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    SubjectRe: [PATCH v3 2/6] userfaultfd: add /dev/userfaultfd for fine grained access control
    On Wed,  1 Jun 2022 14:09:47 -0700 Axel Rasmussen <axelrasmussen@google.com> wrote:

    > To achieve this, add a /dev/userfaultfd misc device. This device
    > provides an alternative to the userfaultfd(2) syscall for the creation
    > of new userfaultfds. The idea is, any userfaultfds created this way will
    > be able to handle kernel faults, without the caller having any special
    > capabilities. Access to this mechanism is instead restricted using e.g.
    > standard filesystem permissions.

    The use of a /dev node isn't pretty. Why can't this be done by
    tweaking sys_userfaultfd() or by adding a sys_userfaultfd2()?

    Peter, will you be completing review of this patchset?

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