linux/mm/kasan
Andrey Konovalov e86f8b09f2 kasan, mm: allow cache merging with no metadata
The reason cache merging is disabled with KASAN is because KASAN puts its
metadata right after the allocated object. When the merged caches have
slightly different sizes, the metadata ends up in different places, which
KASAN doesn't support.

It might be possible to adjust the metadata allocation algorithm and make
it friendly to the cache merging code. Instead this change takes a simpler
approach and allows merging caches when no metadata is present. Which is
the case for hardware tag-based KASAN with kasan.mode=prod.

Link: https://lkml.kernel.org/r/37497e940bfd4b32c0a93a702a9ae4cf061d5392.1606162397.git.andreyknvl@google.com
Link: https://linux-review.googlesource.com/id/Ia114847dfb2244f297d2cb82d592bf6a07455dba
Co-developed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-22 12:55:09 -08:00
..
common.c kasan, mm: allow cache merging with no metadata 2020-12-22 12:55:09 -08:00
generic.c kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00
hw_tags.c kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00
init.c kasan: define KASAN_MEMORY_PER_SHADOW_PAGE 2020-12-22 12:55:06 -08:00
kasan.h kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00
Makefile kasan, arm64: implement HW_TAGS runtime 2020-12-22 12:55:08 -08:00
quarantine.c kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00
report_generic.c kasan: separate metadata_fetch_row for each mode 2020-12-22 12:55:07 -08:00
report_hw_tags.c kasan: inline kasan_reset_tag for tag-based modes 2020-12-22 12:55:08 -08:00
report_sw_tags.c kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00
report.c kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00
shadow.c kasan: don't round_up too much 2020-12-22 12:55:09 -08:00
sw_tags.c kasan: sanitize objects when metadata doesn't fit 2020-12-22 12:55:09 -08:00