc79a36f31d258a885eabc50f676eed6d42a29b | |||
| Fixed In Version: | Doc Type: | Bug Fix | ||
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 524852 (view as bug list) | Environment: | ||
| Last Closed: | 2009-10-27 23:42:17 UTC | Type: | --- | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
| Bug Depends On: | ||||
| Bug Blocks: | 524852 | |||
Getting similar avcs from liferea:
node=rawhide.tortilla.ru type=AVC msg=audit(1253617043.92:245): avc: denied { execmem } for pid=12729 comm="liferea" 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=rawhide.tortilla.ru type=SYSCALL msg=audit(1253617043.92:245): arch=c000003e syscall=9 success=no exit=-13 a0=0 a1=4000 a2=5 a3=22 items=0 ppid=1 pid=12729 auid=502 uid=502 gid=502 euid=502 suid=502 fsuid=502 egid=502 sgid=502 fsgid=502 tty=(none) ses=1 comm="liferea" exe="/usr/bin/liferea" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
yelp should not need execmem privs. Neither should liferea, you can open a bugzilla on that package. Are these both clean installs. Did you install any additional "codecs"? In my case this is absolutely clean install - no packages from other repositories. Oh, and this avc for liferea is happening on display of rss item page - may be it and yelp both use same library for displaying html which should have execmem? You mean should not need execmem :^) I did a clean install from the snapshot 3 Live CD and then installed additional packages from the rawhide repository, but nothing from any third party repository. How do I find out the relevant codec packages? The obvious searches result in [tc@raven ~]$ yum list gstreamer-plugins* Loaded plugins: presto, refresh-packagekit Installed Packages gstreamer-plugins-base.i686 0.10.24-2.fc12 @rawhide gstreamer-plugins-flumpegdemux.i686 0.10.15-7.fc12 @rawhide gstreamer-plugins-good.i686 0.10.16-1.fc12 @rawhide Available Packages gstreamer-plugins-base-devel.i686 0.10.24-2.fc12 rawhide gstreamer-plugins-good-devel.i686 0.10.16-1.fc12 rawhide gstreamer-plugins-schroedinger.i586 1.0.7-1.fc12 rawhide [tc@raven ~]$ yum list *codec* Loaded plugins: presto, refresh-packagekit Installed Packages jakarta-commons-codec.i686 1.3-11.4.fc12 @rawhide Available Packages grfcodec.i686 0.9.11-0.4.r2177.fc12 rawhide jakarta-commons-codec-javadoc.i686 1.3-11.4.fc12 rawhide [tc@raven ~]$ yum list *xine* *xmms* Loaded plugins: presto, refresh-packagekit Installed Packages libXinerama.i686 1.0.99.1-1.fc12 @rawhide libXinerama-devel.i686 1.0.99.1-1.fc12 @rawhide Available Packages [many...] I did not reformat the home partition, so in theory yelp might access something there. However, I can find nothing obviously suspicious, so pointers to "dangerous" directories would be welcome. The .gnome2/yelp file contains only [Geometry] width=932 height=844 In case of liferea this is an issue with webkitgtk - see bug 516057. This could be same issue with yelp too. Does fedora yelp use webkitgtk? It doesn't look like that to me: [tc@raven ~]$ ldd /usr/bin/yelp | grep webkit [tc@raven ~]$ Looking at mmaps for liferea process, seems it does: # grep webkit /proc/17554/maps 312fc00000-3130c7e000 r-xp 00000000 fd:04 150913 /usr/lib64/libwebkit-1.0.so.2.10.0 3130c7e000-3130e7e000 ---p 0107e000 fd:04 150913 /usr/lib64/libwebkit-1.0.so.2.10.0 3130e7e000-3130f96000 rw-p 0107e000 fd:04 150913 /usr/lib64/libwebkit-1.0.so.2.10.0 7f841a545000-7f841a549000 r--p 00000000 fd:04 35585 /usr/share/locale/ru/LC_MESSAGES/webkit.mo *** This bug has been marked as a duplicate of bug 507023 *** |
The following was filed automatically by setroubleshoot: Summary: SELinux is preventing /usr/bin/yelp "execmem" access on <Unknown>. Detailed Description: [SELinux is in permissive mode. This access was not denied.] SELinux denied access requested by gnome-help. The current boolean settings do not allow this access. If you have not setup gnome-help to require this access this may signal an intrusion attempt. If you do intend this access you need to change the booleans on this system to allow the access. Allowing Access: One of the following booleans is set incorrectly: allow_execstack, allow_execmem Fix Command: Choose one of the following to allow access: Allow unconfined executables to make their stack executable. This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla") # setsebool -P allow_execstack 1 Allow unconfined executables to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla") # setsebool -P allow_execmem 1 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 gnome-help Source Path /usr/bin/yelp Port <Unknown> Host (removed) Source RPM Packages yelp-2.27.5-1.fc12 Target RPM Packages Policy RPM selinux-policy-3.6.32-7.fc12 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Permissive Plugin Name catchall_boolean Host Name (removed) Platform Linux (removed) 2.6.31-33.fc12.i686 #1 SMP Thu Sep 17 15:56:11 EDT 2009 i686 athlon Alert Count 1 First Seen Tue 22 Sep 2009 07:33:50 AM CEST Last Seen Tue 22 Sep 2009 07:33:50 AM CEST Local ID 530b9729-f87f-4f6a-9f69-078c1dbfd05a Line Numbers Raw Audit Messages node=(removed) type=AVC msg=audit(1253597630.343:44): avc: denied { execmem } for pid=7499 comm="gnome-help" 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(1253597630.343:44): arch=40000003 syscall=192 success=yes exit=2404352 a0=0 a1=1000 a2=7 a3=22 items=0 ppid=1 pid=7499 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="gnome-help" exe="/usr/bin/yelp" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) audit2allow suggests: #============= unconfined_t ============== allow unconfined_t self:process execmem;