[Virtio-fs] [PATCH v3 5/6] fuse: Add a flag FUSE_OPEN_KILL_PRIV for open() request

[Miklos Szeredi]

On Fri, Oct 9, 2020 at 8:16 PM Vivek Goyal <vgoyal at redhat.com> wrote:
>
> With FUSE_HANDLE_KILLPRIV_V2 support, server will need to kill
> suid/sgid/security.capability on open(O_TRUNC), if server supports
> FUSE_ATOMIC_O_TRUNC.
>
> But server needs to kill suid/sgid only if caller does not have
> CAP_FSETID. Given server does not have this information, client
> needs to send this info to server.
>
> So add a flag FUSE_OPEN_KILL_PRIV to fuse_open_in request which tells
> server to kill suid/sgid(only if group execute is set).

This is needed for FUSE_CREATE as well (which may act as a normal open
in case the file exists, and no O_EXCL was specified), right?

I can edit the patch, if you agree.

Thanks,
Miklos