linux-kernel - Re: [PATCH] gpiolib: acpi: use correct format characters

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAGG=3QVCkF7RdbQ85MtKgUjm8qP79BESAUiGU3wSQc0+ExO0gA@mail.gmail.com>
Date:   Fri, 18 Mar 2022 11:25:25 -0700
From:   Bill Wendling <morbo@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Nathan Chancellor <nathan@...nel.org>,
        linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, llvm@...ts.linux.dev,
        Joe Perches <joe@...ches.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] gpiolib: acpi: use correct format characters

On Fri, Mar 18, 2022 at 11:01 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> On Fri, Mar 18, 2022 at 7:04 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > On Thu, Mar 17, 2022 at 11:11:21AM -0700, Nick Desaulniers wrote:
> > > Our goal is to enable -Wformat for CC=clang.  Please see also:
> > > commit cbacb5ab0aa0 ("docs: printk-formats: Stop encouraging use of
> > > unnecessary %h[xudi] and %hh[xudi]")
> >
> > Not that I agree on that commit for %h[h]x
> >
> >         signed char ch = -1;
> >         printf("%x\n", ch);
> >         printf("%hhx\n", ch);
>
> Will print:
> ffffffff
> ff
>
I noticed this. My first thought was to do something akin to:

  printf("%x\n", (u8)ch);

but went the route of removing the "h" qualifiers to be more in line
with previous fixes. I will be happy to change this patch if that's
what you would prefer.

-bw