linux-kernel - Re: [PATCH RFC v2 21/21] kasan: clarify comment in __kasan_kfree

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Message-ID: <CACT4Y+YHvfccvAYgkO5TrB=uy_htvNi4qshfLOqvci3RGzfR1Q@mail.gmail.com>
Date:   Wed, 28 Oct 2020 18:04:16 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Serban Constantinescu <serbanc@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        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 RFC v2 21/21] kasan: clarify comment in __kasan_kfree_large

On Thu, Oct 22, 2020 at 3:20 PM Andrey Konovalov <andreyknvl@...gle.com> 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>
> Link: https://linux-review.googlesource.com/id/I1334dffb69b87d7986fab88a1a039cc3ea764725

Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>

> ---
>  mm/kasan/common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index 3cd56861eb11..54af79aa8d3f 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -445,5 +445,5 @@ 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(). */
>  }
> --
> 2.29.0.rc1.297.gfa9743e501-goog
>