linux-kernel - Re: [PATCH v2] selftests: seccomp: fix format-zero-length warnings

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Message-ID: <202406100957.750569FFD1@keescook>
Date: Mon, 10 Jun 2024 09:59:08 -0700
From: Kees Cook <kees@...nel.org>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: Amer Al Shanawany <amer.shanawany@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>, Shuah Khan <shuah@...nel.org>,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] selftests: seccomp: fix format-zero-length warnings

On Fri, Jun 07, 2024 at 02:58:47PM -0600, Shuah Khan wrote:
> On 6/7/24 06:41, Amer Al Shanawany wrote:
> > fix the following errors by removing empty print statements:
> > seccomp_benchmark.c:197:24: warning: zero-length gnu_printf format
> >   string [-Wformat-zero-length]
> >    197 |         ksft_print_msg("");
> >        |                        ^~
> > seccomp_benchmark.c:202:24: warning: zero-length gnu_printf format
> >   string [-Wformat-zero-length]
> >    202 |         ksft_print_msg("");
> >        |                        ^~
> > seccomp_benchmark.c:204:24: warning: zero-length gnu_printf format
> >   string [-Wformat-zero-length]
> >    204 |         ksft_print_msg("");
> >        |                        ^~
> > 
> > Reported-by: kernel test robot <lkp@...el.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202312260235.Uj5ug8K9-lkp@intel.com/
> > Signed-off-by: Amer Al Shanawany <amer.shanawany@...il.com>
> > ---
> > Changes v1 -> v2:
> > removed empty print statements
> 
> Kees,
> 
> Is this change okay with you. I didn't see any use for
> these empty ksft_print_msg().
> 
> I will take this patch if you are okay with the change.

Dropping these means that the "#" marks go missing. Currently:

# Running on:
# Linux proton 6.5.0-25-generic #25~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Feb 20 16:09:15 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

with the proposed patch:

# Running on:
Linux proton 6.5.0-25-generic #25~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Feb 20 16:09:15 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

This breaks the TAP syntax for the test, so we should find a different
solution.

Perhaps:

ksft_print_msg("%s", "");

?

-Kees


> 
> > ---
> >   tools/testing/selftests/seccomp/seccomp_benchmark.c | 3 ---
> >   1 file changed, 3 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/seccomp/seccomp_benchmark.c b/tools/testing/selftests/seccomp/seccomp_benchmark.c
> > index b83099160fbc..6fe34be6c693 100644
> > --- a/tools/testing/selftests/seccomp/seccomp_benchmark.c
> > +++ b/tools/testing/selftests/seccomp/seccomp_benchmark.c
> > @@ -194,14 +194,11 @@ int main(int argc, char *argv[])
> >   	ksft_set_plan(7);
> >   	ksft_print_msg("Running on:\n");
> > -	ksft_print_msg("");
> >   	system("uname -a");
> >   	ksft_print_msg("Current BPF sysctl settings:\n");
> >   	/* Avoid using "sysctl" which may not be installed. */
> > -	ksft_print_msg("");
> >   	system("grep -H . /proc/sys/net/core/bpf_jit_enable");
> > -	ksft_print_msg("");
> >   	system("grep -H . /proc/sys/net/core/bpf_jit_harden");
> >   	affinity();
> 
> 
> thanks,
> -- Shuah

-- 
Kees Cook