Miklos Szeredi <mszer...@redhat.com> writes:
> On Fri, Dec 22, 2017 at 3:32 PM, Dongsu Park <don...@kinvolk.io> wrote:
>> From: Seth Forshee <seth.fors...@canonical.com>
>> The user in control of a super block should be allowed to freeze
>> and thaw it. Relax the restrictions on the FIFREEZE and FITHAW
>> ioctls to require CAP_SYS_ADMIN in s_user_ns.
> Why is this required for unprivileged fuse?
> Fuse doesn't support freeze, so this seems to make no sense in the
> context of this patchset.
This isn't required to support fuse. It is a relaxation in permissions
so it isn't strictly necessary for anything.
Until just recently Seth and I work working through the vfs looking at
what we need in general for unprivileged mounts. With fuse as our focus
but we were not limiting ourselves to fuse.
I have been putting off relaxation of permissions like this because they
are not necessary for safety. But in general they do make sense.
In practice I think all we need to worry about for fuse is the last 4 patches.