13 Jun
2022
13 Jun
'22
9:55 p.m.
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?