linux-kernel - Re: [PATCH 33/33] kselftest/riscv: kselftest for user mode cfi

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Message-ID: <b4347055-46f7-4e06-b484-bbf147b80fe4@sirena.org.uk>
Date: Thu, 3 Oct 2024 12:03:11 +0100
From: Mark Brown <broonie@...nel.org>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: Deepak Gupta <debug@...osinc.com>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Conor Dooley <conor@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Christian Brauner <brauner@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
	alistair.francis@....com, richard.henderson@...aro.org,
	jim.shu@...ive.com, andybnac@...il.com, kito.cheng@...ive.com,
	charlie@...osinc.com, atishp@...osinc.com, evan@...osinc.com,
	cleger@...osinc.com, alexghiti@...osinc.com,
	samitolvanen@...gle.com, rick.p.edgecombe@...el.com
Subject: Re: [PATCH 33/33] kselftest/riscv: kselftest for user mode cfi

On Wed, Oct 02, 2024 at 05:18:36PM -0600, Shuah Khan wrote:
> On 10/1/24 10:06, Deepak Gupta wrote:

> > +#ifndef __NR_prctl
> > +#define __NR_prctl 167
> > +#endif

> > +#ifndef __NR_map_shadow_stack
> > +#define __NR_map_shadow_stack 453

> Why do we need to define these? Shouldn't including
> asm-generic/unistd.h sufficient?

We have this issue on arm64 as well, there's some issue with directly
pulling in the asm header interfering with libc in some situation (I
can't immediately figure out which situation or which libc to remind
myself what it is though...) so we've got local defines like we do for
the NT_ defines for ptrace.  I see x86 is doing the same.

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