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Date: Tue, 23 Jan 2024 02:45:45 +0100
From: David Sterba <dsterba@suse.cz>
To: Kees Cook <keescook@chromium.org>
Cc: linux-hardening@vger.kernel.org, Chris Mason <clm@fb.com>,
	Josef Bacik <josef@toxicpanda.com>, David Sterba <dsterba@suse.com>,
	linux-btrfs@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/82] btrfs: Refactor intentional wrap-around calculation
Message-ID: <20240123014545.GH31555@twin.jikos.cz>
Reply-To: dsterba@suse.cz
References: <20240122235208.work.748-kees@kernel.org>
 <20240123002814.1396804-13-keescook@chromium.org>
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On Mon, Jan 22, 2024 at 04:26:48PM -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 unsigned wrap-around addition test to use
> check_add_overflow(), retaining the result for later usage (which removes
> the redundant open-coded addition). This paves the way to enabling the
> wrap-around sanitizer 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: Chris Mason <clm@fb.com>
> Cc: Josef Bacik <josef@toxicpanda.com>
> Cc: David Sterba <dsterba@suse.com>
> Cc: linux-btrfs@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Acked-by: David Sterba <dsterba@suse.com>