linux-hardening - Re: [PATCH v2] ubsan: Tighten UBSAN

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Date:   Wed, 21 Jun 2023 17:50:53 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     Marco Elver <elver@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>, linux-kbuild@...r.kernel.org,
        llvm@...ts.linux.dev, Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] ubsan: Tighten UBSAN_BOUNDS on GCC

On 6/21/23 10:52, Kees Cook wrote:
> On Wed, Jun 21, 2023 at 09:42:01AM -0700, Guenter Roeck wrote:
>> Hi,
>>
>> On Tue, Apr 04, 2023 at 07:23:59PM -0700, Kees Cook wrote:
>>> The use of -fsanitize=bounds on GCC will ignore some trailing arrays,
>>> leaving a gap in coverage. Switch to using -fsanitize=bounds-strict to
>>> match Clang's stricter behavior.
>>>
>>> Cc: Marco Elver <elver@...gle.com>
>>> Cc: Masahiro Yamada <masahiroy@...nel.org>
>>> Cc: Nathan Chancellor <nathan@...nel.org>
>>> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
>>> Cc: Nicolas Schier <nicolas@...sle.eu>
>>> Cc: Tom Rix <trix@...hat.com>
>>> Cc: Josh Poimboeuf <jpoimboe@...nel.org>
>>> Cc: Miroslav Benes <mbenes@...e.cz>
>>> Cc: linux-kbuild@...r.kernel.org
>>> Cc: llvm@...ts.linux.dev
>>> Signed-off-by: Kees Cook <keescook@...omium.org>
>>> ---
>>
>> This patch, presumably as side effect, enables CONFIG_ARCH_STM32
>> for arm64:allmodconfig. As consequence, CONFIG_STM32_RPROC is enabled
>> as well. This in turn results in the following build error.
>>
>> Building arm64:allmodconfig ... failed
>> --------------
>> Error log:
>> In file included from include/linux/printk.h:564,
>>                   from include/asm-generic/bug.h:22,
>>                   from arch/arm64/include/asm/bug.h:26,
>>                   from include/linux/bug.h:5,
>>                   from include/linux/fortify-string.h:5,
>>                   from include/linux/string.h:254,
>>                   from include/linux/dma-mapping.h:7,
>>                   from drivers/remoteproc/stm32_rproc.c:9:
>> drivers/remoteproc/stm32_rproc.c: In function 'stm32_rproc_mem_alloc':
>> drivers/remoteproc/stm32_rproc.c:122:22: error: format '%x' expects argument of type 'unsigned int', but argument 5 has type 'size_t'
>>
>> I did not try to understand what is going on, but reverting this
>> patch fixes the problem.
> 
> Well that is really weird! I will investigate... this patch should be
> pretty self-contained...
> 
Meh, it is. Sorry for the noise. My bisect script was wrong.

Guenter