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4ce8f664ad
busybox sha256sum will create a checksum file for uncommon file names (e.g. /boot/foo"$\n"bar), but fail to verify that exact file. https://bugs.busybox.net/show_bug.cgi?id=14226 Thus disallow all files in /boot/ with strange file names at the time of signing for now. Verifying in the presence of new files with such file names in /boot/ is no issue for the kexec_tree verification due to the previously implemented escaping mechanism.