Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/directory v12

[Vasiliy Kulikov]

On Thu, Sep 15, 2011 at 14:29 +0400, Cyrill Gorcunov wrote:
> On Thu, Sep 15, 2011 at 01:27:57PM +0400, Vasiliy Kulikov wrote:
> ...
> > 
> > > in case two of them has a mapping shared, we map
> > >    the memory by the 1st one and then open its /proc/$pid/map_files/address file and
> > >    map it by the 2nd task.
> > 
> > How can you restore a set of processes in case they share an RW mapping
> > as RW in both tasks if you deny opening /proc/$pid/map_files/$address as W?
> 
> I can read the link first to figure out the file path and re-open it as rw via
> path itself (which implies the restorer still must have enough rights to open
> it as rw).

And what about RW mapping of unlinked files?

-- 
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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