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    SubjectRe: [patch 3/6] posix-cpu-timers: Restrict timer_create() permissions
    On Thu, Sep 05, 2019 at 02:03:42PM +0200, Thomas Gleixner wrote:
    > Right now there is no restriction at all to attach a Posix CPU timer to any
    > process in the system. Per thread CPU timers are limited to be created by
    > threads in the same thread group.
    >
    > Timers can be used to observe activity of tasks and also impose overhead on
    > the process to which they are attached because that process needs to do the
    > fine grained CPU time accounting.
    >
    > Limit the ability to attach timers to a process by checking whether the
    > task which is creating the timer has permissions to attach ptrace on the
    > target process.
    >
    > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

    Makes sense. I hope no serious user currently rely on that lack of
    restriction. Let's just apply and wait for complains if any.

    Reviewed-by: Frederic Weisbecker <frederic@kernel.org>

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