linux-kernel - Re: [PATCH] [RFC] ubsan: disallow bounds checking with gcov on broken gcc

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Message-Id: <bfcb63da-eaec-44f6-bcf3-7a15ed745b6b@app.fastmail.com>
Date:   Thu, 01 Jun 2023 21:03:24 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Kees Cook" <keescook@...omium.org>
Cc:     "Arnd Bergmann" <arnd@...nel.org>, kasan-dev@...glegroups.com,
        "Andrey Ryabinin" <ryabinin.a.a@...il.com>,
        "Alexander Potapenko" <glider@...gle.com>,
        "Andrey Konovalov" <andreyknvl@...il.com>,
        "Dmitry Vyukov" <dvyukov@...gle.com>,
        "Vincenzo Frascino" <vincenzo.frascino@....com>,
        "Marco Elver" <elver@...gle.com>, linux-media@...r.kernel.org,
        linux-crypto@...r.kernel.org,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Ard Biesheuvel" <ardb@...nel.org>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        "Dan Carpenter" <dan.carpenter@...aro.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        "AngeloGioacchino Del Regno" 
        <angelogioacchino.delregno@...labora.com>,
        "Nathan Chancellor" <nathan@...nel.org>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>,
        "Tom Rix" <trix@...hat.com>,
        "Josh Poimboeuf" <jpoimboe@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] [RFC] ubsan: disallow bounds checking with gcov on broken gcc

On Thu, Jun 1, 2023, at 20:28, Kees Cook wrote:
> On Thu, Jun 01, 2023 at 07:50:38PM +0200, Arnd Bergmann wrote:
>> On Thu, Jun 1, 2023, at 18:14, Kees Cook wrote:
>> >
>> > i.e. fall back through these:
>> > 	-fsanitize=array-bounds (Clang)
>> > 	-fsanitize=bounds-strict (!GCOV || bug fixed in GCC)
>> > 	-fsanitize=bounds
>> 
>> From what I can tell, -fsanitize=bounds has the same problem
>> as -fsanitize=bounds-strict, so that would not help.
>
> Ah, did something change with GCOV? This (bounds vs bounds-strict) is
> the only recent change to CONFIG_UBSAN_BOUNDS...

I missed this problem in my usual randconfig builds because I was
building with GCOV disabled due to disk size limitations until
Dan Carpenter pointed out the specific issue.

I suspect it's been there for a longer time.

      Arnd