Red Hat Bugzilla – Bug 355661
dnsmasq accesses /var/lib/libvirt
Last modified: 2008-01-30 14:20:56 EST
Description of problem: The selinux policy does not allow access to /var/lib/libvirt which has the label virt_var_lib_t. I don't see a reason why this directory is accessed. For this reason I file the bug for dnsmasq and not selinux-policy. Should there be a real reason move the file to selinux-policy. Version-Release number of selected component (if applicable): dnsmasq-2.40-1.fc8.x86_64 How reproducible: I cannot say... Steps to Reproduce: 1. 2. 3. Actual results: AVC below Expected results: No AVC Additional info: Summary SELinux is preventing dnsmasq (dnsmasq_t) "write" to <Unknown> (virt_var_lib_t). Detailed Description SELinux denied access requested by dnsmasq. It is not expected that this access is required by dnsmasq 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 Sometimes labeling problems can cause SELinux denials. You could try to restore the default system file context for <Unknown>, restorecon -v <Unknown> If this does not work, there is currently no automatic way to allow this access. Instead, you can generate a local policy module to allow this access - see 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 http://bugzilla.redhat.com/bugzilla/enter_bug.cgi against this package. Additional Information Source Context system_u:system_r:dnsmasq_t:s0 Target Context system_u:object_r:virt_var_lib_t:s0 Target Objects None [ dir ] Affected RPM Packages Policy RPM selinux-policy-3.0.8-24.fc8 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name plugins.catchall_file Host Name x61.akkadia.org Platform Linux x61.akkadia.org 2.6.23.1-23.fc8 #1 SMP Wed Oct 17 18:14:46 EDT 2007 x86_64 x86_64 Alert Count 10 First Seen Tue 16 Oct 2007 03:52:31 AM PDT Last Seen Sat 20 Oct 2007 07:48:35 PM PDT Local ID b3fa5b7c-8aaa-4177-b58e-0e06bf8bf2f4 Line Numbers Raw Audit Messages avc: denied { write } for comm=dnsmasq dev=sda5 name=libvirt pid=2287 scontext=system_u:system_r:dnsmasq_t:s0 tclass=dir tcontext=system_u:object_r:virt_var_lib_t:s0
While I could be totally mistaken, I suspect libvirt is configuring your dnsmasq instance to make use of that directory. Nothing in dnsmasq source (or our CVS for it) even refers to that directory, or libvirt at all. However, libvirt makes use of dnsmasq for DHCP services on an internal virtual network (from my understanding). I believe the bug should either be with libvirt or selinux-policy. In summary, I have no way of knowing how "downstream" packages (like libvirt) are going to configure dnsmasq, and shouldn't be responsible for giving them access to things I have no business accessing. :-)
You're right. I didn't expect there to be anything like this since I didn't configure or use libvirt at all on his machine. Nevertheless, there it is, this process is running: /usr/sbin/dnsmasq --keep-in-foreground --strict-order --bind-interfaces --pid-file --conf-file --listen-address 192.168.122.1 --except-interface lo --dhcp-leasefile=/var/lib/libvirt/dhcp-default.leases --dhcp-range 192.168.122.2,192.168.122.254 So, Dan, does the policy allow the lease file to be written? The /var/lib/libvirt directory seems to be correctly labelled: # ll -Zd /var/lib/libvirt drwxr-xr-x root root system_u:object_r:virt_var_lib_t:s0 /var/lib/libvirt
This should be fixed in selinux-policy-3.0.8-38
Bulk closing all bugs in Fedora updates in the modified state. If you bug is not fixed, please reopen.