linux-kernel - Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e

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Message-ID: <20200915212804.vvm7ovffqynkvi5a@treble>
Date:   Tue, 15 Sep 2020 16:28:04 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Borislav Petkov <bp@...en8.de>, Marco Elver <elver@...gle.com>,
        Rong Chen <rong.a.chen@...el.com>,
        kernel test robot <lkp@...el.com>,
        "Li, Philip" <philip.li@...el.com>, x86-ml <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING
 e6eb15c9ba3165698488ae5c34920eea20eaa38e

On Tue, Sep 15, 2020 at 02:13:01PM -0700, Nick Desaulniers wrote:
> Triple checking what I wrote above; it looks like the randconfig had
> BOTH CONFIG_KASAN=y and CONFIG_UBSAN=y enabled.  Aren't the sanitizers
> supposed to be mutually exclusive?  If so, we should ensure that via
> kconfig these can't be selected together via randconfig.

No idea...

> Another peculiarity I noticed was that it seems that enabling
> CONFIG_UBSAN_TRAP=y doesn't allow me to select
> CONFIG_UBSAN_ALIGNMENT=y.  Is that intentional? (Looks like it
> lib/Kconfig.ubsan:74).

That was done intentionally by Kees, it was putting traps in a lot of
weird places.

-- 
Josh