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    SubjectRe: [RFC] fs, proc: Introduce the /proc/<pid>/map_files/ directory v2
    On Thu, Aug 25, 2011 at 04:04:35PM +0200, Andi Kleen wrote:
    ...
    > > >
    > > > For example if I pass a file descriptor into a chroot process for
    > > > reading, and with this interface you can open it for writing too.
    > > > I could see this causing problems.
    > >
    > > How does it differ from the /proc/pid/fd links?
    >
    > Those cannot be opened I thought.
    > -Andi
    >

    We have ptrace_may_access in lookup so I don't think you'll be
    able to open it from another namespace or/and if you have not
    enough credentials to.

    Cyrill


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