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    SubjectRe: [PATCH] protect migration/%d etc from sched_setaffinity
    On Thu, 2003-07-31 at 15:46, Joe Korty wrote:

    > Lock out users from changing the cpu affinity of those per-cpu system
    > daemons which cannot survive such a change, such as migration/%d.
    > Passes basic handtest of sched_setaffinity(2) on various locked and
    > unlocked processes on a i386, otherwise untested except by eyeball.
    > Except for one line in i386, no arch needed any changes to support
    > this patch.

    I have been wondering what to do about processor affinity and kernel
    threads. I just concluded "only root can change it, and we can let root
    stab herself if she really wants to."

    But if this is really an issue, why not just do:

    ret = -EINVAL;
    if (!p->mm)
    goto out_unlock;

    in sys_sched_setaffinity ?

    Robert Love

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