DragonFly BSD
DragonFly bugs List (threaded) for 2006-01
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Re: nullfs mount ignores readonly flag

From: David Beck <dbeck@xxxxxxxxxxxxx>
Date: Mon, 09 Jan 2006 10:11:28 +0100

Would that fix mean that the no-setuid, no-exec and other flags will work as well?

Regards, David.

Matthew Dillon wrote:

I expect there will be things that need working on. That's one of
them. Hmm. We will probably have to hold the namecache entry for
normal files and use the namecache's mount point to check for the
read-only filesystem status. No biggy (we already do this for directories to maintain the CD path), but it may take a few days to

Matthew Dillon <dillon@xxxxxxxxxxxxx>

:A few experiments on 1.5 nullfs showed that it ignores the read-only flag:
:/mnt: mkdir 1 2
:/mnt: mount_null -o ro /mnt/1 /mnt/2
:/mnt: mount
:/mnt/1 on /mnt/2 (null, local, read-only)
:/mnt: cd /mnt/1
:/mnt/1: echo > k
:/mnt/1: cd /mnt/2
:/mnt/2: rm k
:/mnt/2: ls
:/mnt/2: cd /mnt/1
:/mnt/1: ls -ltr
:total 0
:I could delete a file on a read-only filesystem. Oops.
:Regards, David.

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