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    SubjectRe: [PATCH v4 3.0-rc2-tip 4/22] 4: Uprobes: register/unregister probes.
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    On Tue, 2011-06-07 at 18:29 +0530, Srikar Dronamraju wrote:
    > 1. Use mm->owner and walk thro the thread_group of mm->owner, siblings
    > of mm->owner, siblings of parent of mm->owner. This should be
    > good list to traverse. Not sure if this is an exhaustive
    > enough list that all tasks that have a mm set to this mm_struct are
    > walked through.

    As per copy_process():

    /*
    * Thread groups must share signals as well, and detached threads
    * can only be started up within the thread group.
    */
    if ((clone_flags & CLONE_THREAD) && !(clone_flags & CLONE_SIGHAND))
    return ERR_PTR(-EINVAL);

    /*
    * Shared signal handlers imply shared VM. By way of the above,
    * thread groups also imply shared VM. Blocking this case allows
    * for various simplifications in other code.
    */
    if ((clone_flags & CLONE_SIGHAND) && !(clone_flags & CLONE_VM))
    return ERR_PTR(-EINVAL);

    CLONE_THREAD implies CLONE_VM, but not the other way around, we
    therefore would be able to CLONE_VM and not be part of the primary
    owner's thread group.

    This is of course all terribly sad..





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