linux-kernel - Re: [PATCH 28/35] kasan: define KASAN_GRANULE_SIZE for HW

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200827104147.GG29264@gaia>
Date:   Thu, 27 Aug 2020 11:41:47 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 28/35] kasan: define KASAN_GRANULE_SIZE for HW_TAGS

On Fri, Aug 14, 2020 at 07:27:10PM +0200, Andrey Konovalov wrote:
> Hardware tag-based KASAN has granules of MTE_GRANULE_SIZE. Define
> KASAN_GRANULE_SIZE to MTE_GRANULE_SIZE for CONFIG_KASAN_HW_TAGS.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> ---
>  mm/kasan/kasan.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index 1d3c7c6ce771..4d8e229f8e01 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -5,7 +5,13 @@
>  #include <linux/kasan.h>
>  #include <linux/stackdepot.h>
>  
> +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
>  #define KASAN_GRANULE_SIZE	(1UL << KASAN_SHADOW_SCALE_SHIFT)
> +#else
> +#include <asm/mte.h>

You could only include the new asm/mte-def.h file (currently mte_asm.h).

> +#define KASAN_GRANULE_SIZE	(MTE_GRANULE_SIZE)
> +#endif
> +
>  #define KASAN_GRANULE_MASK	(KASAN_GRANULE_SIZE - 1)
>  
>  #define KASAN_TAG_KERNEL	0xFF /* native kernel pointers tag */
> -- 
> 2.28.0.220.ged08abb693-goog
> 

-- 
Catalin