[libvirt] [PATCH] selinux: relabel tapfd in qemuPhysIfaceConnect

[Eric Blake]

On 10/18/2012 08:21 AM, Guannan Ren wrote:
>>> +++ b/src/qemu/qemu_command.c
>>> @@ -170,6 +170,11 @@ qemuPhysIfaceConnect(virDomainDefPtr def,
>>>           vmop, driver->stateDir,
>>>           virDomainNetGetActualBandwidth(net));
>>>       if (rc >= 0) {
>>> +        if (virSecurityManagerSetTapFDLabel(driver->securityManager,
>>> +                                            def, rc) < 0) {
>>> +            VIR_FORCE_CLOSE(rc);
>>> +            return -1;
>>> +        }
>>>           virDomainAuditNetDevice(def, net, res_ifname, true);
>>>           VIR_FREE(net->ifname);
>> Looks like you leak net->ifname on error, not to mention that you are
>> skipping out on an audit point.  I think you need to fix up the logic
>> here to avoid leaks on failure to relabel the fd.
>>
>      In case of failure of relabel, I leaked char *res_ifname.
>      Shall we need to do the audit on failure of tapfd relabelling?
>      I don't think it is necessary to do it, is it?

Looking closer, this code currently only audits on success: if rc < 0,
then it skips the audit point [I'm not sure if it should also be
auditing on failure, but fixing that should be in a separate patch].  So
for this patch, I think you can also skip the audit point if the relabel
fails, because then you are treating rc as < 0; but you DO need to clean
up the memory that got allocated along the way.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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