[PATCH] powerpc/kasan: KASAN is not supported on RELOCATABLE && FSL_BOOKE

From: Lexi Shao
Date: Fri Nov 29 2019 - 02:05:19 EST


CONFIG_RELOCATABLE and CONFIG_KASAN cannot be enabled at the same time
on ppce500 fsl_booke. All functions called before kasan_early_init()
should be disabled with kasan check. When CONFIG_RELOCATABLE is enabled
on ppce500 fsl_booke, relocate_init() is called before kasan_early_init()
which triggers kasan check and results in boot failure.
Call trace and functions which triggers kasan check(*):
- _start
- set_ivor
- relocate_init(*)
- early_get_first_memblock_info(*)
- of_scan_flat_dt(*)
...
- kasan_early_init

Potential solutions could be 1. implement relocate_init and all its children
function in a seperate file or 2. introduce a global vairable in KASAN, only
enable KASAN check when init is done.

Disable KASAN when RELOCATABLE is selected on fsl_booke for now until
it is supported.

Signed-off-by: Lexi Shao <shaolexi@xxxxxxxxxx>
---
arch/powerpc/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3e56c9c2f16e..14f3da63c088 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -171,7 +171,7 @@ config PPC
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
select HAVE_ARCH_JUMP_LABEL
- select HAVE_ARCH_KASAN if PPC32
+ select HAVE_ARCH_KASAN if PPC32 && !(RELOCATABLE && FSL_BOOKE)
select HAVE_ARCH_KGDB
select HAVE_ARCH_MMAP_RND_BITS
select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
--
2.12.3