* [PATCH] powerpc/kasan: Disable KCOV in KASAN code
@ 2023-07-10 4:41 Benjamin Gray
2023-07-20 13:50 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Benjamin Gray @ 2023-07-10 4:41 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Benjamin Gray
As per the generic KASAN code in mm/kasan, disable KCOV with
KCOV_INSTRUMENT := n in the makefile.
This fixes a ppc64 boot hang when KCOV and KASAN are enabled.
kasan_early_init() gets called before a PACA is initialised, but the
KCOV hook expects a valid PACA.
Suggested-by: Christophe Leroy <christophe.leroy@csgroup•eu>
Signed-off-by: Benjamin Gray <bgray@linux•ibm.com>
---
The generic makefile has other disabled sanitisers / hooks, but this
patch is just an upstream of fixing a blocking issue for running
syzkaller. The blocker is resolved by this; kernels stop hanging on boot
with KCOV + KASAN.
This works as an alternative to
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20230707013110.215693-1-bgray@linux.ibm.com/
---
arch/powerpc/mm/kasan/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/mm/kasan/Makefile b/arch/powerpc/mm/kasan/Makefile
index 699eeffd9f55..f9522fd70b2f 100644
--- a/arch/powerpc/mm/kasan/Makefile
+++ b/arch/powerpc/mm/kasan/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
KASAN_SANITIZE := n
+KCOV_INSTRUMENT := n
obj-$(CONFIG_PPC32) += init_32.o
obj-$(CONFIG_PPC_8xx) += 8xx.o
--
2.41.0
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2023-07-20 13:50 ` Michael Ellerman
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