Quoting Eric W. Biederman ([email protected]):
> >> keys are essentially security credentials for something besides the
> >> local kernel. Think kerberos tickets. That makes the keys the
> >> obvious place to say what uid you are in a different user namespace
> >> and similar things.
> >
> > what about performance ? wouldn't that slow the checking ?
>
> It needs to be looked at, but it shouldn't slow the same namespace
> case,
How so? The processesing is the same.
> and permission checking is largely a slow path issue. So a little
> overhead at open time is preferred to overhead after you get the file
> open.
Unsure which approach has overhead after file open...
-serge
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