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[v6,27/40] kasan: kasan_non_canonical_hook only for software modes

Message ID 36ab70fef7688f7a43871b82320784a67f8ffb10.1603999489.git.andreyknvl@google.com (mailing list archive)
State New, archived
Headers show
Series kasan: add hardware tag-based mode for arm64 | expand

Commit Message

Andrey Konovalov Oct. 29, 2020, 7:25 p.m. UTC 
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@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Marco Elver <elver@google.com>
---
Change-Id: Icc9f5ef100a2e86f3a4214a0c3131a68266181b2
---
 mm/kasan/report.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 5d5733831ad7..594bad2a3a5e 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -403,7 +403,8 @@  bool kasan_report(unsigned long addr, size_t size, bool is_write,
 	return ret;
 }
 
-#ifdef CONFIG_KASAN_INLINE
+#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
+	defined(CONFIG_KASAN_INLINE)
 /*
  * With CONFIG_KASAN_INLINE, accesses to bogus pointers (outside the high
  * canonical half of the address space) cause out-of-bounds shadow memory reads