On Tue, Nov 10, 2020 at 11:11 PM Andrey Konovalov <andreyknvl@xxxxxxxxxx> 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>
Reviewed-by: Alexander Potapenko <glider@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 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
Google Germany GmbH
Erika-Mann-Straße, 33
80636 München
Geschäftsführer: Paul Manicle, Halimah DeLaine Prado
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
