Bug 890699
| Summary: | SELinux is preventing /usr/bin/bash from 'getattr' accesses on the file /usr/bin/kmod. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Ian Pilcher <ipilcher> |
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 18 | CC: | dominick.grift, dwalsh, mgrepl |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Unspecified | ||
| Whiteboard: | abrt_hash:0ad27d71068dccfc1a06ed97e859dd31cd3a26dc46d6b3a11887e3054473b0bc | ||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-01-23 01:54:34 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: | |||
Does ovs-ctl execute kmod? Are you getting more AVC msgs? Could you re-test it and execute # ausearch -m avc -ts recent Thank you. The large majority of the kmod-related AVCs seem to occur when the Open vSwitch daemon starts. I just rebooted with the daemon (and all bridges) disabled, and starting ovs-vswitchd manually (sudo systemctl start openvswitch.service) gave me the following:
type=AVC msg=audit(1357140555.479:49): avc: denied { getattr } for pid=2009 comm="ovs-ctl" path="/usr/bin/kmod" dev="dm-0" ino=1724555 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:insmod_exec_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.479:49): arch=c000003e syscall=4 success=yes exit=0 a0=1fb1650 a1=7fff870a7b10 a2=7fff870a7b10 a3=f items=0 ppid=2008 pid=2009 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ovs-ctl" exe="/usr/bin/bash" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.479:50): avc: denied { execute } for pid=2009 comm="ovs-ctl" name="kmod" dev="dm-0" ino=1724555 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:insmod_exec_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.479:50): arch=c000003e syscall=21 success=yes exit=0 a0=1fb1650 a1=1 a2=7fff870a7a50 a3=f items=0 ppid=2008 pid=2009 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ovs-ctl" exe="/usr/bin/bash" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.479:51): avc: denied { read } for pid=2009 comm="ovs-ctl" name="kmod" dev="dm-0" ino=1724555 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:insmod_exec_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.479:51): arch=c000003e syscall=21 success=yes exit=0 a0=1fb1650 a1=4 a2=7fff870a7a50 a3=f items=0 ppid=2008 pid=2009 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ovs-ctl" exe="/usr/bin/bash" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.479:52): avc: denied { open } for pid=2115 comm="ovs-ctl" path="/usr/bin/kmod" dev="dm-0" ino=1724555 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:insmod_exec_t:s0 tclass=file
type=AVC msg=audit(1357140555.479:52): avc: denied { execute_no_trans } for pid=2115 comm="ovs-ctl" path="/usr/bin/kmod" dev="dm-0" ino=1724555 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:insmod_exec_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.479:52): arch=c000003e syscall=59 success=yes exit=0 a0=1fb1650 a1=1f5bc70 a2=1fa86e0 a3=18 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.480:53): avc: denied { getattr } for pid=2115 comm="modprobe" path="/etc/modprobe.d" dev="dm-0" ino=131080 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=dir
type=SYSCALL msg=audit(1357140555.480:53): arch=c000003e syscall=4 success=yes exit=0 a0=3e9860f98f a1=7fff9d163e10 a2=7fff9d163e10 a3=365f3638782e3831 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.480:54): avc: denied { read } for pid=2115 comm="modprobe" name="modprobe.d" dev="dm-0" ino=131080 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=dir
type=AVC msg=audit(1357140555.480:54): avc: denied { open } for pid=2115 comm="modprobe" path="/etc/modprobe.d" dev="dm-0" ino=131080 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=dir
type=SYSCALL msg=audit(1357140555.480:54): arch=c000003e syscall=257 success=yes exit=3 a0=ffffffffffffff9c a1=3e9860f98f a2=90800 a3=0 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.480:55): avc: denied { search } for pid=2115 comm="modprobe" name="modprobe.d" dev="dm-0" ino=131080 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=dir
type=AVC msg=audit(1357140555.480:55): avc: denied { getattr } for pid=2115 comm="modprobe" path="/etc/modprobe.d/udlfb.conf" dev="dm-0" ino=140487 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.480:55): arch=c000003e syscall=262 success=yes exit=0 a0=3 a1=7fff9d163f43 a2=7fff9d163ea0 a3=0 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.480:56): avc: denied { getattr } for pid=2115 comm="modprobe" path="/etc/modprobe.d/kvm-intel.conf" dev="dm-0" ino=131082 scontext=system_u:system_r:openvswitch_t:s0 tcontext=unconfined_u:object_r:modules_conf_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.480:56): arch=c000003e syscall=262 success=yes exit=0 a0=3 a1=7fff9d163f43 a2=7fff9d163ea0 a3=0 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.480:57): avc: denied { read } for pid=2115 comm="modprobe" name="blacklist.conf" dev="dm-0" ino=131081 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=file
type=AVC msg=audit(1357140555.480:57): avc: denied { open } for pid=2115 comm="modprobe" path="/etc/modprobe.d/blacklist.conf" dev="dm-0" ino=131081 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_conf_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.480:57): arch=c000003e syscall=2 success=yes exit=3 a0=7fff9d163f30 a1=80000 a2=7fff9d163f4e a3=e items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.480:58): avc: denied { read } for pid=2115 comm="modprobe" name="kvm-intel.conf" dev="dm-0" ino=131082 scontext=system_u:system_r:openvswitch_t:s0 tcontext=unconfined_u:object_r:modules_conf_t:s0 tclass=file
type=AVC msg=audit(1357140555.480:58): avc: denied { open } for pid=2115 comm="modprobe" path="/etc/modprobe.d/kvm-intel.conf" dev="dm-0" ino=131082 scontext=system_u:system_r:openvswitch_t:s0 tcontext=unconfined_u:object_r:modules_conf_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.480:58): arch=c000003e syscall=2 success=yes exit=3 a0=7fff9d163f30 a1=80000 a2=7fff9d163f4e a3=e items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.481:59): avc: denied { search } for pid=2115 comm="modprobe" name="modules" dev="dm-0" ino=1703971 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_object_t:s0 tclass=dir
type=AVC msg=audit(1357140555.481:59): avc: denied { read } for pid=2115 comm="modprobe" name="modules.dep.bin" dev="dm-0" ino=1842811 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_object_t:s0 tclass=file
type=AVC msg=audit(1357140555.481:59): avc: denied { open } for pid=2115 comm="modprobe" path="/usr/lib/modules/3.6.10-4.fc18.x86_64/modules.dep.bin" dev="dm-0" ino=1842811 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_object_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.481:59): arch=c000003e syscall=2 success=yes exit=3 a0=7fff9d163fa0 a1=80000 a2=6ce170 a3=20 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
type=AVC msg=audit(1357140555.481:60): avc: denied { getattr } for pid=2115 comm="modprobe" path="/usr/lib/modules/3.6.10-4.fc18.x86_64/modules.dep.bin" dev="dm-0" ino=1842811 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_object_t:s0 tclass=file
type=SYSCALL msg=audit(1357140555.481:60): arch=c000003e syscall=5 success=yes exit=0 a0=3 a1=7fff9d163ec0 a2=7fff9d163ec0 a3=20 items=0 ppid=2009 pid=2115 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modprobe" exe="/usr/bin/kmod" subj=system_u:system_r:openvswitch_t:s0 key=(null)
I also see denials when shutting down VMs:
type=AVC msg=audit(1357139193.951:4444): avc: denied { module_request } for pid=1584 comm="ovs-vswitchd" kmod="netdev-vnet13" scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system
type=SYSCALL msg=audit(1357139193.951:4444): arch=c000003e syscall=16 success=no exit=-19 a0=10 a1=8913 a2=7fff99c842d0 a3=ffffffff items=0 ppid=1583 pid=1584 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ovs-vswitchd" exe=2F7573722F7362696E2F6F76732D7673776974636864202864656C6574656429 subj=system_u:system_r:openvswitch_t:s0 key=(null)
These are not 100% consistent, however. I just shut down a VM with 4 Open vSwitch VNICs, and I only received two of these messages. Then I shut down a different 4-VNIC VM, and saw no denials at all.
I have not seen any kmod-related AVCs when running ovs-vsctl directly. The other denials I'm getting are the netlink socket-related ones in bug 890762.
One other thing, that I should probably state explicitly, is that all of my bridges appear to be working just fine. In fact, you can see that many of the AVC-generating system calls are succeeding, even though the system is in enforcing mode. That is probably because openvswich_t is a permissive domain. Looks like it is just scanning for loaded modules and then asking the kernel to load them. I just added these rules to F19 policy. Miroslav please back port. Added to selinux-policy-3.11.1-70.fc18 selinux-policy-3.11.1-71.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/selinux-policy-3.11.1-71.fc18 Package selinux-policy-3.11.1-71.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.11.1-71.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-0945/selinux-policy-3.11.1-71.fc18 then log in and leave karma (feedback). selinux-policy-3.11.1-71.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report. |
Description of problem: SELinux is preventing /usr/bin/bash from 'getattr' accesses on the file /usr/bin/kmod. ***** Plugin catchall (100. confidence) suggests *************************** If you believe that bash should be allowed getattr access on the kmod file by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # grep ovs-ctl /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Additional Information: Source Context system_u:system_r:openvswitch_t:s0 Target Context system_u:object_r:insmod_exec_t:s0 Target Objects /usr/bin/kmod [ file ] Source ovs-ctl Source Path /usr/bin/bash Port <Unknown> Host (removed) Source RPM Packages bash-4.2.39-3.fc18.x86_64 Target RPM Packages kmod-10-1.fc18.x86_64 Policy RPM selinux-policy-3.11.1-66.fc18.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 3.6.10-4.fc18.x86_64 #1 SMP Tue Dec 11 18:01:27 UTC 2012 x86_64 x86_64 Alert Count 2 First Seen 2012-12-28 15:45:09 CST Last Seen 2012-12-28 15:52:04 CST Local ID 30f37de9-4fc5-45ac-aa9b-7c2c2034c620 Raw Audit Messages type=AVC msg=audit(1356731524.782:21): avc: denied { getattr } for pid=1881 comm="ovs-ctl" path="/usr/bin/kmod" dev="dm-0" ino=1724555 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:insmod_exec_t:s0 tclass=file type=SYSCALL msg=audit(1356731524.782:21): arch=x86_64 syscall=stat success=yes exit=0 a0=133d650 a1=7fff1d274e70 a2=7fff1d274e70 a3=f items=0 ppid=1879 pid=1881 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=ovs-ctl exe=/usr/bin/bash subj=system_u:system_r:openvswitch_t:s0 key=(null) Hash: ovs-ctl,openvswitch_t,insmod_exec_t,file,getattr audit2allow audit2allow -R Additional info: hashmarkername: setroubleshoot kernel: 3.6.10-4.fc18.x86_64 type: libreport