linux-hardening - Re: [PATCH v2 2/3] fortify: Add KUnit test for FORTIFY

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Message-ID: <202209022215.FA016FA6@keescook>
Date:   Fri, 2 Sep 2022 22:17:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Gow <davidgow@...gle.com>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Yury Norov <yury.norov@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Sander Vanheule <sander@...nheule.net>,
        linux-hardening@...r.kernel.org, llvm@...ts.linux.dev,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Isabella Basso <isabbasso@...eup.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Eric Biggers <ebiggers@...gle.com>,
        Hannes Reinecke <hare@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] fortify: Add KUnit test for FORTIFY_SOURCE
 internals

On Sat, Sep 03, 2022 at 10:59:24AM +0800, David Gow wrote:
> On Sat, Sep 3, 2022 at 4:43 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > Add lib/fortify_kunit.c KUnit test for checking the expected behavioral
> > characteristics of FORTIFY_SOURCE internals.
> > [...]
> 
> Overall, this looks good. It's a bit of a shame FORTIFY_SOURCE doesn't
> work under UML, but I tested it on everything else I had to hand and
> it looked good.

It looks like this was never picked up:
https://lore.kernel.org/lkml/20220210003224.773957-1-keescook@chromium.org/

I suppose I could take it via the kernel hardening tree?

> One tiny typo in a comment below, but otherwise this is:
> 
> Reviewed-by: David Gow <davidgow@...gle.com>
> 
> [...]
> > +/*
> > + * Runtime test cases for CONFIG_FORTIFY_SOURCE that aren't expected to
> > + * Oops th kernel on success. (For those, see drivers/misc/lkdtm/fortify.c)
> 
> Nit: Oops _the_ kernel

Thanks! I'll get that updated. :)

-- 
Kees Cook