The last time I filed a Linux kernel bug report, it was to report that you could plug in a Firewire cable and directly read or write memory, which is a security bug.
But only the first 4GB of memory, because the bug that allowed this was from the 32-bit days. There's are registers which set the upper and lower limits of the accessible area, and they were set for a range of 0..0xffffffff.
Loud complaints from someone who had a debugger which used that exploit. Wasn't fixed.
Loud complaints from someone who had a debugger which used that exploit. Wasn't fixed.