linux-kernel - Re: [linus:master] [crypto] 40b9969796: UBSAN:unsigned-integer-overflow_in

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Message-Id: <324a5724-7bde-42f2-8910-e70b5b5f9d9e@app.fastmail.com>
Date: Wed, 28 May 2025 18:58:44 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Kees Cook" <kees@...nel.org>, "Eric Biggers" <ebiggers@...nel.org>,
 "Justin Stitt" <justinstitt@...gle.com>
Cc: linux-hardening@...r.kernel.org, oe-lkp@...ts.linux.dev,
 "kernel test robot" <lkp@...el.com>, linux-kernel@...r.kernel.org,
 "Herbert Xu" <herbert@...dor.apana.org.au>,
 linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
 linux-s390@...r.kernel.org, linux-crypto@...r.kernel.org,
 "kernel test robot" <oliver.sang@...el.com>, llvm@...ts.linux.dev
Subject: Re: [linus:master] [crypto]  40b9969796:
 UBSAN:unsigned-integer-overflow_in_lib/crypto/chacha20poly1305-selftest.c

On Wed, May 28, 2025, at 18:45, Kees Cook wrote:
> On Tue, May 27, 2025 at 11:14:27PM -0700, Eric Biggers wrote:
>> On Wed, May 28, 2025 at 01:15:05PM +0800, kernel test robot wrote:

> I'm not sure how to enforce "don't enable this unless you're developing
> the Overflow Behavior Types" with current Kconfig, given the randconfig
> gap... I have some memory of Arnd doing something special with his
> randconfigs to avoid these kinds of things, but I can't find it now.
>

The main thing I do on the randconfig builds to avoid obscure issues
is to force CONFIG_COMPILE_TEST=y, but that only works for build
testing, not actually running it.

      Arnd