[libvirt] unable to set security context (NFSv4 problem?)

Daniel P. Berrange berrange at redhat.com
Thu Apr 22 13:39:39 UTC 2010

On Thu, Apr 22, 2010 at 03:16:08PM +0200, Harald Dunkel wrote:
> Hi Daniel,
> On 04/22/10 11:41, Daniel P. Berrange wrote:
> > 
> > This is unfixably broken then. NFS security relies on all clients using
> > the same UID/GID <-> name mappings.
> > 
> How comes that we don't run into a similar security problem
> for iSCSI?

In NFS, the user/group IDs for files are stored on the NFS server. Thus
all clients must have same interpretation for these IDs.

In iSCSI the user/group IDs are assigned to the block device nodes which 
are always local to each client logged into the iSCSI server. Thus there
is no requirement for the same interpretation  on all clients

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