Follow-up Comment #1, bug #42635 (project grub): May be a problem when using btrfs with lzo compression. But it's unlikely. If attacker can write to files used by GRUB, you have a bigger problems. In cases when signatures used (if disk replacement is a possible attack scenario), the signatures are checked before the decompression, so not a problem either. Nevertheless, I'll correct the mistake, thank you for forwarding this.
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