linux-kernel - Re: [PATCH 02/11] x86: tboot: avoid Wstringop-overread-warning

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Message-ID: <CAK8P3a10d8hgBiO5W=34oLqw8m22=Xi4C=MxVSY_fGnXZUJ3iA@mail.gmail.com>
Date:   Mon, 22 Mar 2021 22:39:47 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Martin Sebor <msebor@....gnu.org>,
        Ning Sun <ning.sun@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Simon Kelley <simon@...kelleys.org.uk>,
        James Smart <james.smart@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Anders Larsen <al@...rsen.net>, Tejun Heo <tj@...nel.org>,
        Serge Hallyn <serge@...lyn.com>,
        Imre Deak <imre.deak@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        tboot-devel@...ts.sourceforge.net,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        ath11k@...ts.infradead.org,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH 02/11] x86: tboot: avoid Wstringop-overread-warning

On Mon, Mar 22, 2021 at 9:29 PM Ingo Molnar <mingo@...nel.org> wrote:
> * Arnd Bergmann <arnd@...nel.org> wrote:
> > From: Arnd Bergmann <arnd@...db.de>

> This is indeed rather ugly - and the other patch that removes a debug
> check seems counterproductive as well.
>
> Do we know how many genuine bugs -Wstringop-overread-warning has
> caught or is about to catch?
>
> I.e. the real workaround might be to turn off the -Wstringop-overread-warning,
> until GCC-11 gets fixed?

See the [PATCH 0/11] message. The last two patches in the series are for
code that I suspect may be broken, the others are basically all false positives.

As gcc-11 is not released yet, I don't think we have to apply any of the
patches or disable the warning at the moment, but I posted all the patches
to get a better understanding on which of them should be addressed in
the kernel vs gcc.

       Arnd