linux-kernel - Re: [PATCH 3/3] arm64: Kconfig: support CONFIG_KASAN

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Message-ID: <20210109072633.7234-1-lecopzer.chen@mediatek.com>
Date:   Sat, 9 Jan 2021 15:26:33 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <andreyknvl@...gle.com>
CC:     <akpm@...ux-foundation.org>, <aryabinin@...tuozzo.com>,
        <catalin.marinas@....com>, <dan.j.williams@...el.com>,
        <dvyukov@...gle.com>, <glider@...gle.com>,
        <kasan-dev@...glegroups.com>, <lecopzer.chen@...iatek.com>,
        <lecopzer@...il.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-mm@...ck.org>,
        <will@...nel.org>, <yj.chiang@...iatek.com>
Subject: Re: [PATCH 3/3] arm64: Kconfig: support CONFIG_KASAN_VMALLOC

Hi Andrey,
 
> On Sun, Jan 3, 2021 at 6:13 PM Lecopzer Chen <lecopzer@...il.com> wrote:
> >
> > Now I have no device to test for HW_TAG, so keep it not selected
> > until someone can test this.
> >
> > Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
> > ---
> >  arch/arm64/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index 05e17351e4f3..29ab35aab59e 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -136,6 +136,7 @@ config ARM64
> >         select HAVE_ARCH_JUMP_LABEL
> >         select HAVE_ARCH_JUMP_LABEL_RELATIVE
> >         select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
> > +       select HAVE_ARCH_KASAN_VMALLOC if (HAVE_ARCH_KASAN && !KASAN_HW_TAGS)
> 
> KASAN_VMALLOC currently "depends on" KASAN_GENERIC. I think we should
> either do "HAVE_ARCH_KASAN && KASAN_GENERIC" here as well, or just do
> "if HAVE_ARCH_KASAN".

Thanks for the correctness, I'll change to the following in V2 patch.
	"select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN"

Let KASAN_VMALLOC depend on the mode it supports to avoid modifying
two places if KASAN_VMALLOC can support other than GENERIC in the future.