Re: [patch] PID namespace design bug, workaround

[Nicholas Miell]

On Fri, 2007-11-02 at 10:39 -0700, Linus Torvalds wrote:
> 
> On Fri, 2 Nov 2007, Dave Hansen wrote:
> > 
> > There are certainly more of these, but here is one In the futex
> > userspace address, we install the current pid's vnr into a userspace
> > address.  
> 
> Now, realistically, why not just say "you can't use these things across 
> namespaces"? Does anybody really care? After all, somebody who screws this 
> up only screws himself, not anybody else.
> 
> 		Linus

Accessing the same robust futex from different PID namespaces on the
same machine via a shared file mapping is logically equivalent to
accessing the same robust futex from different machines via a shared
filesystem and there's no reason to expect either operation to work
correctly.

-- 
Nicholas Miell <nmiell@xxxxxxxxxxx>

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