linux-kernel - Re: [PATCH 01/12] x86/mce: use correct format characters

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Date:   Thu, 9 Jun 2022 16:18:31 -0700
From:   Bill Wendling <morbo@...gle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Bill Wendling <isanbard@...il.com>,
        Tony Luck <tony.luck@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Ross Philipson <ross.philipson@...cle.com>,
        linux-edac@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-mm@...ck.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, Networking <netdev@...r.kernel.org>,
        alsa-devel@...a-project.org,
        clang-built-linux <llvm@...ts.linux.dev>
Subject: Re: [PATCH 01/12] x86/mce: use correct format characters

On Thu, Jun 9, 2022 at 4:15 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> On 6/9/22 15:16, Bill Wendling wrote:
> > From: Bill Wendling <isanbard@...il.com>
> >
> > When compiling with -Wformat, clang emits the following warnings:
> >
> > arch/x86/kernel/cpu/mce/core.c:295:9: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
> >                 panic(msg);
> >                       ^~~
> >
> > Use a string literal for the format string.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/378
> > Signed-off-by: Bill Wendling <isanbard@...il.com>
> > ---
> >  arch/x86/kernel/cpu/mce/core.c | 2 +-
> >  scripts/Makefile.extrawarn     | 4 ++--
>
> Where is the scripts/ change?
>
I'm sorry about this. The change in that file was a mistake that I
reverted, but I forgot to change this part.

-bw

> >  2 files changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
> > index 2c8ec5c71712..3d411b7c85ad 100644
> > --- a/arch/x86/kernel/cpu/mce/core.c
> > +++ b/arch/x86/kernel/cpu/mce/core.c
> > @@ -292,7 +292,7 @@ static noinstr void mce_panic(const char *msg, struct mce *final, char *exp)
> >       if (!fake_panic) {
> >               if (panic_timeout == 0)
> >                       panic_timeout = mca_cfg.panic_timeout;
> > -             panic(msg);
> > +             panic("%s", msg);
> >       } else
> >               pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg);
> >
>
> --
> ~Randy