Commit 818c4fda authored by Naohiro Aota's avatar Naohiro Aota Committed by Andrew Morton

x86/mm: disable instrumentations of mm/pgprot.c

Commit 4867fbbd ("x86/mm: move protection_map[] inside the platform")
moved accesses to protection_map[] from mem_encrypt_amd.c to pgprot.c.  As
a result, the accesses are now targets of KASAN (and other
instrumentations), leading to the crash during the boot process.

Disable the instrumentations for pgprot.c like commit 67bb8e99
("x86/mm: Disable various instrumentations of mm/mem_encrypt.c and
mm/tlb.c").

Before this patch, my AMD machine cannot boot since v6.0-rc1 with KASAN
enabled, without anything printed.  After the change, it successfully
boots up.

Fixes: 4867fbbd ("x86/mm: move protection_map[] inside the platform")
Link: https://lkml.kernel.org/r/20220824084726.2174758-1-naohiro.aota@wdc.comSigned-off-by: default avatarNaohiro Aota <naohiro.aota@wdc.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ac87ca0e
......@@ -4,10 +4,12 @@ KCOV_INSTRUMENT_tlb.o := n
KCOV_INSTRUMENT_mem_encrypt.o := n
KCOV_INSTRUMENT_mem_encrypt_amd.o := n
KCOV_INSTRUMENT_mem_encrypt_identity.o := n
KCOV_INSTRUMENT_pgprot.o := n
KASAN_SANITIZE_mem_encrypt.o := n
KASAN_SANITIZE_mem_encrypt_amd.o := n
KASAN_SANITIZE_mem_encrypt_identity.o := n
KASAN_SANITIZE_pgprot.o := n
# Disable KCSAN entirely, because otherwise we get warnings that some functions
# reference __initdata sections.
......@@ -17,6 +19,7 @@ ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_mem_encrypt.o = -pg
CFLAGS_REMOVE_mem_encrypt_amd.o = -pg
CFLAGS_REMOVE_mem_encrypt_identity.o = -pg
CFLAGS_REMOVE_pgprot.o = -pg
endif
obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o mmap.o \
......
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