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Re: [libvirt] [PATCH] selinux: Don't fail RestoreAll if file doesn't have a default label



On 10/22/2012 11:51 AM, Eric Blake wrote:
> On 10/21/2012 02:44 PM, Cole Robinson wrote:
>> When restoring selinux labels after a VM is stopped, any non-standard
>> path that doesn't have a default selinux label causes the process
>> to stop and exit early. This isn't really an error condition IMO.
>>
>> Of course the selinux API could be erroring for some other reason
>> but hopefully that's rare enough to not need explicit handling.
>>
>> Common example here is storing disk images in a non-standard location
>> like under /mnt.
>> ---
>>  src/security/security_selinux.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
>> index eee8d71..7681f1b 100644
>> --- a/src/security/security_selinux.c
>> +++ b/src/security/security_selinux.c
>> @@ -936,7 +936,11 @@ virSecuritySELinuxRestoreSecurityFileLabel(const char *path)
>>      }
>>  
>>      if (getContext(newpath, buf.st_mode, &fcon) < 0) {
>> +        /* Any user created path likely does not have a default label,
>> +         * which makes this an expected non error
>> +         */
>>          VIR_WARN("cannot lookup default selinux label for %s", newpath);
>> +        rc = 0;
> 
> In the case where there is no default label to restore, shouldn't we
> still be removing our sVirt label rather than just ignoring the failure
> but leaving our label intact?
> 

I don't know if we can just 'remove' a label, we have to replace it with a
different label, right? If I create a file under /mnt/foo the catch all label
is unconfined_u:object_r:file_t:s0 but not sure if we can hardcode that.

dwalsh, is there a way to programmatically determine the fallback default label?

- Cole


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