From: Kees Cook <kees@kernel.org>
To: Bill Wendling <morbo@google.com>
Cc: linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Justin Stitt <justinstitt@google.com>,
linux-hardening@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH 0/2] Add __counted_by_ptr macro
Date: Fri, 21 Nov 2025 15:25:30 -0800 [thread overview]
Message-ID: <202511211517.539CD58@keescook> (raw)
In-Reply-To: <20251121193957.1655580-1-morbo@google.com>
On Fri, Nov 21, 2025 at 07:39:42PM +0000, Bill Wendling wrote:
> These patches add the __counted_by_ptr macro and then uses it in
> mm/memblock.h. The name of the __counted_by_ptr attribute is the same as
> __counted_by, but two different macros are needed, because of feature
> skew in GCC and clang. Once the minmum versions of the compilers support
> 'counted_by' on both flexible array members and pointers in structs,
> this macro will become obsolete.
>
> Bill Wendling (2):
> Compiler Attributes: Add __counted_by_ptr macro
> memblock: annotate struct memblock_type with __counted_by_ptr
Based on this[1] thread, I think we'll need to wait for GCC and Clang to
release with the "void *" support first, and then push the counted_by up
to that version to cover flexible arrays, pointers, and void *.
-Kees
[1] https://lore.kernel.org/lkml/20251021095447.GL3245006@noisy.programming.kicks-ass.net/
-Kees
--
Kees Cook
next prev parent reply other threads:[~2025-11-21 23:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-21 19:39 [PATCH 0/2] Add __counted_by_ptr macro Bill Wendling
2025-11-21 19:39 ` [PATCH 1/2] Compiler Attributes: " Bill Wendling
2025-11-21 19:46 ` Bill Wendling
2025-11-21 19:54 ` [PATCH v2 " Bill Wendling
2025-11-21 21:47 ` Miguel Ojeda
2025-11-24 20:01 ` Bill Wendling
2025-11-21 19:39 ` [PATCH 2/2] memblock: annotate struct memblock_type with __counted_by_ptr Bill Wendling
2025-11-22 0:30 ` Kees Cook
2025-11-22 22:16 ` Andrew Morton
2025-11-24 19:19 ` Kees Cook
2025-11-24 20:15 ` Bill Wendling
2025-11-21 23:25 ` Kees Cook [this message]
2025-11-24 20:05 ` [PATCH 0/2] Add __counted_by_ptr macro Bill Wendling
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