linux-kernel - Re: [PATCH v3 11/39] kasan: don't duplicate config dependencies

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Date:   Thu, 1 Oct 2020 19:39:45 +0200
From:   elver@...gle.com
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev@...glegroups.com,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...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 v3 11/39] kasan: don't duplicate config dependencies

On Fri, Sep 25, 2020 at 12:50AM +0200, Andrey Konovalov wrote:
> Both KASAN_GENERIC and KASAN_SW_TAGS have common dependencies, move
> those to KASAN.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>

Reviewed-by: Marco Elver <elver@...gle.com>

But see comment below:

> ---
> Change-Id: I77e475802e8f1750b9154fe4a6e6da4456054fcd
> ---
>  lib/Kconfig.kasan | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index e1d55331b618..b4cf6c519d71 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -24,6 +24,9 @@ menuconfig KASAN
>  		   (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)
>  	depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
>  	depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS
> +	select SLUB_DEBUG if SLUB
> +	select CONSTRUCTORS
> +	select STACKDEPOT

In the later patch your move 'select SLUB_DEBUG' back to where they were
here it seems. The end result is the same, so I leave it to you if you
want to change it.

>  	help
>  	  Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
>  	  designed to find out-of-bounds accesses and use-after-free bugs.
> @@ -46,10 +49,6 @@ choice
>  config KASAN_GENERIC
>  	bool "Generic mode"
>  	depends on HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC
> -	depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
> -	select SLUB_DEBUG if SLUB
> -	select CONSTRUCTORS
> -	select STACKDEPOT
>  	help
>  	  Enables generic KASAN mode.
>  
> @@ -70,10 +69,6 @@ config KASAN_GENERIC
>  config KASAN_SW_TAGS
>  	bool "Software tag-based mode"
>  	depends on HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS
> -	depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
> -	select SLUB_DEBUG if SLUB
> -	select CONSTRUCTORS
> -	select STACKDEPOT
>  	help
>  	  Enables software tag-based KASAN mode.
>  
> -- 
> 2.28.0.681.g6f77f65b4e-goog
>