2020-04-08 18:56:41

by Christophe Leroy

Subject: [PATCH] powerpc/kasan: Fix stack overflow by increasing THREAD_SHIFT

When CONFIG_KASAN is selected, the stack usage is increased.

In the same way as x86 and arm64 architectures, increase
THREAD_SHIFT when CONFIG_KASAN is selected.

Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=207129
Reported-by: <[email protected]>
Signed-off-by: Christophe Leroy <[email protected]>
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 05d20a8d6581..4444511f9bbc 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -771,6 +771,7 @@ config THREAD_SHIFT
range 13 15
default "15" if PPC_256K_PAGES
default "14" if PPC64
+ default "14" if KASAN
default "13"
help
Used to define the stack size. The default is almost always what you
--
2.25.0

2020-05-20 11:03:40

by Michael Ellerman

Subject: Re: [PATCH] powerpc/kasan: Fix stack overflow by increasing THREAD_SHIFT

On Wed, 8 Apr 2020 15:58:49 +0000 (UTC), Christophe Leroy wrote:
> When CONFIG_KASAN is selected, the stack usage is increased.
>
> In the same way as x86 and arm64 architectures, increase
> THREAD_SHIFT when CONFIG_KASAN is selected.

Applied to powerpc/next.

[1/1] powerpc/kasan: Fix stack overflow by increasing THREAD_SHIFT
https://git.kernel.org/powerpc/c/edbadaf0671072298e506074128b64e003c5812c

cheers