linux-kernel - Re: [PATCH 1/2] gcc-plugins: structleak: Generalize to all variable types

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Date:   Mon, 4 Mar 2019 09:32:41 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Emese Revfy <re.emese@...il.com>,
        Alexander Popov <alex.popov@...ux.com>,
        Laura Abbott <labbott@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 1/2] gcc-plugins: structleak: Generalize to all variable types

On Sat, Mar 2, 2019 at 2:16 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Sat, Mar 2, 2019 at 4:43 PM Kees Cook <keescook@...omium.org> wrote:
> >
> > On Sat, Mar 2, 2019 at 1:05 AM Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> > >
> > > On Thu, 28 Feb 2019 at 21:27, Arnd Bergmann <arnd@...db.de> wrote:
> > > > I get similar results with asan-stack=1 but without your plugin, only
> > > > the combination of the two has the explosive stack size growth.
> >
> > I can look more closely, but I'm not sure it's entirely worth it:
> > these two may not make sense to build at the same time. (e.g. the
> > use-after-scope config was disallowed to work with this plugin.)
>
> Well, I still want to make sure all 'randconfig' builds complete without
> warnings, and without having to turn off the otherwise useful
> stack overflow warnings.
>
> One thing I noticed is that your patch removes the 'depends on
> !COMPILE_TEST' check for GCC_PLUGIN_STRUCTLEAK_BYREF_ALL,
> so if we add that back in, it would at least take care of the
> allmodconfig and randconfig cases.

Okay, I'll add this back in the next few days.

-- 
Kees Cook