Re: [PATCH v4 10/17] arm64: disable kretprobes with SCS

Mark Rutland
2019-11-05T20:50:17Z

On Mon, Nov 04, 2019 at 03:42:09PM -0800, Sami Tolvanen wrote:
> On Mon, Nov 4, 2019 at 9:05 AM Mark Rutland <mark.rutland@arm.com> wrote:
> > I'm a bit confused as to why that's the case -- could you please
> > elaborate on how this is incompatible?
> >
> > IIUC kretrobes works by patching the function entry point with a BRK, so
> > that it can modify the LR _before_ it is saved to the stack. I don't see
> > how SCS affects that.
>
> You're correct. While this may not be optimal for reducing attack
> surface, I just tested this to confirm that there's no functional
> conflict. I'll drop this and related patches from v5.

Great; thanks for confirming!

Mark.