Again for the record, if anybody is looking for a 9P2000.L FUSE implementation, I had to write one, I used github.com/hugelgupf/p9 as a base:
git clone g...@the-dam.org:f29p With that, one can mount a 9P2000.L server from inside a linux 'mount namespace'. I'll talk about that if my paper passes the IWP9 review. Cheers, Edouard. Edouard Klein <e...@rdklein.fr> writes: > For the record here is the lkml post > https://lkml.org/lkml/2023/10/28/155 > Edouard Klein <e...@rdklein.fr> writes: > >> Thanks Moody for the nudge in a direction I hadn't explored. >> >> It seems that Linux does not see 9p as been safe to mount without >> privilege. From what I understand, only FS with the FS_USERNS_MOUNT flag >> can be mounted in a user namespace. It seems that v9fs is not one of >> them: >> >> For example, tmpfs is a safe FS, and I can do: >> unshare --user --map-root-user --mount >> mount -t tmpfs tmpfs mnt/mnt1/ >> >> and it works. >> >> However, if I do: >> unshare --user --map-root-user --mount >> mount -t 9p -o trans=unix /run/9p/srv4 mnt/mnt1 >> >> I get mount: /home/edouard/mnt/mnt1: permission denied. >> >> >> I've sent an email to the linux kernel mailing list to see if somebody >> there has any up to date information. >> >> Somebody tried the same thing in 2018: >> https://lore.kernel.org/all/39b08c53-3449-3164-c1b1-44ac587dd...@metux.net/T/ >> Seemingly without succeeding. >> >> The end of the above thread is a bit worrying: >>> plan9fs would >>> also be a candidate for that kind of treatment if it had a maintainer. >> >> I did not know v9fs was unmaintained, I find that a bit surprising. It >> does work very reliably. >> >> I'll keep this list updated as I make progress. >> >> Cheers, >> >> Edouard >> >> mo...@posixcafe.org writes: >> >>> Edouard, >>> >>> I am no Linux expert, but I think if you create a mount namespace as part of >>> the user namespace you will be allowed to execute mounts without root. In >>> terms of clients, I am not aware >>> of any other then the one within the linux kernel. >>> >>> Regards, >>> Moody >>> 9fans / 9fans / see discussions + participants + delivery options Permalink ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tb5d039f675c54046-M9d4a22b7f8e14bfa2bb23e3c Delivery options: https://9fans.topicbox.com/groups/9fans/subscription
