linux-kernel - Re: [PATCH] structleak: disable BYREF_ALL in combination with KASAN

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Date:   Fri, 21 Jun 2019 11:43:58 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Alexander Popov <alex.popov@...ux.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] structleak: disable BYREF_ALL in combination with KASAN_STACK

On Thu, Jun 20, 2019 at 7:36 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Tue, Jun 18, 2019 at 11:47:13AM +0200, Arnd Bergmann wrote:
> > The combination of KASAN_STACK and GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
> > leads to much larger kernel stack usage, as seen from the warnings
> > about functions that now exceed the 2048 byte limit:
>
> Is the preference that this go into v5.2 (there's not much time left),
> or should this be v5.3? (You didn't mark it as Cc: stable?)

Having it in 5.2 would be great. I had not done much build testing in the last
months, so I didn't actually realize that your patch was merged a while ago
rather than only in linux-next.

BTW, I have now run into a small number of files that are still affected
by a stack overflow warning from STRUCTLEAK_BYREF_ALL. I'm trying
to come up with patches for those as well, we can probably do it in a way
that also improves the affected drivers. I'll put you on Cc when I
find another one.

      Arnd