From: Kalle Valo <kvalo@kernel.org>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
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>,
linux-wireless <linux-wireless@vger.kernel.org>,
Larry Finger <Larry.Finger@lwfinger.net>,
mikem@ring3k.org, wlanfae@realtek.com
Subject: Re: [PATCH v2] kbuild: treat char as always unsigned
Date: Tue, 25 Oct 2022 22:22:41 +0300 [thread overview]
Message-ID: <874jvrzp1a.fsf@kernel.org> (raw)
In-Reply-To: <CAHmME9ox7JNqOOZHEHCgaS95rsn-dVr4QOnN1mfmFEn=i9_jvw@mail.gmail.com> (Jason A. Donenfeld's message of "Mon, 24 Oct 2022 19:17:25 +0200")
"Jason A. Donenfeld" <Jason@zx2c4.com> writes:
> Hi Linus,
>
> On Mon, Oct 24, 2022 at 7:11 PM Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>> IOW, I don't think these are 6.1 material as some kind of obvious
>> fixes, at least not without driver author acks.
>
> Right, these are posted to the authors and maintainers to look at.
> Maybe they punt them until 6.2 which would be fine too.
>
>> On Mon, Oct 24, 2022 at 9:34 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>> Some of those may need more thought. For example, that first one:
>>
>> > https://lore.kernel.org/all/20221024163005.536097-1-Jason@zx2c4.com
>>
>> looks just *strange*. As far as I can tell, no other wireless drivers
>> do any sign checks at all.
>>
>> Now, I didn't really look around a lot, but looking at a few other
>> SIOCSIWESSID users, most don't even seem to treat it as a string at
>> all, but as just a byte dump (so memcpy() instead of strncpy())
Yes, SSID should be handled as a byte array with a specified length.
Back in the day some badly written code treated it as string but luckily
it's rare now.
>> As far as I know, there are no actual rules for SSID character sets,
>> and while using utf-8 or something else might cause interoperability
>> problems, this driver seems to be just confused. If you want to check
>> for "printable characters", that check is still wrong.
>>
>> So I don't think this is a "assume char is signed" issue. I think this
>> is a "driver is confused" issue.
>
> Yea I had a few versions of this. In one of them, I changed `char
> *extra` throughout the wireless stack into `s8 *extra` and in another
> `u8 *extra`, after realizing they're mostly just bags of bits. But
> that seemed pretty invasive when, indeed, this staging driver is just
> a little screwy.
>
> So perhaps the right fix is to just kill that whole snippet? Kalle - opinions?
I would also remove the whole 'extra[i] < 0', seems like a pointless
check to me. And I see that you already submitted v2, good.
--
https://patchwork.kernel.org/project/linux-wireless/list/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
next prev parent reply other threads:[~2022-10-25 19:22 UTC|newest]
Thread overview: 70+ 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 [this message]
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 ` make ctype ascii only? (was [PATCH] kbuild: treat char as always signed) Rasmus Villemoes
2022-10-26 18:10 ` Linus Torvalds
2022-10-27 7:59 ` Rasmus Villemoes
2022-10-27 18:28 ` Linus Torvalds
[not found] ` <202210201618.8XhEGsLd-lkp@intel.com>
2022-10-20 16:33 ` [PATCH] kbuild: treat char as always signed Jason A. Donenfeld
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