linux-kernel - Re: [PATCH v1 1/1] gpiolib: cdev: Annotate struct linereq with __counted

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Message-ID: <202309251016.DEC84A52@keescook>
Date:   Mon, 25 Sep 2023 10:17:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andy Shevchenko <andy@...nel.org>
Cc:     Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Subject: Re: [PATCH v1 1/1] gpiolib: cdev: Annotate struct linereq with
 __counted_by()

On Mon, Sep 25, 2023 at 09:54:34AM +0300, Andy Shevchenko wrote:
> On Mon, Sep 18, 2023 at 12:15:53PM +0300, Andy Shevchenko 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).
> 
> Kees' patch is better, please ignore this one.

Oh! I didn't get CCed so I didn't know you'd sent this. :)

Thanks for taking the initiative on this, though! (But, yes,
initialization order matters.)

-- 
Kees Cook