linux-kernel - Re: [PATCH] md/md-linear: Annotate struct linear_conf with __counted

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Message-Id: <169601526973.3013632.16756928162777602693.b4-ty@chromium.org>
Date:   Fri, 29 Sep 2023 12:21:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Song Liu <song@...nel.org>, Kees Cook <keescook@...omium.org>
Cc:     linux-raid@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] md/md-linear: Annotate struct linear_conf with __counted_by

On Fri, 15 Sep 2023 13:03:28 -0700, Kees Cook 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 checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct linear_conf.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] md/md-linear: Annotate struct linear_conf with __counted_by
      https://git.kernel.org/kees/c/9add7681e09b

Take care,

-- 
Kees Cook