linux-kernel - Re: [PATCH v9 19/44] kasan: rename addr_has_shadow to addr_has

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Date:   Wed, 11 Nov 2020 16:06:16 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...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 Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 19/44] kasan: rename addr_has_shadow to addr_has_metadata

On Tue, Nov 10, 2020 at 11:11 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> This is a preparatory commit for the upcoming addition of a new hardware
> tag-based (MTE-based) KASAN mode.
>
> Hardware tag-based KASAN won't be using shadow memory, but will reuse
> this function. Rename "shadow" to implementation-neutral "metadata".
>
> No functional changes.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Reviewed-by: Marco Elver <elver@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>
> ---
> Change-Id: I03706fe34b38da7860c39aa0968e00001a7d1873
> ---
>  mm/kasan/kasan.h          | 2 +-
>  mm/kasan/report.c         | 6 +++---
>  mm/kasan/report_generic.c | 2 +-
>  3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index d0cf61d4d70d..f9366dfd94c9 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -146,7 +146,7 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
>                 << KASAN_SHADOW_SCALE_SHIFT);
>  }
>
> -static inline bool addr_has_shadow(const void *addr)
> +static inline bool addr_has_metadata(const void *addr)
>  {
>         return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
>  }
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index af9138ea54ad..2990ca34abaf 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -361,7 +361,7 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
>         untagged_addr = reset_tag(tagged_addr);
>
>         info.access_addr = tagged_addr;
> -       if (addr_has_shadow(untagged_addr))
> +       if (addr_has_metadata(untagged_addr))
>                 info.first_bad_addr = find_first_bad_addr(tagged_addr, size);
>         else
>                 info.first_bad_addr = untagged_addr;
> @@ -372,11 +372,11 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
>         start_report(&flags);
>
>         print_error_description(&info);
> -       if (addr_has_shadow(untagged_addr))
> +       if (addr_has_metadata(untagged_addr))
>                 print_tags(get_tag(tagged_addr), info.first_bad_addr);
>         pr_err("\n");
>
> -       if (addr_has_shadow(untagged_addr)) {
> +       if (addr_has_metadata(untagged_addr)) {
>                 print_address_description(untagged_addr, get_tag(tagged_addr));
>                 pr_err("\n");
>                 print_shadow_for_address(info.first_bad_addr);
> diff --git a/mm/kasan/report_generic.c b/mm/kasan/report_generic.c
> index b543a1ed6078..16ed550850e9 100644
> --- a/mm/kasan/report_generic.c
> +++ b/mm/kasan/report_generic.c
> @@ -118,7 +118,7 @@ const char *get_bug_type(struct kasan_access_info *info)
>         if (info->access_addr + info->access_size < info->access_addr)
>                 return "out-of-bounds";
>
> -       if (addr_has_shadow(info->access_addr))
> +       if (addr_has_metadata(info->access_addr))
>                 return get_shadow_bug_type(info);
>         return get_wild_bug_type(info);
>  }
> --
> 2.29.2.222.g5d2a92d10f8-goog
>


-- 
Alexander Potapenko
Software Engineer

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