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From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	"Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-toolchains@vger.kernel.org,
	Masahiro Yamada <masahiroy@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: make ctype ascii only? (was [PATCH] kbuild: treat char as always signed)
Date: Wed, 26 Oct 2022 02:10:02 +0200	[thread overview]
Message-ID: <3a2fa7c1-2e31-0479-761f-9c189f8ed8c3@rasmusvillemoes.dk> (raw)
In-Reply-To: <CAHk-=whT+xyge9UjH+r6dt0FG-eUdrzu5hDMce_vC+n8uLam2A@mail.gmail.com>

On 19/10/2022 21.54, Linus Torvalds wrote:
> On Wed, Oct 19, 2022 at 9:27 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>>
>> So let's just eliminate this particular variety of heisensigned bugs
>> entirely. Set `-fsigned-char` globally, so that gcc makes the type
>> signed on all architectures.
> 
> Btw, I do wonder if we might actually be better off doing this - but
> doing it the other way around.

Only very tangentially related (because it has to do with chars...): Can
we switch our ctype to be ASCII only, just as it was back in the good'ol
mid 90s [i.e. before
https://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux-fullhistory.git/commit/lib/ctype.c?id=036b97b05489161be06e63be77c5fad9247d23ff].

It bugs me that it's almost-but-not-quite-latin1, that toupper() isn't
idempotent, and that one can hit an isalpha() with toupper() and get
something that isn't isalpha().

Rasmus

  parent reply	other threads:[~2022-10-26  0:10 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-19 16:26 [PATCH] kbuild: treat char as always signed Jason A. Donenfeld
2022-10-19 16:54 ` Segher Boessenkool
2022-10-19 17:14   ` Linus Torvalds
2022-10-19 17:26     ` Linus Torvalds
2022-10-19 18:10       ` Nick Desaulniers
2022-10-19 18:35         ` Linus Torvalds
2022-10-19 19:23           ` Andy Shevchenko
2022-10-19 19:36             ` Linus Torvalds
2022-10-19 17:43     ` Segher Boessenkool
2022-10-19 18:11       ` Linus Torvalds
2022-10-19 18:20         ` Nick Desaulniers
2022-10-19 18:56           ` Linus Torvalds
2022-10-19 19:11             ` Kees Cook
2022-10-19 19:30               ` Linus Torvalds
2022-10-19 20:35                 ` Jason A. Donenfeld
2022-10-20  0:10                   ` Linus Torvalds
2022-10-20  3:11                     ` Jason A. Donenfeld
2022-10-19 20:15             ` Segher Boessenkool
2022-10-19 21:07         ` David Laight
2022-10-19 21:26           ` Segher Boessenkool
2022-10-20 10:41         ` Gabriel Paubert
2022-10-21 22:46           ` Linus Torvalds
2022-10-22  6:06             ` Gabriel Paubert
2022-10-22 18:16               ` Linus Torvalds
2022-10-23 20:23                 ` Gabriel Paubert
2022-10-25 23:00                   ` Kees Cook
2022-10-26  0:04                     ` Jason A. Donenfeld
2022-10-26 15:41                       ` Kees Cook
2022-10-19 19:54 ` Linus Torvalds
2022-10-19 20:23   ` Jason A. Donenfeld
2022-10-19 20:30     ` [PATCH v2] kbuild: treat char as always unsigned Jason A. Donenfeld
2022-10-19 23:56       ` Linus Torvalds
2022-10-20  0:02         ` Jason A. Donenfeld
2022-10-20  0:38           ` Linus Torvalds
2022-10-20  2:59             ` Jason A. Donenfeld
2022-10-20 18:41             ` Kees Cook
2022-10-21  1:01               ` Jason A. Donenfeld
2022-10-20 20:24         ` Segher Boessenkool
2022-10-24  9:24       ` Dan Carpenter
2022-10-24  9:30         ` Dan Carpenter
2022-10-24 16:33           ` Jason A. Donenfeld
2022-10-24 17:10             ` Linus Torvalds
2022-10-24 17:17               ` Jason A. Donenfeld
2022-10-25 19:22                 ` Kalle Valo
2022-10-25 10:16               ` David Laight
2022-10-24 15:17         ` Jason A. Donenfeld
2022-12-21 14:53       ` Guenter Roeck
2022-12-21 15:05         ` Geert Uytterhoeven
2022-12-21 15:23           ` Guenter Roeck
2022-12-21 15:29           ` Rasmus Villemoes
2022-12-21 15:56             ` Guenter Roeck
2022-12-21 17:06               ` Linus Torvalds
2022-12-21 17:19                 ` Guenter Roeck
2022-12-21 18:46                   ` Linus Torvalds
2022-12-21 19:08                     ` Linus Torvalds
2022-12-21 21:01                     ` Guenter Roeck
2022-12-22 13:05                     ` Geert Uytterhoeven
2022-12-22 10:41                 ` David Laight
     [not found]                   ` <f02e0ac7f2d805020a7ba66803aaff3e31b5eeff.camel@t-online.de>
2022-12-24  9:47                     ` Geert Uytterhoeven
2022-12-30 11:39                     ` David Laight
2022-12-30 13:13                       ` David Laight
2023-01-02  8:29                       ` Geert Uytterhoeven
2022-12-21 17:49               ` Andreas Schwab
2022-12-21 16:57             ` Geert Uytterhoeven
2022-10-19 20:58   ` [PATCH] kbuild: treat char as always signed David Laight
2022-10-26  0:10   ` Rasmus Villemoes [this message]
2022-10-26 18:10     ` make ctype ascii only? (was [PATCH] kbuild: treat char as always signed) Linus Torvalds
2022-10-27  7:59       ` Rasmus Villemoes
2022-10-27 18:28         ` Linus Torvalds
2022-10-20  8:39 ` [PATCH] kbuild: treat char as always signed kernel test robot
2022-10-20 16:33   ` Jason A. Donenfeld
2022-10-20 16:33     ` Jason A. Donenfeld

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