On Wed, May 27, 2020 at 02:54:13PM +0800, Xiaoming Ni wrote:
On Tue, Mar 19, 2019 at 11:07:22AM +0800, Peter Xu wrote:
Add a global sysctl knob "vm.unprivileged_userfaultfd" to control
whether userfaultfd is allowed by unprivileged users. When this is
set to zero, only privileged users (root user, or users with the
CAP_SYS_PTRACE capability) will be able to use the userfaultfd
I am a bit confused about this patch, can you help to answer it.
Why the sysctl interface of fs/userfaultfd.c belongs to vm_table instead of
Because I think it makes more sense to put the new key into where it suites
better, irrelevant to which directory the variable is declared. To me,
unprivileged_userfaultfd is definitely more suitable for vm rather than fs,
because userfaultfd is really about memory management rather than file system.