From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: "Will Deacon" <will@kernel.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Paul Elliott" <paul.elliott@arm.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Yu-cheng Yu" <yu-cheng.yu@intel.com>,
"Amit Kachhap" <amit.kachhap@arm.com>,
"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
"Marc Zyngier" <maz@kernel.org>,
"Eugene Syromiatnikov" <esyr@redhat.com>,
"Szabolcs Nagy" <szabolcs.nagy@arm.com>,
"H . J . Lu " <hjl.tools@gmail.com>,
"Andrew Jones" <drjones@redhat.com>,
"Kees Cook" <keescook@chromium.org>,
"Arnd Bergmann" <arnd@arndb.de>, "Jann Horn" <jannh@google.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Kristina Martšenko" <kristina.martsenko@arm.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Florian Weimer" <fweimer@redhat.com>,
"Sudakshina Das" <sudi.das@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v8 00/11] arm64: Branch Target Identification support
Date: Tue, 10 Mar 2020 12:42:26 +0000 [thread overview]
Message-ID: <20200310124226.GC4106@sirena.org.uk> (raw)
In-Reply-To: <20200309210505.GM4101@sirena.org.uk>
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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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next prev parent reply other threads:[~2020-03-10 13:36 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-27 17:44 [PATCH v8 00/11] arm64: Branch Target Identification support Mark Brown
2020-02-27 17:44 ` [PATCH v8 01/11] ELF: UAPI and Kconfig additions for ELF program properties Mark Brown
2020-02-27 17:44 ` [PATCH v8 02/11] ELF: Add ELF program property parsing support Mark Brown
2020-02-27 17:44 ` [PATCH v8 03/11] arm64: Basic Branch Target Identification support Mark Brown
2020-03-11 16:31 ` Catalin Marinas
2020-02-27 17:44 ` [PATCH v8 04/11] elf: Allow arch to tweak initial mmap prot flags Mark Brown
2020-02-27 17:44 ` [PATCH v8 05/11] arm64: elf: Enable BTI at exec based on ELF program properties Mark Brown
2020-02-27 17:44 ` [PATCH v8 06/11] arm64: BTI: Decode BYTPE bits when printing PSTATE Mark Brown
2020-02-27 17:44 ` [PATCH v8 07/11] arm64: unify native/compat instruction skipping Mark Brown
2020-02-27 17:44 ` [PATCH v8 08/11] arm64: traps: Shuffle code to eliminate forward declarations Mark Brown
2020-02-27 17:44 ` [PATCH v8 09/11] arm64: BTI: Reset BTYPE when skipping emulated instructions Mark Brown
2020-02-27 17:44 ` [PATCH v8 10/11] KVM: " Mark Brown
2020-02-27 17:44 ` [PATCH v8 11/11] arm64: mm: Display guarded pages in ptdump Mark Brown
2020-02-28 1:35 ` [PATCH v8 00/11] arm64: Branch Target Identification support Richard Henderson
2020-03-11 19:15 ` Mark Brown
2020-03-06 10:21 ` Catalin Marinas
2020-03-06 10:27 ` Catalin Marinas
2020-03-09 21:05 ` Mark Brown
2020-03-10 12:42 ` Mark Brown [this message]
2020-03-11 16:28 ` Catalin Marinas
2020-03-11 17:25 ` Mark Brown
2020-03-12 18:42 ` Catalin Marinas
2020-03-13 12:59 ` Mark Brown
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