linux-kernel - Re: [PATCH][next] atags_proc: Add __counted_by for struct buffer and use struct

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Message-Id: <170154914064.179444.11376018592445133931.b4-ty@chromium.org>
Date:   Sat,  2 Dec 2023 12:32:23 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Russell King <linux@...linux.org.uk>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] atags_proc: Add __counted_by for struct buffer and use struct_size()

On Tue, 10 Oct 2023 06:46:50 -0600, Gustavo A. R. Silva wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> While there, use struct_size() helper, instead of the open-coded
> version, to calculate the size for the allocation of the whole
> flexible structure, including of course, the flexible-array member.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] atags_proc: Add __counted_by for struct buffer and use struct_size()
      https://git.kernel.org/kees/c/ac7110d883ff

Take care,

-- 
Kees Cook