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Message-ID: <CACT4Y+Y+5g24oAMDL7SKESXO6p6tW=OrC9Y8S1=Lhs6DwAkuUA@mail.gmail.com>
Date: Mon, 16 Nov 2020 12:01:59 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Marco Elver <elver@...gle.com>,
Evgenii Stepanov <eugenis@...gle.com>,
Branislav Rankov <Branislav.Rankov@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
kasan-dev <kasan-dev@...glegroups.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH mm v3 05/19] kasan: allow VMAP_STACK for HW_TAGS mode
On Fri, Nov 13, 2020 at 11:20 PM 'Andrey Konovalov' via kasan-dev
<kasan-dev@...glegroups.com> wrote:
>
> Even though hardware tag-based mode currently doesn't support checking
> vmalloc allocations, it doesn't use shadow memory and works with
> VMAP_STACK as is. Change VMAP_STACK definition accordingly.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Reviewed-by: Marco Elver <elver@...gle.com>
Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Link: https://linux-review.googlesource.com/id/I3552cbc12321dec82cd7372676e9372a2eb452ac
> ---
> arch/Kconfig | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 9ebdab3d0ca2..546869c3269d 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -921,16 +921,16 @@ config VMAP_STACK
> default y
> bool "Use a virtually-mapped stack"
> depends on HAVE_ARCH_VMAP_STACK
> - depends on !KASAN || KASAN_VMALLOC
> + depends on !KASAN || KASAN_HW_TAGS || KASAN_VMALLOC
> help
> Enable this if you want the use virtually-mapped kernel stacks
> with guard pages. This causes kernel stack overflows to be
> caught immediately rather than causing difficult-to-diagnose
> corruption.
>
> - To use this with KASAN, the architecture must support backing
> - virtual mappings with real shadow memory, and KASAN_VMALLOC must
> - be enabled.
> + To use this with software KASAN modes, the architecture must support
> + backing virtual mappings with real shadow memory, and KASAN_VMALLOC
> + must be enabled.
>
> config ARCH_OPTIONAL_KERNEL_RWX
> def_bool n
> --
> 2.29.2.299.gdc1121823c-goog
>
> --
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