linux-hardening - Re: [GIT PULL] hardening updates for v6.5-rc1

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Date:   Tue, 27 Jun 2023 23:20:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Lobakin <aleksander.lobakin@...el.com>,
        Alexander Potapenko <glider@...gle.com>,
        Alex Deucher <alexander.deucher@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Arne Welzel <arne.welzel@...elight.com>,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        Bill Wendling <morbo@...gle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fangrui Song <maskray@...gle.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>, Jan Kara <jack@...e.cz>,
        Joe Perches <joe@...ches.com>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        John Stultz <jstultz@...gle.com>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Marco Elver <elver@...gle.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Simon Horman <simon.horman@...igine.com>,
        Song Liu <song@...nel.org>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>,
        Wyes Karny <wyes.karny@....com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [GIT PULL] hardening updates for v6.5-rc1

On Tue, Jun 27, 2023 at 05:34:57PM -0700, Kees Cook wrote:
> - The under-development compiler attribute __counted_by has been added
>   so that we can start annotating flexible array members with their
>   associated structure member that tracks the count of flexible array
>   elements at run-time. It is possible (likely?) that the exact syntax
>   of the attribute will change before it is finalized, but GCC and Clang
>   are working together to sort it out. Any changes can be made to the
>   macro while we continue to add annotations. As an example, I have a
>   treewide commit waiting with such annotations found via Coccinelle:
>   https://git.kernel.org/linus/adc5b3cb48a049563dc673f348eab7b6beba8a9b
>   See commit dd06e72e68bcb4070ef211be100d2896e236c8fb for more details.

So I've been following the discussion of that feature for clang and
I can't wait to actually be able to use it.

But this feels a bit premature to me, not only due to the ongoing
discussions on the syntax, but more importantly because I fear it
will be completely misued before we have a compiler actually supporting
available widely enough that we have it in the usual test bots.