linux-hardening - Re: [PATCH 0/3] string.h: Use ARRAY

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Message-ID: <202502061050.EC48F506B1@keescook>
Date: Thu, 6 Feb 2025 10:52:18 -0800
From: Kees Cook <kees@...nel.org>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Andy Shevchenko <andy@...nel.org>,
	Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	Miguel Ojeda <ojeda@...nel.org>, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 0/3] string.h: Use ARRAY_SIZE() for
 memtostr*()/strtomem*()

On Thu, Feb 06, 2025 at 08:45:41PM +0200, Andy Shevchenko wrote:
> On Thu, Feb 6, 2025 at 8:44 PM Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> > On Thu, Feb 6, 2025 at 7:42 PM Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:
> > >
> > > What's the minimum Clang version we build kernel with? 12?
> >
> > 13.0.1 for most architectures according to `scripts/min-tool-version.sh`.
> 
> Okay, does it mean 13 has no such a bug?

It probably did, but Clang 13 didn't support compile-time error messages
(added in 14). Regardless, this fixes it there and makes the API more
robust.

> Otherwise the commit message and other comments might be clearer...

How should I rephrase things? I mention the bug and when it was fixed
in patch 3:

  ...
  benefit of working around a bug in Clang (fixed[1] in 15+) that got
  ...

-Kees

-- 
Kees Cook