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From:   Ilya Leoshkevich <iii@linux.ibm.com>
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        Alexander Potapenko <glider@google.com>,
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        Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH v3 05/34] kmsan: Fix is_bad_asm_addr() on arches with overlapping address spaces
Date:   Thu, 14 Dec 2023 00:24:25 +0100
Message-ID: <20231213233605.661251-6-iii@linux.ibm.com>
In-Reply-To: <20231213233605.661251-1-iii@linux.ibm.com>
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Comparing pointers with TASK_SIZE does not make sense when kernel and
userspace overlap. Skip the comparison when this is the case.

Reviewed-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 mm/kmsan/instrumentation.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c
index 470b0b4afcc4..8a1bbbc723ab 100644
--- a/mm/kmsan/instrumentation.c
+++ b/mm/kmsan/instrumentation.c
@@ -20,7 +20,8 @@
 
 static inline bool is_bad_asm_addr(void *addr, uintptr_t size, bool is_store)
 {
-	if ((u64)addr < TASK_SIZE)
+	if (IS_ENABLED(CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE) &&
+	    (u64)addr < TASK_SIZE)
 		return true;
 	if (!kmsan_get_metadata(addr, KMSAN_META_SHADOW))
 		return true;
-- 
2.43.0