Bug#1008911: initscripts: /run often mounted nodev, "/run/rootdev" likely to fail

[Elliott Mitchell]

On Tue, Feb 11, 2025 at 05:13:35PM +0000, Mark Hindley wrote:
> On Tue, Feb 11, 2025 at 08:21:48AM -0800, Elliott Mitchell wrote:
> > On Tue, Feb 11, 2025 at 03:22:08PM +0000, Mark Hindley wrote:
> > > 
> > > On Sun, Apr 03, 2022 at 04:23:49PM -0700, Elliott Mitchell wrote:
> > > > Package: initscripts
> > > > Version: 3.02-1
> > > > 
> > > > Often /run is mounted with the "nodev" option, at which point doing a
> > > > `mknod` "/run/rootdev", then trying to `fsck` that doesn't work as a
> > > > fallback.  Perhaps "/dev/fsckfallbackdev"?
> > > 
> > > In the abstract this might be true. But this is used in checkroot.sh which is
> > > run *before* /run is mounted. And /run/rootdev is already a last-chance fallback
> > > after root from /etc/fstab and /dev/root have been tried and failed.
> > > 
> > > So I don't see a problem here. Or am I misunderstanding you or missing
> > > something?
> > 
> > Is it worth having a last-chance fallback which is guaranteed to fail?
> 
> But I think (I may be wrong?) that this last-chance fallback will not
> fail. Remember this is in checkroot.sh which is run *before* /run is mounted in
> mountall.sh (without nodev; see comment). So it is either just a directory in /
> or what an initramfs might have setup.

Which features a key requirement:  The root filesystem is read-write.

The test is *before* / is remounted read-write, so the only way for that
to succeed is if the kernel mounted the root filesystem read-write.  I
guess this is possible, but certainly now very unusual.


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