From: Alexander Potapenko <glider@google.com>
To: glider@google.com
Cc: elver@google.com, dvyukov@google.com,
dave.hansen@linux.intel.com, peterz@infradead.org,
akpm@linux-foundation.org, x86@kernel.org,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH 1/3] x86: mm: disable KMSAN instrumentation for physaddr.c
Date: Fri, 21 Jun 2024 11:48:59 +0200 [thread overview]
Message-ID: <20240621094901.1360454-1-glider@google.com> (raw)
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@linux.intel.com>
Closes: https://github.com/google/kmsan/issues/95
Signed-off-by: Alexander Potapenko <glider@google.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
next reply other threads:[~2024-06-21 9:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-21 9:48 Alexander Potapenko [this message]
2024-06-21 9:49 ` [PATCH 2/3] lib/Kconfig.debug: disable LOCK_DEBUGGING_SUPPORT under KMSAN Alexander Potapenko
2024-06-21 15:02 ` Kirill A . Shutemov
2024-06-21 16:16 ` Dave Hansen
2024-06-21 16:23 ` Dave Hansen
2024-06-25 18:51 ` Boqun Feng
2024-06-25 19:06 ` Paul E. McKenney
2024-06-25 19:37 ` Boqun Feng
2024-06-26 8:35 ` Alexander Potapenko
2024-06-21 9:49 ` [PATCH 3/3] x86/traps: fix an objtool warning in handle_bug() Alexander Potapenko
2024-06-21 15:09 ` Kirill A . Shutemov
2024-06-21 14:57 ` [PATCH 1/3] x86: mm: disable KMSAN instrumentation for physaddr.c Kirill A . Shutemov
2024-06-21 16:40 ` Dave Hansen
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