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Message-ID: <20231025-ethtool_puts_impl-v1-3-6a53a93d3b72@google.com> Date: Wed, 25 Oct 2023 23:40:34 +0000 From: Justin Stitt <justinstitt@...gle.com> To: "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, Justin Stitt <justinstitt@...gle.com> Subject: [PATCH 3/3] checkpatch: add ethtool_sprintf rules 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*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/ ) { + 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 && -- 2.42.0.758.gaed0368e0e-goog
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