From Mandriva Community Wiki

[edit] Simple standard use (need floppy)

To use a patch.pl, you must copy the appropriate patch onto a floppy disk (fat or ext2), with the name patch.pl. Then you can boot off of your CD-ROM with the "patch" command at the boot prompt (obtained by pressing F1 at the splash screen), and making sure that the floppy containing the patch is in the floppy disk drive. If you boot off of floppy instead of the CD-ROM, copy the patch.pl onto your boot floppy and boot off of the floppy with the "patch" command at the boot prompt.

[edit] Modify the mirror

If you install using your own mirror, you can put patch.pl into install/patch-oem.pl: it will be taken into account automatically.