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@xxxxxxxxxx>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
> ---
> 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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