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Date:   Thu, 1 Oct 2020 19:45:09 +0200
From:   elver@google.com
To:     Andrey Konovalov <andreyknvl@google.com>
Cc:     Dmitry Vyukov <dvyukov@google.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        kasan-dev@googlegroups.com,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        Elena Petrova <lenaptr@google.com>,
        Branislav Rankov <Branislav.Rankov@arm.com>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 16/39] kasan: rename addr_has_shadow to
 addr_has_metadata
Message-ID: <20201001174509.GL4162920@elver.google.com>
References: <cover.1600987622.git.andreyknvl@google.com>
 <fd0103571c825317241bfdc43ef19766fd370e4f.1600987622.git.andreyknvl@google.com>
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On Fri, Sep 25, 2020 at 12:50AM +0200, 'Andrey Konovalov' via kasan-dev 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@google.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>

Reviewed-by: Marco Elver <elver@google.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 8dfacc0f73ea..0bf669fad345 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 91b869673148..145b966f8f4d 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -329,7 +329,7 @@ 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;
> @@ -340,11 +340,11 @@ 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 42b2b5791733..ff067071cd28 100644
> --- a/mm/kasan/report_generic.c
> +++ b/mm/kasan/report_generic.c
> @@ -117,7 +117,7 @@ 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);
>  }
> -- 
> 2.28.0.681.g6f77f65b4e-goog
> 
> -- 
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