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    SubjectRe: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers for child processes
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    > Lennart Poettering <mzxreary@0pointer.de> writes:
    >
    > > On Thu, 04.03.10 15:08, Oleg Nesterov (oleg@redhat.com) wrote:
    > >
    > >> Should we clear ->child_anchor flags when the "sub-init" execs? Or,
    > >> at least, when the task changes its credentials? Probably not, but
    > >> dunno.
    > >
    > > Since this flag is only useful for a very well defined type of processes
    > > (i.e. session managers, supervising daemons, init systems) it might make
    > > sense to reset it automatically when privs are dropped or we exec
    > > something. After all, I don't see how we'd gain any useful functionality
    > > when we allow this flag to continue to be set. However we would
    > > certainly be on the safer side when we reset it, because that way it can
    > > never leak it to processes that are differently privileged or do not
    > > expect it.
    > >
    > > So, for the sake of being on the safe side, I think we should reset the
    > > flag on exec()/setuid().
    > >
    > >> It is a bit strange that PR_SET_ANCHOR acts per-thread, not per
    > >> process.
    > >
    > > Yes, I agree, this should be per-process indeed.
    >
    > Have you take a look at the pid namespace?
    >
    > Except for the fact it requires privilege to create it seems to do
    > what you want. It is certainly what I have been using when I want
    > an inescapable environment.
    >
    > If nothing else I get the feeling that what you are after is
    > a generalization of the child_reaper feature in the pid namespace
    > and yet you haven't touched any of that code.

    I guess it doesn't fit for gnome-session. because gtop or similar
    system monitoring process assume it can see all processes in the system.

    thanks.



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