[PATCH] powerpc/kasan: fix boot failure with RELOCATABLE && FSL_BOOKE

[PATCH] powerpc/kasan: fix boot failure with RELOCATABLE && FSL_BOOKE

[Christophe Leroy]

When enabling CONFIG_RELOCATABLE and CONFIG_KASAN on FSL_BOOKE,
the kernel doesn't boot.

relocate_init() requires KASAN early shadow area to be set up because
it needs access to the device tree through generic functions.

Call kasan_early_init() before calling relocate_init()

Reported-by: Lexi Shao <shaolexi@huawei.com>
Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/kernel/head_fsl_booke.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 838d9d4650c7..6f7a3a7162c5 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -240,6 +240,9 @@ set_ivor:
 
 	bl	early_init
 
+#ifdef CONFIG_KASAN
+	bl	kasan_early_init
+#endif
 #ifdef CONFIG_RELOCATABLE
 	mr	r3,r30
 	mr	r4,r31
@@ -266,9 +269,6 @@ set_ivor:
 /*
  * Decide what sort of machine this is and initialize the MMU.
  */
-#ifdef CONFIG_KASAN
-	bl	kasan_early_init
-#endif
 	mr	r3,r30
 	mr	r4,r31
 	bl	machine_init
-- 
2.13.3

Re: [PATCH] powerpc/kasan: fix boot failure with RELOCATABLE && FSL_BOOKE

[Michael Ellerman]

On Fri, 2019-11-29 at 14:26:41 UTC, Christophe Leroy wrote:
> When enabling CONFIG_RELOCATABLE and CONFIG_KASAN on FSL_BOOKE,
> the kernel doesn't boot.
> 
> relocate_init() requires KASAN early shadow area to be set up because
> it needs access to the device tree through generic functions.
> 
> Call kasan_early_init() before calling relocate_init()
> 
> Reported-by: Lexi Shao <shaolexi@huawei.com>
> Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support")
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/71eb40fc53371bc247c8066ae76ad9e22ae1e18d

cheers