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    SubjectRe: BUG: unable to handle kernel NULL pointer dereference in mem_serial_out
    On Fri, Dec 13, 2019 at 11:31:08PM +0900, Tetsuo Handa wrote:
    > On 2019/12/13 19:00, Dmitry Vyukov wrote:
    > > Easier said than done. "normal user of the serial port" is not really
    > > a thing in Linux, right? You either have CAP_SYS_ADMIN or not, that's
    > > not per-device...
    > > As far as I remember +Tetsuo proposed a config along the lines of
    > > "restrict only things that legitimately cause damage under a fuzzer
    > > workload", e.g. freezing filesystems, disabling console output, etc.
    > > This may be another candidate. But I can't find where that proposal is
    > > now.
    > That suggestion got no response for two months.
    > Unless we add such kernel config option to upstream kernels, it will become
    > a whack-a-mole game.

    It will be a whack-a-mole game no matter what.

    Yes, /dev/mem/ makes no sense to fuzz. Neither does other things (like
    serial port memory addresses.)

    You just will have a list of things that you "do not fuzz as these are
    dangerous". Nothing new here, any os will have that.


    greg k-h

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