On Mon, 12 Apr 2021 17:41:01 +0800, Jisheng Zhang wrote:
> If instruction being single stepped caused a page fault, the kprobes
> is cancelled to let the page fault handler continue as a normal page
> fault. But the local irqflags are disabled so cpu will restore pstate
> with DAIF masked. After pagefault is serviced, the kprobes is
> triggerred again, we overwrite the saved_irqflag by calling
> kprobes_save_local_irqflag(). NOTE, DAIF is masked in this new saved
> irqflag. After kprobes is serviced, the cpu pstate is retored with
> DAIF masked.
>
> [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: kprobes: Restore local irqflag if kprobes is cancelled
https://git.kernel.org/arm64/c/738fa58ee132
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
