Commit c0935fca authored Mar 08, 2024 by Changbin Du Committed by Borislav Petkov (AMD) Mar 08, 2024

x86/sev: Disable KMSAN for memory encryption TUs



Instrumenting sev.c and mem_encrypt_identity.c with KMSAN will result in
a triple-faulting kernel. Some of the code is invoked too early during
boot, before KMSAN is ready.

Disable KMSAN instrumentation for the two translation units.

  [ bp: Massage commit message. ]

Signed-off-by: Changbin Du <changbin.du@huawei.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240308044401.1120395-1-changbin.du@huawei.com

parent d7b69b59

arch/x86/kernel/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@ KASAN_SANITIZE_sev.o := n
		KCSAN_SANITIZE := n
		KMSAN_SANITIZE_head$(BITS).o := n
		KMSAN_SANITIZE_nmi.o := n
		KMSAN_SANITIZE_sev.o := n

		# If instrumentation of the following files is enabled, boot hangs during
		# first second.

arch/x86/mm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@ KASAN_SANITIZE_pgprot.o := n
		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

		ifdef CONFIG_FUNCTION_TRACER
		CFLAGS_REMOVE_mem_encrypt.o = -pg