arm: kprobes: Allow to handle reentered kprobe on single-stepping

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This is arm port of commit 6a5022a56a ("kprobes/x86: Allow to
handle reentered kprobe on single-stepping")

Since the FIQ handlers can interrupt in the single stepping
(or preparing the single stepping, do_debug etc.), we should
consider a kprobe is hit in the NMI handler. Even in that
case, the kprobe is allowed to be reentered as same as the
kprobes hit in kprobe handlers
(KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE).

The real issue will happen when a kprobe hit while another
reentered kprobe is processing (KPROBE_REENTER), because
we already consumed a saved-area for the previous kprobe.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jon Medhurst <tixy@linaro.org>

...

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Masami Hiramatsu 2017-02-14 00:03:38 +09:00 • committed by Jon Medhurst

parent 4495c08e84

commit f3fbd7ec62

1 changed files with 6 additions and 0 deletions

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arch/arm/probes/kprobes/core.c

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