Messages in this thread | | | Subject | Re: [PATCH -mm 5/7] add user namespace | From | Trond Myklebust <> | Date | Fri, 14 Jul 2006 14:15:11 -0400 |
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On Fri, 2006-07-14 at 11:36 -0600, Eric W. Biederman wrote: > Dave Hansen <haveblue@us.ibm.com> writes: > > > On Fri, 2006-07-14 at 12:08 -0500, Serge E. Hallyn wrote: > >> yes, of course, vfsmount, which I assume is what Eric meant? > >> > >> Which means we'd have to do this at permission() using the nameidata, or > >> pass nd to generic_permission. > > > > Yeah, I think so. But, this is well into Al territory, and there might > > be a better way. > > Well until we get that sorted out I will keep picking on i_sb.
Don't bother: labelling superblocks with process-specific data is always going to be unacceptable.
In order to avoid aliased superblocks, you would have to be able guarantee to be the sole owner of the data on the device that it refers to. You'd have to own the device in order to do that, in which case you are better off just labelling the device instead.
Cheers, Trond
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