linux-kernel - Re: [RFC PATCH v1] powerpc: Enable KFENCE for PPC32

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Date:   Tue, 2 Mar 2021 09:58:19 +0100
From:   Marco Elver <elver@...gle.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [RFC PATCH v1] powerpc: Enable KFENCE for PPC32

On Tue, 2 Mar 2021 at 09:37, Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
> Add architecture specific implementation details for KFENCE and enable
> KFENCE for the ppc32 architecture. In particular, this implements the
> required interface in <asm/kfence.h>.

Nice!

> KFENCE requires that attributes for pages from its memory pool can
> individually be set. Therefore, force the Read/Write linear map to be
> mapped at page granularity.
>
> Unit tests succeed on all tests but one:
>
>         [   15.053324]     # test_invalid_access: EXPECTATION FAILED at mm/kfence/kfence_test.c:636
>         [   15.053324]     Expected report_matches(&expect) to be true, but is false
>         [   15.068359]     not ok 21 - test_invalid_access

This is strange, given all the other tests passed. Do you mind sharing
the full test log?

Thanks,
-- Marco