Re: [PATCH v8 00/11] arm64: Branch Target Identification support

[Mark Brown]

On Mon, Mar 09, 2020 at 09:05:05PM +0000, Mark Brown wrote:
> On Fri, Mar 06, 2020 at 10:27:29AM +0000, Catalin Marinas wrote:

> > Does this series affect uprobes in any way? I.e. can you probe a landing
> > pad?

> You can't probe a landing pad, uprobes on landing pads will be silently
> ignored so the program isn't disrupted, you just don't get the expected
> trace from those uprobes.  This isn't new with the BTI support since
> the landing pads are generally pointer auth instructions, these already
> can't be probed regardless of what's going on with this series.  It's
> already on the list to get sorted.

Sorry, I realized thanks to Amit's off-list prompting that I was testing
that I was verifying with the wrong kernel binary here (user error since
it took me a while to sort out uprobes) so this isn't quite right - you
can probe the landing pads with or without this series.

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