linux-kernel - Re: [PATCH] kasan: Fix Oops due to missing calls to kasan_arch_is

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Message-ID: <874jsctwcm.fsf@mpe.ellerman.id.au>
Date:   Fri, 27 Jan 2023 15:50:01 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     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>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, kasan-dev@...glegroups.com,
        Nathan Lynch <nathanl@...ux.ibm.com>
Subject: Re: [PATCH] kasan: Fix Oops due to missing calls to
 kasan_arch_is_ready()

Andrew Morton <akpm@...ux-foundation.org> writes:
> On Thu, 26 Jan 2023 08:04:47 +0100 Christophe Leroy <christophe.leroy@...roup.eu> wrote:
>
>> On powerpc64, you can build a kernel with KASAN as soon as you build it
>> with RADIX MMU support. However if the CPU doesn't have RADIX MMU,
>> KASAN isn't enabled at init and the following Oops is encountered.
>
> Should we backport to -stable?  If so, can we identify a suitable Fixes: target?

It would be nice if it went to stable, but I'd defer to the Kasan maintainers.

The kasan_arch_is_ready() checks went in a while back, but there wasn't
a meaningful user until the powerpc support went in, so I'd target that:

Fixes: 41b7a347bf14 ("powerpc: Book3S 64-bit outline-only KASAN support")
Cc: stable@...r.kernel.org # v5.19+

cheers