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Re: kern/53850: mount(2) with MNT_UNION | MNT_UPDATE will lead to panic
The following reply was made to PR kern/53850; it has been noted by GNATS.
From: David Holland <dholland-bugs%netbsd.org@localhost>
Subject: Re: kern/53850: mount(2) with MNT_UNION | MNT_UPDATE will lead to
Date: Thu, 10 Jan 2019 06:59:24 +0000
On Thu, Jan 10, 2019 at 03:45:00AM +0000, n54%gmx.com@localhost wrote:
> Updating a mounted partition to MNT_UNION will lead to a panic.
> main(int argc, char **argv)
> char A;
> mount(NULL, "/", MNT_UNION | MNT_UPDATE, A, 0);
> return 0;
Does it also die if you do this on a mount point other than /, where
there is actually another fs underneath?
(and if you mount over /, does it then not die?)
I kinda think MNT_UPDATE ought not to be allowed to turn MNT_UNION on
and off, but if it otherwise works...
David A. Holland
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