[PATCH v3 18/39] kasan: kasan_non_canonical_hook only for software modes

Andrey Konovalov andreyknvl at google.com
Thu Sep 24 18:50:25 EDT 2020

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

kasan_non_canonical_hook() is only applicable to KASAN modes that use
shadow memory, and won't be needed for hardware tag-based KASAN.

No functional changes for software modes.

Signed-off-by: Andrey Konovalov <andreyknvl at google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino at arm.com>
Change-Id: Icc9f5ef100a2e86f3a4214a0c3131a68266181b2
 mm/kasan/report.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 9e4d539d62f4..67aa30b45805 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -371,7 +371,8 @@ bool kasan_report(unsigned long addr, size_t size, bool is_write,
 	return ret;
+#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
  * With CONFIG_KASAN_INLINE, accesses to bogus pointers (outside the high
  * canonical half of the address space) cause out-of-bounds shadow memory reads

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