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

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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