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x86/sev: Disable KMSAN for memory encryption TUs

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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
This commit is contained in:
Changbin Du 2024-03-08 12:44:01 +08:00 committed by Borislav Petkov (AMD)
parent d7b69b590b
commit c0935fca6b
2 changed files with 2 additions and 0 deletions
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1
arch/x86/kernel/Makefile
View File

@ -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.

1
arch/x86/mm/Makefile
View File

@ -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