linux-kernel - Re: [PATCH 01/82] overflow: Expand check_add

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Message-ID: <202401261456.3D126A50D7@keescook>
Date: Fri, 26 Jan 2024 14:57:30 -0800
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: linux-hardening@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>, llvm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/82] overflow: Expand check_add_overflow() for pointer
 addition

On Fri, Jan 26, 2024 at 10:52:57PM +0000, Justin Stitt wrote:
> [...]
> >  /**
> >   * check_sub_overflow() - Calculate subtraction with overflow checking
> 
> Does check_sub_overflow() deserve some more love in the future? I
> imagine "under"-flowing pointers is not at all common, though.

Yes, though I hadn't found any cases of it yet in the code, so I didn't
want to add a helper that would go unused. :)

> Nonetheless, this all looks good to me.
> 
> Reviewed-by: Justin Stitt <justinstitt@...gle.com>

Thanks!

-- 
Kees Cook