Date: Mon, 19 Jul 2010 23:30:05 GMT From: Jilles Tjoelker <jilles@stack.nl> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/61810: mounts done within a chroot show up wrong and can't be unmounted from outside. Message-ID: <201007192330.o6JNU5EW032182@freefall.freebsd.org>
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The following reply was made to PR kern/61810; it has been noted by GNATS. From: Jilles Tjoelker <jilles@stack.nl> To: bug-followup@FreeBSD.org, cliftonr@bass.tikitechnologies.com Cc: Subject: Re: kern/61810: mounts done within a chroot show up wrong and can't be unmounted from outside. Date: Tue, 20 Jul 2010 01:27:54 +0200 Somewhere in 5.x, umount was changed to allow such unmounts. If the passed name matches one in the mount list exactly, the unmount is done by fsid and does not depend on existence of any particular pathname. An fsid may also be specified directly. The "matches exactly" part may become somewhat problematic if vn_fullpath(9) were to be used to return pathnames in statfs returns. Also, vn_fullpath(9) is unreliable and the buffers in the statfs structure are pretty small, so the name as passed to nmount(2) would still be visible in various cases. -- Jilles Tjoelker
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