Messages in this thread | | | Date | Fri, 9 Jan 2015 16:46:08 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH] arm: Remove early stack deallocation from restore_user_regs |
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On Mon, Jan 05, 2015 at 03:12:38PM +0000, Daniel Thompson wrote: > Currently restore_user_regs deallocates the SVC stack early in > its execution and relies on no exception being taken between > the deallocation and the registers being restored. The introduction > of a default FIQ handler that also uses the SVC stack breaks this > assumption and can result in corrupted register state. > > This patch works around the problem by removing the early > stack deallocation and using r2 as a temporary instead. I have > not found a way to do this without introducing an extra mov > instruction to the macro. > > Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> > ---
Please put it in the patch system, thanks. I think we should queue this one for stable too, as I think we need this for v3.18 (as a result of c0e7f7ee717e2b4c5791e7422424c96b5008c39e, ARM: 8150/3: fiq: Replace default FIQ handler)?
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