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

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Message-ID: <20200310124226.GC4106@sirena.org.uk>
Date:   Tue, 10 Mar 2020 12:42:26 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Paul Elliott <paul.elliott@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marc Zyngier <maz@...nel.org>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        "H . J . Lu " <hjl.tools@...il.com>,
        Andrew Jones <drjones@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Kristina Martšenko <kristina.martsenko@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Florian Weimer <fweimer@...hat.com>,
        Sudakshina Das <sudi.das@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v8 00/11] arm64: Branch Target Identification support

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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