I wonder whether that's a kernel change?

It's a bind mount of the root filesystem, and previously that bind mount
just had whatever permissions the underlying root filesystem had.

Of course, I know that the kernel recently gained support for bind
mounts being mounted differently - I wonder whether that means the new
mount doesn't inherit in the same way it did before.

  mount root ro
  bind /dev to /dev/.static/dev
  mount root rw

Arguably we should just get rid of /dev/.static/dev anyway, since we
utterly don't support a static /dev -- it'd mean that postinsts just
succeeded.

-- 
/dev/.static/dev is mounted ro in intrepid
https://bugs.launchpad.net/bugs/253786
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