linux-kernel - Re: [PATCH] usb: gadget: f_midi: Annotate struct f_midi with __counted

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Message-Id: <169601526970.3013632.470911371867487341.b4-ty@chromium.org>
Date:   Fri, 29 Sep 2023 12:21:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>
Cc:     John Keeping <john@...ping.me.uk>, Peter Chen <peter.chen@....com>,
        Hulk Robot <hulkci@...wei.com>,
        Allen Pais <allen.lkml@...il.com>,
        Will McVicker <willmcvicker@...gle.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-usb@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Linyu Yuan <quic_linyyuan@...cinc.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: f_midi: Annotate struct f_midi with __counted_by

On Fri, 15 Sep 2023 12:59:39 -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 f_midi.
> 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] usb: gadget: f_midi: Annotate struct f_midi with __counted_by
      https://git.kernel.org/kees/c/cfe2af2d553f

Take care,

-- 
Kees Cook