In live cd, I managed to mount /boot, and nm'ed all /boot/grub/i386-pc/*.mod files
The following files contain "U grub_file_filters":
gzio.mod lzopio.mod offsetio.mod verifiers.mod xzio.mod
In live cd, I managed to mount /boot, and nm'ed all /boot/grub/ i386-pc/ *.mod files
The following files contain "U grub_file_filters":
gzio.mod
lzopio.mod
offsetio.mod
verifiers.mod
xzio.mod