[PATCH 6.1 062/197] powerpc/kasan: Limit KASAN thread size increase to 32KB

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>

[ Upstream commit f1acb109505d983779bbb7e20a1ee6244d2b5736 ]

KASAN is seen to increase stack usage, to the point that it was reported
to lead to stack overflow on some 32-bit machines (see link).

To avoid overflows the stack size was doubled for KASAN builds in
commit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase with
KASAN").

However with a 32KB stack size to begin with, the doubling leads to a
64KB stack, which causes build errors:
  arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff)

Although the asm could be reworked, in practice a 32KB stack seems
sufficient even for KASAN builds - the additional usage seems to be in
the 2-3KB range for a 64-bit KASAN build.

So only increase the stack for KASAN if the stack size is < 32KB.

Fixes: 18f14afe2816 ("powerpc/64s: Increase default stack size to 32KB")
Reported-by: Spoorthy <spoorthy@xxxxxxxxxxxxx>
Reported-by: Benjamin Gray <bgray@xxxxxxxxxxxxx>
Reviewed-by: Benjamin Gray <bgray@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/linuxppc-dev/bug-207129-206035@xxxxxxxxxxxxxxxxxxxxxxxxx%2F/
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20240212064244.3924505-1-mpe@xxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/powerpc/include/asm/thread_info.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index af58f1ed3952..c4b798aa6ce8 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -14,7 +14,7 @@
 
 #ifdef __KERNEL__
 
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN) && CONFIG_THREAD_SHIFT < 15
 #define MIN_THREAD_SHIFT	(CONFIG_THREAD_SHIFT + 1)
 #else
 #define MIN_THREAD_SHIFT	CONFIG_THREAD_SHIFT
-- 
2.43.0







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