On Wed, Nov 04, 2020 at 08:22:07PM +0100, Andrey Konovalov wrote:

On Wed, Nov 4, 2020 at 8:11 PM Vasily Gorbik [off-list ref] wrote:

quoted

On Mon, Nov 02, 2020 at 05:03:56PM +0100, Andrey Konovalov wrote:

quoted

This is a preparatory commit for the upcoming addition of a new hardware
tag-based (MTE-based) KASAN mode.

The new mode won't be using shadow memory, but will still use the concept
of memory granules. Each memory granule maps to a single metadata entry:
8 bytes per one shadow byte for generic mode, 16 bytes per one shadow byte
for software tag-based mode, and 16 bytes per one allocation tag for
hardware tag-based mode.

Rename KASAN_SHADOW_SCALE_SIZE to KASAN_GRANULE_SIZE, and KASAN_SHADOW_MASK
to KASAN_GRANULE_MASK.

Also use MASK when used as a mask, otherwise use SIZE.

No functional changes.

Signed-off-by: Andrey Konovalov <redacted>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Marco Elver <elver@google.com>
---
Change-Id: Iac733e2248aa9d29f6fc425d8946ba07cca73ecf
---
 Documentation/dev-tools/kasan.rst |  2 +-
 lib/test_kasan.c                  |  2 +-
 mm/kasan/common.c                 | 39 ++++++++++++++++---------------
 mm/kasan/generic.c                | 14 +++++------
 mm/kasan/generic_report.c         |  8 +++----
 mm/kasan/init.c                   |  8 +++----
 mm/kasan/kasan.h                  |  4 ++--
 mm/kasan/report.c                 | 10 ++++----
 mm/kasan/tags_report.c            |  2 +-
 9 files changed, 45 insertions(+), 44 deletions(-)

hm, this one got escaped somehow

lib/test_kasan_module.c:
18 #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE)

You mean it's not on the patch? It is, almost at the very top.

lib/test_kasan_module.c != lib/test_kasan.c

I fetched your branch. And I had to fix it up to build old good kasan
test module CONFIG_TEST_KASAN_MODULE=m

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