x86: Barf when vmalloc and kmemcheck faults happen in NMI

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In x86, faults exit by executing the iret instruction, which then
reenables NMIs if we faulted in NMI context. Then if a fault
happens in NMI, another NMI can nest after the fault exits.

But we don't yet support nested NMIs because we have only one NMI
stack. To prevent from that, check that vmalloc and kmemcheck
faults don't happen in this context. Most of the other kernel faults
in NMIs can be more easily spotted by finding explicit
copy_from,to_user() calls on review.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>

...

This commit is contained in:

Frederic Weisbecker 2010-09-27 18:50:51 +02:00

parent 14cae9bd2f

commit ebc8827f75

2 changed files with 6 additions and 0 deletions

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4

arch/x86/mm/fault.c

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2

arch/x86/mm/kmemcheck/kmemcheck.c

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