Re: [PATCH 1/3] userfaultfd/sysctl: introduce unprivileged_userfaultfd

2019-03-12 Thread Mike Rapoport
On Tue, Mar 12, 2019 at 08:26:33PM +0800, Peter Xu wrote: > On Tue, Mar 12, 2019 at 08:58:30AM +0200, Mike Rapoport wrote: > > [...] > > > > +config USERFAULTFD_UNPRIVILEGED_DEFAULT > > > +string "Default behavior for unprivileged userfault syscalls" > > > +depends on USERFAULTFD

Re: [PATCH 1/3] userfaultfd/sysctl: introduce unprivileged_userfaultfd

2019-03-12 Thread Peter Xu
On Tue, Mar 12, 2019 at 08:58:30AM +0200, Mike Rapoport wrote: [...] > > +config USERFAULTFD_UNPRIVILEGED_DEFAULT > > +string "Default behavior for unprivileged userfault syscalls" > > +depends on USERFAULTFD > > +default "disabled" > > +help > > + Set

Re: [PATCH 1/3] userfaultfd/sysctl: introduce unprivileged_userfaultfd

2019-03-12 Thread Mike Rapoport
On Mon, Mar 11, 2019 at 05:36:59PM +0800, Peter Xu wrote: > Introduce a new sysctl called "vm.unprivileged_userfaultfd" that can > be used to decide whether userfaultfd syscalls are allowed by > unprivileged users. It'll allow three modes: > > - disabled: disallow unprivileged users to use

[PATCH 1/3] userfaultfd/sysctl: introduce unprivileged_userfaultfd

2019-03-11 Thread Peter Xu
Introduce a new sysctl called "vm.unprivileged_userfaultfd" that can be used to decide whether userfaultfd syscalls are allowed by unprivileged users. It'll allow three modes: - disabled: disallow unprivileged users to use uffd - enabled: allow unprivileged users to use uffd - kvm: