Re: [PATCH v2 00/16] Remove uninitialized_var() macro

Kees Cook
2020-06-20T15:57:14Z

On Sat, Jun 20, 2020 at 09:03:34AM +0200, Sedat Dilek wrote:
> On Sat, Jun 20, 2020 at 5:30 AM Kees Cook <keescook@chromium.org> wrote:
> >
> > v2:
> > - more special-cased fixes
> > - add reviews
> > v1: https://lore.kernel.org/lkml/20200603233203.1695403-1-keescook@chromium.org
> >
> > Using uninitialized_var() is dangerous as it papers over real bugs[1]
> > (or can in the future), and suppresses unrelated compiler warnings
> > (e.g. "unused variable"). If the compiler thinks it is uninitialized,
> > either simply initialize the variable or make compiler changes.
> >
> > As recommended[2] by[3] Linus[4], remove the macro.
> >
> > Most of the 300 uses don't cause any warnings on gcc 9.3.0, so they're in
> > a single treewide commit in this series. A few others needed to actually
> > get cleaned up, and I broke those out into individual patches.
> >
> > The tree is:
> > https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=kspp/uninit/macro
> >
> > -Kees
> >
>
> Hi Kees,
>
> thanks for doing a v2 of your patchset.
>
> As I saw Jason Yan providing some "uninitialized_var() macro" patches
> to the MLs I pointen him to your tree "v1".

Thanks!

> BTW, I have tested your "v1" against Linux v5.7 (see [1]) - just
> yesterday with Linux v5.7.5-rc1.
>
> Is it possible to have a v2 of this patchset on top od Linux v5.7 - if
> you do not mind.

Since it's only going to be for post-v5.8, I'm fine skipping the v5.7
testing. Mainly I'm looking at v5.8 and linux-next.

Thanks for looking at it!

--
Kees Cook