linux-kernel - Re: [PATCH v8 33/38] kselftest/arm64: Add a GCS test program built with the system libc

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Message-ID: <084d97c0-a84c-49e1-a1e2-d864dbfcce0e@sirena.org.uk>
Date: Wed, 21 Feb 2024 19:20:11 +0000
From: Mark Brown <broonie@...nel.org>
To: Thiago Jung Bauermann <thiago.bauermann@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Arnd Bergmann <arnd@...db.de>, Oleg Nesterov <oleg@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>, Shuah Khan <shuah@...nel.org>,
	"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
	Szabolcs Nagy <Szabolcs.Nagy@....com>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Florian Weimer <fweimer@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v8 33/38] kselftest/arm64: Add a GCS test program built
 with the system libc

On Mon, Feb 19, 2024 at 11:15:57PM -0300, Thiago Jung Bauermann wrote:

> The only issue as can be seen above is that the can_call_function test
> is failing. The child is getting a GCS Segmentation fault when returning
> from fork().

> I tried debugging it with GDB, but I don't see what's wrong since the
> address in LR matches the first entry in GCSPR. Here is the
> debug session:

I'm simply not seeing this in my testing.  There's *something* going on
somewhere, I had another report of a similarish thing elsewhere, but not
in any way that I've ever been able to reproduce.  It smells like there
might be something missing with the page tables...

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