[PATCH 1/2] powerpc/kdump: fix KASAN sanitization flag for core_$(BITS).o

[Sourabh Jain]

KASAN instrumentation is intended to be disabled for the kexec core
code, but the existing Makefile entry misses the object suffix. As a
result, the flag is not applied correctly to core_$(BITS).o.

So when KASAN is enabled, kexec_copy_flush and copy_segments in
kexec/core_64.c are instrumented, which can result in accesses to
shadow memory via normal address translation paths. Since these run
with the MMU disabled, such accesses may trigger page faults
(bad_page_fault) that cannot be handled in the kdump path, ultimately
causing a hang and preventing the kdump kernel from booting. The same
is true for kexec as well, since the same functions are used there.

Update the entry to include the “.o” suffix so that KASAN
instrumentation is properly disabled for this object file.

Fixes: 2ab2d5794f14 ("powerpc/kasan: Disable address sanitization in kexec paths")
Reported-by: Venkat Rao Bagalkote <venkat88 at linux.ibm.com>
Closes: https://lore.kernel.org/all/1dee8891-8bcc-46b4-93f3-fc3a774abd5b@linux.ibm.com/
Cc: Aboorva Devarajan <aboorvad at linux.ibm.com>
Cc: Aditya Gupta <adityag at linux.ibm.com>
Cc: Daniel Axtens <dja at axtens.net>
Cc: Hari Bathini <hbathini at linux.ibm.com>
Cc: Madhavan Srinivasan <maddy at linux.ibm.com>
Cc: Mahesh Salgaonkar <mahesh at linux.ibm.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Ritesh Harjani (IBM) <ritesh.list at gmail.com>
Cc: Shivang Upadhyay <shivangu at linux.ibm.com>
Signed-off-by: Sourabh Jain <sourabhjain at linux.ibm.com>
---
 arch/powerpc/kexec/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
index 470eb0453e17..ec7a0eed75dc 100644
--- a/arch/powerpc/kexec/Makefile
+++ b/arch/powerpc/kexec/Makefile
@@ -16,4 +16,4 @@ GCOV_PROFILE_core_$(BITS).o := n
 KCOV_INSTRUMENT_core_$(BITS).o := n
 UBSAN_SANITIZE_core_$(BITS).o := n
 KASAN_SANITIZE_core.o := n
-KASAN_SANITIZE_core_$(BITS) := n
+KASAN_SANITIZE_core_$(BITS).o := n
-- 
2.52.0