Canonicalizing rw/ro paths in the config layer resolved symlinks before
the sandbox was built, so a symlinked entry only appeared at its
target's location -- never at the path the user wrote. Stop
canonicalizing rw/ro at the config layer and instead resolve only the
source side of the bind in sandbox.rs.
Whitelist mode's implicit bwrap root was a writable tmpfs, letting the
sandboxed process create files and directories anywhere not covered by
an explicit ro mount. This was not an issue in blacklist mode due to
--ro-bind / / covering that case.
This patch adds --remount-ro / before any other mount to make the base
layer read-only in both modes.
Glob results within a SENSITIVE_PATHS entry could return files before
their parent directory. When that happens the file gets a null-bind
while its siblings remain visible, because the parent hasn't been added
to tmpfs_dirs yet. Sorting dirs first removes this implicit ordering
dependency.
