On 09/16/2017 02:39 PM, Hans van Kranenburg wrote: > On 09/16/2017 11:45 AM, Ulli Horlacher wrote: >> Every user can create subvolumes (and root cannot prevent it!). >> But how can a user list these subvolumes? >> >> tux@xerus:/test/tux: btrfs subvolume create test >> Create subvolume './test' > > From your other posts I don't quickly get if you actually do want to > have this possible, or accept that it's currently like that and try to > do damage control by having users also remove their things again. > > Actually, if you don't want this I think it's quite easily to patch your > kernel with one or two lines of code to disallow it. > >> tux@xerus:/test/tux: btrfs subvolume list . >> ERROR: can't perform the search - Operation not permitted > > Yes, because the SEARCH ioctl only allows root to directly query any of > the filesystem metadata from kernel memory. subvolume list uses this > SEARCH ioctl to find it's info. its! Argh! D: -- Hans van Kranenburg -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
