On Wed, Nov 11, 2020 at 4:22 PM Alexander Potapenko [off-list ref] wrote:

On Tue, Nov 10, 2020 at 11:12 PM Andrey Konovalov [off-list ref] wrote:

quoted

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

Rework print_memory_metadata() to make it agnostic with regard to the
way metadata is stored. Allow providing a separate metadata_fetch_row()
implementation for each KASAN mode. Hardware tag-based KASAN will provide
its own implementation that doesn't use shadow memory.

No functional changes for software modes.

Signed-off-by: Andrey Konovalov <redacted>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Marco Elver <elver@google.com>

Reviewed-by: Alexander Potapenko <glider@google.com>

quoted

+void metadata_fetch_row(char *buffer, void *row)
+{
+       memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW);

I think it is important to use __memcpy() instead of memcpy() in KASAN
runtime to avoid calling instrumented code.

Please disregard this. Turns out we define memcpy to __memcpy for
non-instrumented files.

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