linux-hardening - Re: [PATCH] comedi: Annotate struct comedi_lrange with __counted

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Date: Mon, 2 Oct 2023 00:36:28 -0700
From: Kees Cook <keescook@...omium.org>
To: Julia Lawall <julia.lawall@...ia.fr>
Cc: Kees Cook <kees@...nel.org>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, linux-hardening@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH] comedi: Annotate struct comedi_lrange with __counted_by

On Mon, Oct 02, 2023 at 07:38:42AM +0200, Julia Lawall wrote:
> The sizeof with an expression argument is treated differently than the
> sizeof with a type argument.  So you need to write:
> 
> @allocated@
> identifier STRUCT, ARRAY;
> expression COUNT;
> struct STRUCT *PTR;
> identifier ALLOC;
> type ELEMENT_TYPE;
> @@
> 
>         PTR = ALLOC(..., \(sizeof(*PTR)\|sizeof(struct STRUCT)\) +
>                          COUNT * \(sizeof(*PTR->ARRAY)\|sizeof(PTR->ARRAY[0])\|sizeof(ELEMENT_TYPE)\), ...);

Ah! Thank you thank you! Yes, this works great now. :)

-- 
Kees Cook