linux-kernel - [PATCH] powerpc/kasan: Fix stack overflow by increasing THREAD

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Date:   Wed,  8 Apr 2020 15:58:49 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, <erhard_f@...lbox.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
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: <erhard_f@...lbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 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