FreeBSD Security Advisory FreeBSD-SA-19:10.ufs

[Ed Maste]

On Wed, 3 Jul 2019 at 06:05, Doug Hardie <bc979 at lafn.org> wrote:
>
> > Afterwards, reboot the system and run:
> >
> > # fsck -t ufs -f -p -T ufs:-z
> >
> > to clean up your existing filesystems.
>
> After rebooting the system I get:
>
> master# fsck -t ufs -f -p -T ufs:-z
> /dev/ada0p2: NO WRITE ACCESS
> /dev/ada0p2: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
>
> Is this expected result or is there a problem here?

Thanks for reporting this - it looks like some more detail will need
to be added to the SA. The fsck needs to be run without the filesystem
being mounted read-write, most likely in single user mode.

I brought a test system down to single user mode, remounted / as
read-only, and ran the fsck command as follows:

# shutdown now
...
Enter full pathname of shell or RETURN for /bin/sh:
# mount -u -o ro /
# fsck -t ufs -f -p -T ufs:-z
/dev/ufsid/5bf225f5889c157d: 28576 files, 304757 used, 27570235 free
(899 frags, 3446167 blocks, 0.0% fragmentation)
# exit