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Date: Fri, 9 Feb 2024 23:13:28 -0800
From: Kees Cook <keescook@chromium.org>
To: Lee Jones <lee@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	support@areca.com.tw, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 10/10] scsi: arcmsr: Remove snprintf() from sysfs
 call-backs and replace with sysfs_emit()
Message-ID: <202402092313.DF1409889@keescook>
References: <20240208084512.3803250-1-lee@kernel.org>
 <20240208084512.3803250-11-lee@kernel.org>
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In-Reply-To: <20240208084512.3803250-11-lee@kernel.org>

On Thu, Feb 08, 2024 at 08:44:22AM +0000, Lee Jones wrote:
> Since snprintf() has the documented, but still rather strange trait of
> returning the length of the data that *would have been* written to the
> array if space were available, rather than the arguably more useful
> length of data *actually* written, it is usually considered wise to use
> something else instead in order to avoid confusion.
> 
> In the case of sysfs call-backs, new wrappers exist that do just that.
> 
> Link: https://lwn.net/Articles/69419/
> Link: https://github.com/KSPP/linux/issues/105
> Signed-off-by: Lee Jones <lee@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook