The eisa_eeprom_read function in the parisc isa-eeprom component
(drivers/parisc/eisa_eeprom.c) in the Linux kernel before 2.6.31-rc6
allows local users to access restricted memory via a negative ppos
argument, which bypasses a check that assumes that ppos is positive
and causes an out-of-bounds read in the readb function.
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