linux-kernel - Re: [PATCH v14 2/4] kasan: allow architectures to provide an outline readiness check

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Date:   Thu, 17 Jun 2021 08:55:40 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Daniel Axtens <dja@...ens.net>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kasan-dev@...glegroups.com, elver@...gle.com,
        akpm@...ux-foundation.org, andreyknvl@...il.com
Cc:     linuxppc-dev@...ts.ozlabs.org, aneesh.kumar@...ux.ibm.com,
        bsingharora@...il.com,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v14 2/4] kasan: allow architectures to provide an outline
 readiness check



Le 17/06/2021 à 08:39, Daniel Axtens a écrit :
> Allow architectures to define a kasan_arch_is_ready() hook that bails
> out of any function that's about to touch the shadow unless the arch
> says that it is ready for the memory to be accessed. This is fairly
> uninvasive and should have a negligible performance penalty.
> 
> This will only work in outline mode, so an arch must specify
> ARCH_DISABLE_KASAN_INLINE if it requires this.
> 
> Cc: Balbir Singh <bsingharora@...il.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> Suggested-by: Christophe Leroy <christophe.leroy@...roup.eu>
> Signed-off-by: Daniel Axtens <dja@...ens.net>
> 
> --
> 
> Both previous RFCs for ppc64 - by 2 different people - have
> needed this trick! See:
>   - https://lore.kernel.org/patchwork/patch/592820/ # ppc64 hash series
>   - https://patchwork.ozlabs.org/patch/795211/      # ppc radix series
> 
> I haven't been able to exercise the arch hook error for !GENERIC as I
> don't have a particularly modern aarch64 toolchain or a lot of experience
> cross-compiling with clang. But it does fire for GENERIC + INLINE on x86.

Modern toolchains are available here https://mirrors.edge.kernel.org/pub/tools/crosstool/