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userfaultfd: add /dev/userfaultfd for fine grained access control

Peter Xu requested to merge peterx/centos-stream-9:uffd-dev into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2158706

This patchset backports the /dev/userfaultfd device. It is another way to create an userfaultfd file descriptor, and it is preferred in some restricted environments (e.g. where the userfaultfd() syscall is forbidden).

Signed-off-by: Peter Xu peterx@redhat.com

Edited by Peter Xu

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