selinux October 2008

selinux@lists.fedoraproject.org

32 participants
46 discussions

Re: knotify4, NetworkManager (NetworkManager_t) "read write" unconfined_t., ..
by Antonio Olivares 24 Oct '08

24 Oct '08

--- On Fri, 10/24/08, Rex Dieter <rdieter(a)math.unl.edu> wrote: > From: Rex Dieter <rdieter(a)math.unl.edu> > Subject: Re: knotify4, NetworkManager (NetworkManager_t) "read write" unconfined_t., .. > To: fedora-test-list(a)redhat.com > Cc: fedora-selinux-list(a)redhat.com > Date: Friday, October 24, 2008, 2:48 PM > Antonio Olivares wrote: > > > > First one knotify is a bug that I have reported: > > > > https://bugzilla.redhat.com/show_bug.cgi?id=467210 > > > > but was closed because it was not an selinux bug, who > has the hot potato > > now? I keep seeing this on two of my three machines > :( Has someone else > > seen this? > > Not reproducible. Are you *sure* you have no 3rd-party > software installed? > > I ask, because I've seen quite a few spurious similar > reports, and they *all* were due to various 3rd-party crud > (usually nvidia binary X drivers). > Absolutely positively sure I have no third party stuff on both machines. How can I prove it if there is a way to prove it. It is strange that one of the three machines in which I run rawhide works perfectly well and have no complaints on knotify. Thanks, Antonio > > -- Rex > > > -- > fedora-test-list mailing list > fedora-test-list(a)redhat.com > To unsubscribe: > https://www.redhat.com/mailman/listinfo/fedora-test-list

1 0

Re: Question on SELinux‏
by Paul Howarth 24 Oct '08

24 Oct '08

On Sat, 18 Oct 2008 12:34:53 +0000 lionel ong <odin743(a)hotmail.com> wrote: > > > Date: Sat, 18 Oct 2008 13:25:59 +0100> From: paul(a)city-fan.org> To: > > odin743(a)hotmail.com> CC: fedora-selinux-list(a)redhat.com> Subject: > > Re: Question on SELinux‏> > On Sat, 18 Oct 2008 09:55:26 +0000> > > lionel ong <odin743(a)hotmail.com> wrote:> > > > Port 80 is the port > > that the websites firefox connects to use; if you> prevent firefox > > from connecting to websites on port 80 it's just not> going to work > > at all, unless you're trying to force it through a proxy> on a > > different port perhaps?> > Paul. > Hi, yes I understand that the firefox will fail to work, but I am > just trying out the things policies can do, it's ok if firefox fails. > Do you know how I could stop firefox from using Port 80 and uses some > other port? Regards, Lionel I've never done anything like that but I guess a good starting point would be xguest (see http://danwalsh.livejournal.com/14778.html) and tweaking policy from there. Paul.

2 1

Permissive domain how-to?
by Shintaro Fujiwara 24 Oct '08

24 Oct '08

Hi, I want to set permissive some domain as Mr Walsh gave us a hint, but when I tried to do that, [root@notepc ~]# semanage permissive -a zabbix_t /usr/sbin/semanage: Permission denied Another one was same result. Why ? -- http://intrajp.no-ip.com/ Home Page

3 3

Policy module building on rawhide
by Paul Howarth 22 Oct '08

22 Oct '08

My module builds are failing on rawhide: $ /usr/bin/make NAME=mls -f /usr/share/selinux/devel/Makefile cat: /selinux/mls: No such file or directory Compiling mls fastcgi module m4: tmp/fastcgi.mod.role: No such file or directory make: *** [tmp/fastcgi.mod] Error 1 The commands being run, according to "make -n" are: $ make -n NAME=mls -f /usr/share/selinux/devel/Makefile cat: /selinux/mls: No such file or directory echo "Compiling mls fastcgi module" test -d tmp || mkdir -p tmp m4 -D enable_mls -D distro_redhat -D hide_broken_symptoms -D mls_num_sens=16 -D mls_num_cats=1024 -D mcs_num_cats=1024 -s /usr/share/selinux/devel/include/support/all_perms.spt /usr/share/selinux/devel/include/support/file_patterns.spt /usr/share/selinux/devel/include/support/ipc_patterns.spt /usr/share/selinux/devel/include/support/loadable_module.spt /usr/share/selinux/devel/include/support/misc_macros.spt /usr/share/selinux/devel/include/support/misc_patterns.spt /usr/share/selinux/devel/include/support/mls_mcs_macros.spt /usr/share/selinux/devel/include/support/obj_perm_sets.spt tmp/all_interfaces.conf fastcgi.te tmp/fastcgi.mod.role > tmp/fastcgi.tmp /usr/bin/checkmodule -M -m tmp/fastcgi.tmp -o tmp/fastcgi.mod m4 -D enable_mls -D distro_redhat -D hide_broken_symptoms -D mls_num_sens=16 -D mls_num_cats=1024 -D mcs_num_cats=1024 /usr/share/selinux/devel/include/support/all_perms.spt /usr/share/selinux/devel/include/support/file_patterns.spt /usr/share/selinux/devel/include/support/ipc_patterns.spt /usr/share/selinux/devel/include/support/loadable_module.spt /usr/share/selinux/devel/include/support/misc_macros.spt /usr/share/selinux/devel/include/support/misc_patterns.spt /usr/share/selinux/devel/include/support/mls_mcs_macros.spt /usr/share/selinux/devel/include/support/obj_perm_sets.spt fastcgi.fc > tmp/fastcgi.mod.fc echo "Creating mls fastcgi.pp policy package" /usr/bin/semodule_package -o fastcgi.pp -m tmp/fastcgi.mod -f tmp/fastcgi.mod.fc rm tmp/fastcgi.mod.fc tmp/fastcgi.mod I'm guessing the missing .mod.role file would have been created by the commented-out rule in /usr/share/selinux/devel/include/Makefile: tmp/%.mod: $(m4support) tmp/all_interfaces.conf %.te @$(EINFO) "Compiling $(NAME) $(basename $(@F)) module" @test -d $(@D) || mkdir -p $(@D) # $(call peruser-expansion,$(basename $(@F)),$@.role) $(verbose) $(M4) $(M4PARAM) -s $^ $@.role > $(@:.mod=.tmp) $(verbose) $(CHECKMODULE) -m $(@:.mod=.tmp) -o $@ Do I need to do something different for F10, or is this a bug? Paul.

2 2

Re: Contents of fedora-selinux-list Digest, Vol 56, Issue 19
by Antonio Olivares 21 Oct '08

21 Oct '08

--- On Tue, 10/21/08, fedora-selinux-list-request(a)redhat.com <fedora-selinux-list-request(a)redhat.com> wrote: > From: fedora-selinux-list-request(a)redhat.com <fedora-selinux-list-request(a)redhat.com> > Subject: fedora-selinux-list Digest, Vol 56, Issue 19 > To: fedora-selinux-list(a)redhat.com > Date: Tuesday, October 21, 2008, 9:00 AM > Send fedora-selinux-list mailing list submissions to > fedora-selinux-list(a)redhat.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.redhat.com/mailman/listinfo/fedora-selinux-list > or, via email, send a message with subject or body > 'help' to > fedora-selinux-list-request(a)redhat.com > > You can reach the person managing the list at > fedora-selinux-list-owner(a)redhat.com > > When replying, please edit your Subject line so it is more > specific > than "Re: Contents of fedora-selinux-list > Message: 2 > Date: Mon, 20 Oct 2008 13:57:08 -0400 > From: Daniel J Walsh <dwalsh(a)redhat.com> > Subject: Re: selinux is denying consolekit, hal?, ..., > To: olivares14031(a)yahoo.com > Cc: fedora-selinux-list(a)redhat.com > Message-ID: <48FCC674.9010209(a)redhat.com> > Content-Type: text/plain; charset=ISO-8859-1 > > https://www.redhat.com/mailman/listinfo/fedora-selinux-list > These should be filed against the kernel. These tools > should not > suddenly need sys_resource. I believe this is a kernel > bug. I will wait then because we just got a new kernel, and it would be a waste of time and resources to file against a kernel that is no longer there :( I hope that you and others won't get upset, unless the new kernel behaves the same way, then absolutely like absolute value of x |x| :) Thanks, > > > ------------------------------ > > Message: 3 > Date: Mon, 20 Oct 2008 14:31:53 -0500 > From: Rex Dieter <rdieter(a)math.unl.edu> > Subject: Re: selinux is denying consolekit, hal?, ..., > To: fedora-selinux-list(a)redhat.com > Message-ID: <gdimb9$jio$1(a)ger.gmane.org> > Content-Type: text/plain; charset=us-ascii > > Antonio Olivares wrote: > > > Dear fellow selinux experts, > > > > selinux is at it again, this time, setroubleshoot shot > out the warnings: > > Any 3rd-party software installed? Say, like a binary > X/kernel driver? :) Nope! Regular nv driver as comes default. I used to like testing nvidia drivers before, but none anymore as it is a hassle to have to build them everytime a new kernel comes out(yes I have heard of livna,and freshrpms and now rpmfusion), I do not want to go there yet. Thanks, Antonio > > -- Rex > > > > ------------------------------ > > -- > fedora-selinux-list mailing list > fedora-selinux-list(a)redhat.com > https://www.redhat.com/mailman/listinfo/fedora-selinux-list > > End of fedora-selinux-list Digest, Vol 56, Issue 19 > *************************************************** __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

1 0

selinux is denying consolekit, hal?, ...,
by Antonio Olivares 20 Oct '08

20 Oct '08

Dear fellow selinux experts, selinux is at it again, this time, setroubleshoot shot out the warnings: Summary: SELinux is preventing hal-acl-tool (hald_acl_t) "sys_resource" hald_acl_t. Detailed Description: SELinux denied access requested by hal-acl-tool. It is not expected that this access is required by hal-acl-tool and this access may signal an intrusion attempt. It is also possible that the specific version or configuration of the application is causing it to require additional access. Allowing Access: You can generate a local policy module to allow this access - see FAQ (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable SELinux protection altogether. Disabling SELinux protection is not recommended. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Additional Information: Source Context system_u:system_r:hald_acl_t:s0 Target Context system_u:system_r:hald_acl_t:s0 Target Objects None [ capability ] Source hal-acl-tool Source Path /usr/libexec/hal-acl-tool Port <Unknown> Host riohigh Source RPM Packages hal-0.5.12-3.20081013git.fc10 Target RPM Packages Policy RPM selinux-policy-3.5.13-1.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name riohigh Platform Linux riohigh 2.6.27.3-27.rc1.fc10.i686 #1 SMP Sat Oct 18 20:35:56 EDT 2008 i686 athlon Alert Count 25 First Seen Thu 16 Oct 2008 05:21:21 PM CDT Last Seen Mon 20 Oct 2008 07:22:37 AM CDT Local ID 2dda3b9b-7240-47c2-9865-4e1c1971771c Line Numbers Raw Audit Messages node=riohigh type=AVC msg=audit(1224505357.902:104): avc: denied { sys_resource } for pid=3200 comm="hal-acl-tool" capability=24 scontext=system_u:system_r:hald_acl_t:s0 tcontext=system_u:system_r:hald_acl_t:s0 tclass=capability node=riohigh type=SYSCALL msg=audit(1224505357.902:104): arch=40000003 syscall=4 success=yes exit=2132 a0=4 a1=b7f94000 a2=854 a3=854 items=0 ppid=1873 pid=3200 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="hal-acl-tool" exe="/usr/libexec/hal-acl-tool" subj=system_u:system_r:hald_acl_t:s0 key=(null) Summary: SELinux is preventing knotify4 from making the program stack executable. Detailed Description: The knotify4 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 knotify4 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 knotify4 to run correctly, you can change the context of the executable to unconfined_execmem_exec_t. "chcon -t unconfined_execmem_exec_t '/usr/bin/knotify4'" 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/knotify4'" Fix Command: chcon -t unconfined_execmem_exec_t '/usr/bin/knotify4' 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 knotify4 Source Path /usr/bin/knotify4 Port <Unknown> Host riohigh Source RPM Packages kdebase-runtime-4.1.2-5.fc10 Target RPM Packages Policy RPM selinux-policy-3.5.13-1.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name allow_execstack Host Name riohigh Platform Linux riohigh 2.6.27.3-27.rc1.fc10.i686 #1 SMP Sat Oct 18 20:35:56 EDT 2008 i686 athlon Alert Count 2 First Seen Mon 20 Oct 2008 07:21:30 AM CDT Last Seen Mon 20 Oct 2008 07:21:30 AM CDT Local ID eebb1d00-400c-4898-888b-ae7a132cd800 Line Numbers Raw Audit Messages node=riohigh type=AVC msg=audit(1224505290.544:95): avc: denied { execstack } for pid=2883 comm="knotify4" 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=riohigh type=SYSCALL msg=audit(1224505290.544:95): arch=40000003 syscall=125 success=no exit=-13 a0=bf983000 a1=1000 a2=1000007 a3=fffff000 items=0 ppid=1 pid=2883 auid=501 uid=501 gid=501 euid=501 suid=501 fsuid=501 egid=501 sgid=501 fsgid=501 tty=(none) ses=1 comm="knotify4" exe="/usr/bin/knotify4" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) Summary: SELinux is preventing console-kit-dae (consolekit_t) "sys_resource" consolekit_t. Detailed Description: SELinux denied access requested by console-kit-dae. It is not expected that this access is required by console-kit-dae and this access may signal an intrusion attempt. It is also possible that the specific version or configuration of the application is causing it to require additional access. Allowing Access: You can generate a local policy module to allow this access - see FAQ (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable SELinux protection altogether. Disabling SELinux protection is not recommended. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Additional Information: Source Context system_u:system_r:consolekit_t:s0-s0:c0.c1023 Target Context system_u:system_r:consolekit_t:s0-s0:c0.c1023 Target Objects None [ capability ] Source console-kit-dae Source Path /usr/sbin/console-kit-daemon Port <Unknown> Host riohigh Source RPM Packages ConsoleKit-0.3.0-2.fc10 Target RPM Packages Policy RPM selinux-policy-3.5.13-1.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name riohigh Platform Linux riohigh 2.6.27.3-27.rc1.fc10.i686 #1 SMP Sat Oct 18 20:35:56 EDT 2008 i686 athlon Alert Count 23 First Seen Thu 16 Oct 2008 04:27:59 PM CDT Last Seen Mon 20 Oct 2008 07:20:39 AM CDT Local ID 18c02e39-31cf-4b70-b999-fa910c61d822 Line Numbers Raw Audit Messages node=riohigh type=AVC msg=audit(1224505239.547:88): avc: denied { sys_resource } for pid=1810 comm="console-kit-dae" capability=24 scontext=system_u:system_r:consolekit_t:s0-s0:c0.c1023 tcontext=system_u:system_r:consolekit_t:s0-s0:c0.c1023 tclass=capability node=riohigh type=SYSCALL msg=audit(1224505239.547:88): arch=40000003 syscall=4 success=yes exit=672 a0=1a a1=9fb1758 a2=2a0 a3=9fb1758 items=0 ppid=1 pid=1810 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="console-kit-dae" exe="/usr/sbin/console-kit-daemon" subj=system_u:system_r:consolekit_t:s0-s0:c0.c1023 key=(null) Summary: SELinux is preventing sm-notify (rpcd_t) "sys_resource" rpcd_t. Detailed Description: SELinux denied access requested by sm-notify. It is not expected that this access is required by sm-notify and this access may signal an intrusion attempt. It is also possible that the specific version or configuration of the application is causing it to require additional access. Allowing Access: You can generate a local policy module to allow this access - see FAQ (http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable SELinux protection altogether. Disabling SELinux protection is not recommended. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Additional Information: Source Context unconfined_u:system_r:rpcd_t:s0 Target Context unconfined_u:system_r:rpcd_t:s0 Target Objects None [ capability ] Source rpc.statd Source Path /sbin/rpc.statd Port <Unknown> Host riohigh Source RPM Packages nfs-utils-1.1.3-6.fc10 Target RPM Packages Policy RPM selinux-policy-3.5.12-2.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall Host Name riohigh Platform Linux riohigh 2.6.27-3.fc10.i686 #1 SMP Fri Oct 10 01:26:26 EDT 2008 i686 athlon Alert Count 2 First Seen Thu 16 Oct 2008 05:15:06 PM CDT Last Seen Thu 16 Oct 2008 05:15:06 PM CDT Local ID cc9a1241-41d6-4b07-aa8c-4d2701763004 Line Numbers Raw Audit Messages node=riohigh type=AVC msg=audit(1224195306.728:103): avc: denied { sys_resource } for pid=7184 comm="sm-notify" capability=24 scontext=unconfined_u:system_r:rpcd_t:s0 tcontext=unconfined_u:system_r:rpcd_t:s0 tclass=capability node=riohigh type=SYSCALL msg=audit(1224195306.728:103): arch=40000003 syscall=4 success=yes exit=5 a0=5 a1=bffbd700 a2=5 a3=5 items=0 ppid=7183 pid=7184 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=1 comm="sm-notify" exe="/usr/sbin/sm-notify" subj=unconfined_u:system_r:rpcd_t:s0 key=(null) Which ones should I file bugs against, if there are any to file? I have seen knotify and selinux again, this one is filed. Do I need more info? Thanks, Antonio __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

3 2

SELinux troubleshooter
by Rahul Sundaram 20 Oct '08

20 Oct '08

Hi, It would be nice if I could just tell SELinux troubleshooter not to show me alerts at all or filter out particular set of alerts so I don't get repeated popups say when building a live cd or for known issues. It is otherwise quite annoying at times and I have to kill it to get it to shut up. Rahul

2 2

libavfilter SELinux policy issue
by Rahul Sundaram 20 Oct '08

20 Oct '08

Hi. This makes Firefox crash if SELinux is in enforcing mode. Summary: SELinux is preventing ld-linux.so.2 from loading /usr/lib/libavfilter.so.0.1.0 which requires text relocation. Detailed Description: [SELinux is in permissive mode, the operation would have been denied but was permitted due to permissive mode.] The ld-linux.so.2 application attempted to load /usr/lib/libavfilter.so.0.1.0 which requires text relocation. This is a potential security problem. Most libraries do not need this permission. Libraries 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. You can configure SELinux temporarily to allow /usr/lib/libavfilter.so.0.1.0 to use relocation as a workaround, until the library is fixed. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Allowing Access: If you trust /usr/lib/libavfilter.so.0.1.0 to run correctly, you can change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t '/usr/lib/libavfilter.so.0.1.0'" 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 textrel_shlib_t '/usr/lib/libavfilter.so.0.1.0'" Fix Command: chcon -t textrel_shlib_t '/usr/lib/libavfilter.so.0.1.0' Additional Information: Source Context system_u:system_r:prelink_t:s0-s0:c0.c1023 Target Context system_u:object_r:lib_t:s0 Target Objects /usr/lib/libavfilter.so.0.1.0 [ file ] Source ld-linux.so.2 Source Path /lib/ld-2.8.90.so Port <Unknown> Host sundaram Source RPM Packages glibc-2.8.90-13 Target RPM Packages ffmpeg-libs-0.4.9-0.50.20080908.fc10 Policy RPM selinux-policy-3.5.10-3.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Permissive Plugin Name allow_execmod Host Name sundaram Platform Linux sundaram 2.6.25.14-108.fc9.i686 #1 SMP Mon Aug 4 14:08:11 EDT 2008 i686 i686 Alert Count 1 First Seen Fri 17 Oct 2008 04:05:58 AM IST Last Seen Fri 17 Oct 2008 04:05:58 AM IST Local ID 5bf00553-84ae-49ea-a793-7977855b9541 Line Numbers Raw Audit Messages node=sundaram type=AVC msg=audit(1224196558.619:111): avc: denied { execmod } for pid=27387 comm="ld-linux.so.2" path="/usr/lib/libavfilter.so.0.1.0" dev=dm-0 ino=68753 scontext=system_u:system_r:prelink_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file node=sundaram type=SYSCALL msg=audit(1224196558.619:111): arch=40000003 syscall=125 success=yes exit=0 a0=111000 a1=3000 a2=5 a3=bfbedde0 items=0 ppid=27136 pid=27387 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=10 comm="ld-linux.so.2" exe="/lib/ld-2.8.90.so" subj=system_u:system_r:prelink_t:s0-s0:c0.c1023 key=(null) Rahul

2 1

Question on SELinux‏
by lionel ong 18 Oct '08

18 Oct '08

Hi! I am currently exploring the SELinux policy management GUI tool (polgengui) and trying to create a policy to stop Firefox from using its default port 80, so that when I do a *netstat *command on the terminal, the Firefox application will not be shown using tcp port 80 but some other tcp port instead. Is there any commands on terminal or ways to use the tool that I could use to accomplish the above? Thanks for your time! Regards, Lionel _________________________________________________________________ Join the Fantasy Football club and win cash prizes here! http://fantasyfootball.sg.msn.com

2 1

SELinux, VLC and text relocation
by Rahul Sundaram 18 Oct '08

18 Oct '08

Hi Summary: SELinux is preventing vlc from loading /usr/lib/vlc/codec/librealvideo_plugin.so which requires text relocation. Detailed Description: [SELinux is in permissive mode, the operation would have been denied but was permitted due to permissive mode.] The vlc application attempted to load /usr/lib/vlc/codec/librealvideo_plugin.so which requires text relocation. This is a potential security problem. Most libraries do not need this permission. Libraries 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. You can configure SELinux temporarily to allow /usr/lib/vlc/codec/librealvideo_plugin.so to use relocation as a workaround, until the library is fixed. Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package. Allowing Access: If you trust /usr/lib/vlc/codec/librealvideo_plugin.so to run correctly, you can change the file context to textrel_shlib_t. "chcon -t textrel_shlib_t '/usr/lib/vlc/codec/librealvideo_plugin.so'" 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 textrel_shlib_t '/usr/lib/vlc/codec/librealvideo_plugin.so'" Fix Command: chcon -t textrel_shlib_t '/usr/lib/vlc/codec/librealvideo_plugin.so' Additional Information: Source Context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1 023 Target Context system_u:object_r:lib_t:s0 Target Objects /usr/lib/vlc/codec/librealvideo_plugin.so [ file ] Source vlc Source Path /usr/bin/vlc Port <Unknown> Host sundaram Source RPM Packages vlc-core-0.9.4-1.fc10 Target RPM Packages vlc-core-0.9.4-1.fc10 Policy RPM selinux-policy-3.5.12-3.fc10 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Permissive Plugin Name allow_execmod Host Name sundaram Platform Linux sundaram 2.6.27-13.fc10.i686 #1 SMP Wed Oct 15 02:06:26 EDT 2008 i686 i686 Alert Count 1 First Seen Sat 18 Oct 2008 08:18:07 AM IST Last Seen Sat 18 Oct 2008 08:18:07 AM IST Local ID 046cbf7a-5c30-4f56-8e3a-01169befcb34 Line Numbers Raw Audit Messages node=sundaram type=AVC msg=audit(1224298087.506:271): avc: denied { execmod } for pid=25126 comm="vlc" path="/usr/lib/vlc/codec/librealvideo_plugin.so" dev=dm-0 ino=246161 scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:lib_t:s0 tclass=file node=sundaram type=SYSCALL msg=audit(1224298087.506:271): arch=40000003 syscall=125 success=yes exit=0 a0=7859000 a1=19000 a2=5 a3=bf8a3690 items=0 ppid=1 pid=25126 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="vlc" exe="/usr/bin/vlc" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null) Rahul

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

selinux October 2008