linux-kernel - [PATCH] powerpc/kasan: KASAN is not supported on RELOCATABLE && FSL

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Date:   Fri, 29 Nov 2019 15:04:55 +0800
From:   Lexi Shao <shaolexi@...wei.com>
To:     <benh@...nel.crashing.org>, <paulus@...ba.org>,
        <mpe@...erman.id.au>, <christophe.leroy@....fr>
CC:     <liucheng32@...wei.com>, <yi.zhang@...wei.com>,
        <wangkefeng.wang@...wei.com>, <shaolexi@...wei.com>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: [PATCH] powerpc/kasan: KASAN is not supported on RELOCATABLE && FSL_BOOKE

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@...wei.com>
---
 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