linux-hardening - Re: [PATCH] i2c: mux: demux-pinctrl: Annotate struct i2c_demux_pinctrl_priv with __counted

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Message-ID: <ZRChVwlTcBIMGk95@shikoro>
Date: Sun, 24 Sep 2023 22:51:35 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Kees Cook <keescook@...omium.org>
Cc: Peter Rosin <peda@...ntia.se>, linux-i2c@...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] i2c: mux: demux-pinctrl: Annotate struct
 i2c_demux_pinctrl_priv with __counted_by

On Fri, Sep 22, 2023 at 10:49:59AM -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 i2c_demux_pinctrl_priv.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Cc: Peter Rosin <peda@...ntia.se>
> Cc: linux-i2c@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Fixed a blank line and applied to for-next, thanks!


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