Re: [PATCH v3 1/7] selftests/resctrl: Fix uninitialized .sa_flags

[Ilpo Järvinen]

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@xxxxxxxxx>
> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
> > Cc: <stable@xxxxxxxxxxxxxxx>
> > ---
> >  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.