arm64: kprobes: Fix overflow when saving stack

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The MIN_STACK_SIZE macro tries evaluate how much stack space needs
to be saved in the jprobes_stack array, sized at 128 bytes.

When using the IRQ stack, said macro can happily return up to
IRQ_STACK_SIZE, which is 16kB. Mayhem follows.

This patch fixes things by getting rid of the crazy macro and
limiting the copy to be at most the size of the jprobes_stack
array, no matter which stack we're on.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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This commit is contained in:

Marc Zyngier 2016-07-20 17:46:58 +01:00 • committed by Catalin Marinas

parent 44bd887ce1

commit ab4c1325d4

1 changed files with 14 additions and 8 deletions

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arch/arm64/kernel/probes/kprobes.c

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