netdev - Re: [PATCH 3/3] checkpatch: add ethtool

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Date: Thu, 26 Oct 2023 11:29:47 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Justin Stitt <justinstitt@...gle.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Shay Agroskin
	<shayagr@...zon.com>, Arthur Kiyanovski <akiyano@...zon.com>, David Arinzon
	<darinzon@...zon.com>, Noam Dagan <ndagan@...zon.com>, Saeed Bishara
	<saeedb@...zon.com>, Rasesh Mody <rmody@...vell.com>, Sudarsana Kalluru
	<skalluru@...vell.com>, <GR-Linux-NIC-Dev@...vell.com>, Dimitris Michailidis
	<dmichail@...gible.com>, Yisen Zhuang <yisen.zhuang@...wei.com>, Salil Mehta
	<salil.mehta@...wei.com>, Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony
 Nguyen <anthony.l.nguyen@...el.com>, Louis Peens <louis.peens@...igine.com>,
	Shannon Nelson <shannon.nelson@....com>, "Brett Creeley"
	<brett.creeley@....com>, <drivers@...sando.io>, "K. Y. Srinivasan"
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu
	<wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, Ronak Doshi
	<doshir@...are.com>, VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
	Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>, "Dwaipayan
 Ray" <dwaipayanray1@...il.com>, Lukas Bulwahn <lukas.bulwahn@...il.com>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, Nick Desaulniers
	<ndesaulniers@...gle.com>, Nathan Chancellor <nathan@...nel.org>, Kees Cook
	<keescook@...omium.org>, <intel-wired-lan@...ts.osuosl.org>,
	<oss-drivers@...igine.com>, <linux-hyperv@...r.kernel.org>
Subject: Re: [PATCH 3/3] checkpatch: add ethtool_sprintf rules

On 10/26/23 01:40, Justin Stitt wrote:
> Add some warnings for using ethtool_sprintf() where a simple
> ethtool_puts() would suffice.
> 
> The two cases are:
> 
> 1) Use ethtool_sprintf() with just two arguments:
> |       ethtool_sprintf(&data, driver[i].name);
> or
> 2) Use ethtool_sprintf() with a standalone "%s" fmt string:
> |       ethtool_sprintf(&data, "%s", driver[i].name);
> 
> The former may cause -Wformat-security warnings while the latter is just
> not preferred. Both are safely in the category of warnings, not errors.
> 
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> ---
>   scripts/checkpatch.pl | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 7d16f863edf1..1ba9ce778746 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -7020,6 +7020,19 @@ sub process {
>   			     "Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: https://github.com/KSPP/linux/issues/90\n" . $herecurr);
>   		}
>   
> +# ethtool_sprintf uses that should likely be ethtool_puts
> +		if (   $line =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/   ) {

no need for whitespace right after opening parenthesis, same at the end

Does it work for ethtool_sprintf(calls broken
				 into multiple lines)?

BTW, I really like this series!

> +			WARN("ETHTOOL_SPRINTF",
> +			     "Prefer ethtool_puts over ethtool_sprintf with only two arguments" . $herecurr);
> +		}
> +
> +		# use $rawline because $line loses %s via sanitization and thus we can't match against it.
> +		if (   $rawline =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*\"\%s\"\s*,\s*$FuncArg\s*\)/   ) {
> +			WARN("ETHTOOL_SPRINTF2",
> +			     "Prefer ethtool_puts over ethtool_sprintf with standalone \"%s\" specifier" . $herecurr);
> +		}
> +
> +
>   # typecasts on min/max could be min_t/max_t
>   		if ($perl_version_ok &&
>   		    defined $stat &&
>