linux-kernel - [PATCH 1/3] x86: mm: disable KMSAN instrumentation for physaddr.c

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Date: Fri, 21 Jun 2024 11:48:59 +0200
From: Alexander Potapenko <glider@...gle.com>
To: glider@...gle.com
Cc: elver@...gle.com, dvyukov@...gle.com, dave.hansen@...ux.intel.com, 
	peterz@...radead.org, akpm@...ux-foundation.org, x86@...nel.org, 
	linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com, 
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 1/3] x86: mm: disable KMSAN instrumentation for physaddr.c

Enabling CONFIG_DEBUG_VIRTUAL=y together with KMSAN led to infinite
recursion, because kmsan_get_metadata() ended up calling instrumented
__pfn_valid() from arch/x86/mm/physaddr.c.

Prevent it by disabling instrumentation of the whole file.

Reported-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Closes: https://github.com/google/kmsan/issues/95
Signed-off-by: Alexander Potapenko <glider@...gle.com>
---
 arch/x86/mm/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 8d3a00e5c528e..d3b27a383127d 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -17,6 +17,7 @@ KCSAN_SANITIZE := n
 # Avoid recursion by not calling KMSAN hooks for CEA code.
 KMSAN_SANITIZE_cpu_entry_area.o := n
 KMSAN_SANITIZE_mem_encrypt_identity.o := n
+KMSAN_SANITIZE_physaddr.o := n
 
 ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_mem_encrypt.o		= -pg
-- 
2.45.2.741.gdbec12cfda-goog