linux-kernel - Re: [PATCH 42/82] bcachefs: Refactor intentional wrap-around test

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Message-ID: <lzb2gaizubakkhf5zqozshnt4ivghyg4sddxwrn46hroozacdc@lcctrys76hys>
Date: Tue, 23 Jan 2024 01:36:50 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Kees Cook <keescook@...omium.org>
Cc: linux-hardening@...r.kernel.org, Brian Foster <bfoster@...hat.com>, 
	linux-bcachefs@...r.kernel.org, "Gustavo A. R. Silva" <gustavoars@...nel.org>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 42/82] bcachefs: Refactor intentional wrap-around test

On Mon, Jan 22, 2024 at 04:27:17PM -0800, Kees Cook wrote:
> In an effort to separate intentional arithmetic wrap-around from
> unexpected wrap-around, we need to refactor places that depend on this
> kind of math. One of the most common code patterns of this is:
> 
> 	VAR + value < VAR
> 
> Notably, this is considered "undefined behavior" for signed and pointer
> types, which the kernel works around by using the -fno-strict-overflow
> option in the build[1] (which used to just be -fwrapv). Regardless, we
> want to get the kernel source to the position where we can meaningfully
> instrument arithmetic wrap-around conditions and catch them when they
> are unexpected, regardless of whether they are signed[2], unsigned[3],
> or pointer[4] types.
> 
> Refactor open-coded wrap-around addition test to use add_would_overflow().
> This paves the way to enabling the wrap-around sanitizers in the future.
> 
> Link: https://git.kernel.org/linus/68df3755e383e6fecf2354a67b08f92f18536594 [1]
> Link: https://github.com/KSPP/linux/issues/26 [2]
> Link: https://github.com/KSPP/linux/issues/27 [3]
> Link: https://github.com/KSPP/linux/issues/344 [4]
> Cc: Kent Overstreet <kent.overstreet@...ux.dev>
> Cc: Brian Foster <bfoster@...hat.com>
> Cc: linux-bcachefs@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Kent Overstreet <kent.overstreet@...ux.dev>