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



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On 10/22/2012 04:13 PM, Cole Robinson wrote:
> 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
> 
I would guess you could walk the stack until you got a file system with a label.

dirs(newpath) ...

For example in /mnt/a/b/c

Check /mnt/a/b/c, then /mnt/a/b then /mnt/a then /mnt then /

It should definitely not set it to file_t.

I will send this question off to the selinux list to see if they have any
better suggestions.
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