linux-hardening - Re: [PATCH 6/9] fortify: Split reporting and avoid passing string pointer

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Message-Id: <19930c5a-f1ed-4b04-b69a-d7259966f020@app.fastmail.com>
Date: Thu, 22 Feb 2024 14:00:26 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "kernel test robot" <lkp@...el.com>, "Kees Cook" <keescook@...omium.org>,
 linux-hardening@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
 "Andy Shevchenko" <andy@...nel.org>,
 "Cezary Rojewski" <cezary.rojewski@...el.com>,
 "Puyou Lu" <puyou.lu@...il.com>, "Mark Brown" <broonie@...nel.org>,
 "Josh Poimboeuf" <jpoimboe@...nel.org>,
 "Peter Zijlstra" <peterz@...radead.org>,
 "Brendan Higgins" <brendan.higgins@...ux.dev>,
 "David Gow" <davidgow@...gle.com>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "Linux Memory Management List" <linux-mm@...ck.org>,
 "Nathan Chancellor" <nathan@...nel.org>,
 "Alexander Potapenko" <glider@...gle.com>,
 "Zhaoyang Huang" <zhaoyang.huang@...soc.com>,
 "Randy Dunlap" <rdunlap@...radead.org>,
 "Geert Uytterhoeven" <geert+renesas@...der.be>,
 "Miguel Ojeda" <ojeda@...nel.org>,
 "Nick Desaulniers" <ndesaulniers@...gle.com>,
 "Liam R. Howlett" <liam.howlett@...cle.com>,
 "Vlastimil Babka" <vbabka@...e.cz>,
 "Dan Williams" <dan.j.williams@...el.com>,
 "Rasmus Villemoes" <linux@...musvillemoes.dk>,
 "Yury Norov" <yury.norov@...il.com>,
 "Jason A . Donenfeld" <Jason@...c4.com>,
 "Sander Vanheule" <sander@...nheule.net>,
 "Eric Biggers" <ebiggers@...gle.com>,
 "Masami Hiramatsu" <mhiramat@...nel.org>,
 "Andrey Konovalov" <andreyknvl@...il.com>,
 "Linus Walleij" <linus.walleij@...aro.org>
Subject: Re: [PATCH 6/9] fortify: Split reporting and avoid passing string pointer

On Thu, Apr 6, 2023, at 13:19, kernel test robot wrote:

> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Link: 
> https://lore.kernel.org/oe-kbuild-all/202304061930.4Au0PASm-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>>> ld.lld: error: undefined symbol: __fortify_panic
>    >>> referenced by fortify-string.h:208 (include/linux/fortify-string.h:208)
>    >>>               arch/arm/boot/compressed/fdt_ro.o:(fdt_stringlist_count)
>    >>> referenced by fortify-string.h:208 (include/linux/fortify-string.h:208)
>    >>>               arch/arm/boot/compressed/fdt_ro.o:(fdt_stringlist_search)
>    >>> referenced by fortify-string.h:208 (include/linux/fortify-string.h:208)
>    >>>               arch/arm/boot/compressed/fdt_ro.o:(fdt_stringlist_get)

I get a related build failure from the same commit:

arch/arm/boot/compressed/misc.c:157:6: error: no previous prototype for '__fortify_panic' [-Werror=missing-prototypes]
  157 | void __fortify_panic(const u8 reason, size_t avail, size_t size)

      Arnd