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swicth
2012 Nov 21
3
Reentrant NMIs, MCEs and interrupt stack tables.
Hello,
While working on a fix for the rare-but-possible problem of reentrant
NMIs and MCEs, I have discovered that it is sadly possible to generate
fake NMIs and MCEs which will run the relevant handlers on the relevant
stacks, without invoking any of the other CPU logic for these special
interrupts.
A fake NMI can be generated by a processor in PIC mode as opposed to
Virtual wire mode, with a