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Date:   Mon, 2 Oct 2023 12:46:35 +0300 (EEST)
From:   =?ISO-8859-15?Q?Ilpo_J=E4rvinen?= <ilpo.jarvinen@linux.intel.com>
To:     Reinette Chatre <reinette.chatre@intel.com>
cc:     linux-kselftest@vger.kernel.org, Shuah Khan <shuah@kernel.org>,
        =?ISO-8859-15?Q?Maciej_Wiecz=F3r-Retman?= 
        <maciej.wieczor-retman@intel.com>,
        Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>,
        LKML <linux-kernel@vger.kernel.org>, stable@vger.kernel.org
Subject: Re: [PATCH v3 1/7] selftests/resctrl: Fix uninitialized .sa_flags
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Message-ID: <545ef67c-4ca2-9a2-381a-991fda391e8e@linux.intel.com>
References: <20230929112039.7488-1-ilpo.jarvinen@linux.intel.com> <20230929112039.7488-2-ilpo.jarvinen@linux.intel.com> <0df7f82d-de3b-3e51-ffc1-5aa4e23db62a@intel.com>
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On Fri, 29 Sep 2023, Reinette Chatre wrote:

> Hi Ilpo,
> 
> On 9/29/2023 4:20 AM, Ilpo Järvinen wrote:
> > signal_handler_unregister() calls sigaction() with uninitializing
> > sa_flags in the struct sigaction.
> > 
> > Make sure sa_flags is always initialized in signal_handler_unregister()
> > by initializing the struct sigaction when declaring it.
> > 
> > Fixes: 73c55fa5ab55 (selftests/resctrl: Commonize the signal handler register/unregister for all tests)
> 
> Please place the title line in quotes (checkpatch warning).

Thanks. I hadn't realize the quotes vanished without an error when I 
removed the escape from " char in gitconfig alias (I have just migrated to 
use alias instead of a custom tool).

> > Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> > Cc: <stable@vger.kernel.org>
> > ---
> >  tools/testing/selftests/resctrl/resctrl_val.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
> > index 51963a6f2186..1e8b90077218 100644
> > --- a/tools/testing/selftests/resctrl/resctrl_val.c
> > +++ b/tools/testing/selftests/resctrl/resctrl_val.c
> > @@ -504,7 +504,7 @@ int signal_handler_register(void)
> >   */
> >  void signal_handler_unregister(void)
> >  {
> > -	struct sigaction sigact;
> > +	struct sigaction sigact = {};
> >  
> >  	sigact.sa_handler = SIG_DFL;
> >  	sigemptyset(&sigact.sa_mask);
> 
> Could you please add this initialization to signal_handler_register()
> also? I understand that the particular issue of sa_flags is not 
> relevant to that function but there are other uninitialized fields.
> I think initializing the struct makes the code more robust without
> needing to reason/understand glibc behavior.

Okay, I'll do that and add a note into the changelog that then correctness 
is obvious from the code itself.

-- 
 i.

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