linux-kernel - Re: [PATCH v2 17/20] kasan: clarify comment in __kasan_kfree

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Date:   Wed, 11 Nov 2020 20:18:41 +0100
From:   Marco Elver <elver@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 17/20] kasan: clarify comment in __kasan_kfree_large

On Tue, Nov 10, 2020 at 11:20PM +0100, Andrey Konovalov wrote:
> Currently it says that the memory gets poisoned by page_alloc code.
> Clarify this by mentioning the specific callback that poisons the
> memory.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
> Link: https://linux-review.googlesource.com/id/I1334dffb69b87d7986fab88a1a039cc3ea764725
> ---
>  mm/kasan/common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

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

> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index 40ff3ce07a76..4360292ad7f3 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -436,5 +436,5 @@ void __kasan_kfree_large(void *ptr, unsigned long ip)
>  {
>  	if (ptr != page_address(virt_to_head_page(ptr)))
>  		kasan_report_invalid_free(ptr, ip);
> -	/* The object will be poisoned by page_alloc. */
> +	/* The object will be poisoned by kasan_free_pages(). */
>  }
> -- 
> 2.29.2.222.g5d2a92d10f8-goog
>