Date: Tue, 17 May 2005 14:04:53 GMT From: Ronny lam <rlam@snow.nl> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/81161: Images mounted through mdconfig on a read-only fs can be modified Message-ID: <200505171404.j4HE4rBJ023308@www.freebsd.org> Resent-Message-ID: <200505171410.j4HEA2BV095346@freefall.freebsd.org>
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>Number: 81161
>Category: kern
>Synopsis: Images mounted through mdconfig on a read-only fs can be modified
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue May 17 14:10:02 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Ronny lam
>Release: 5.4
>Organization:
Snow B.V.
>Environment:
FreeBSD helix.kateri.demon.nl 5.4-RELEASE-p1 FreeBSD 5.4-RELEASE-p1 #2: Tue May 17 14:26:04 CEST 2005 root@helix.kateri.demon.nl:/usr/local/obj/usr/local/src/sys/HELIX i386
>Description:
When mounting an image through mdconfig which resides on a read-only filesystem, it is possible to changes the md-filesystem and thus change the read-only underlying filesystem. This could be by design but looks like a problem to me.
>How-To-Repeat:
boot single-user, the root filesystem is readonly
mdconfig -a -t vnode -f boot.flp
mount /dev/md0 /mnt
touch /mnt/hello
ls /mnt
mount, root filesystem is still read-only, /mnt is read-write
umount /mnt
mdconfig -d -u 0
mdconfig -a -t vnode -f boot.flp
mount /dev/md0 /mnt
ls /mnt
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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