On Tue, 2024-12-03 at 10:08 +0100, Christian Brauner wrote: > > Though, I wonder if a similar but separate prohibition > > mechanism might be necessary for other in-kernel network > > file system server implementations (eg, ksmbd). > > Oh hm, interesting question. > I have no idea how ksmbd or 9p "exports" work. I really hope they don't > allow exporting arbitrary pseudo-fses. SMB is path-based so there's no worry about filehandles there. It looks like ksmbd keeps a set of ksmbd_share_config objects, that are configured by userland. If someone deliberately shares stuff under /proc, then I guess they get to keep all of the pieces. ;) 9P does use filehandles, but there is no in-kernel server, so far. Wedson had one in development at one point [1], but I haven't heard anything about it in a while. [1]: https://kangrejos.com/Async%20Rust%20and%209p%20server.pdf -- Jeff Layton <jlayton@xxxxxxxxxx>
