linux-kernel - Re: [PATCH] kasan: disable kasan_strings() kunit test when CONFIG_FORTIFY

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Message-ID: <aIs4rwZ1o53iTuP/@e129823.arm.com>
Date: Thu, 31 Jul 2025 10:34:39 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
	dvyukov@...gle.com, vincenzo.frascino@....com,
	akpm@...ux-foundation.org, kasan-dev@...glegroups.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kasan: disable kasan_strings() kunit test when
 CONFIG_FORTIFY_SOURCE enabled

Hi Thomas,

> > When CONFIG_FORTIFY_SOURCE is enabled, invalid access from source
> > triggers __fortify_panic() which kills running task.
> >
> > This makes failured of kasan_strings() kunit testcase since the
> > kunit-try-cacth kthread running kasan_string() dies before checking the
> > fault.
> >
> > To address this, skip kasan_strings() kunit test when
> > CONFIG_FORTIFY_SOURCE is enabled.
> >
> > Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> > ---
> >  mm/kasan/kasan_test_c.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/mm/kasan/kasan_test_c.c b/mm/kasan/kasan_test_c.c
> > index 5f922dd38ffa..1577d3edabb4 100644
> > --- a/mm/kasan/kasan_test_c.c
> > +++ b/mm/kasan/kasan_test_c.c
> > @@ -1576,6 +1576,12 @@ static void kasan_strings(struct kunit *test)
> >  	 */
> >  	KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
> >
> > +	/*
> > +	 * Harden common str/mem functions kills the kunit-try-catch thread
> > +	 * before checking the fault.
> > +	 */
> > +	KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_FORTIFY_SOURCE);
>
> Would it be enough to enable -D__NO_FORTIFY for the whole of kasan_test_c.c?

It would be better. I'll add it to Makefile unless other comment is.

Thanks!

[...]
--
Sincerely,
Yeoreum Yun