ARM: disable broken eBPF JIT on the Risc PC

[PATCH] ARM: disable broken eBPF JIT on the Risc PC

Ethan Nelson-Moore posted 1 patch 1 week ago

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arch/arm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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[PATCH] ARM: disable broken eBPF JIT on the Risc PC

Posted by Ethan Nelson-Moore 1 week ago

The eBPF JIT unconditionally generates ldrh/strh instructions, which do
not function correctly on the Risc PC because its bus is unable to
signal half-word accesses. Work around this issue by disabling the eBPF
JIT when building for ARMv3 (the Risc PC is the only currently
supported ARMv3 machine).

Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Cc: stable@vger.kernel.org
Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
---
 arch/arm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1155c78bb6aa..8185d013e5d1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -98,7 +98,7 @@ config ARM
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARM_LPAE
 	select HAVE_ARM_SMCCC if CPU_V7
-	select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32
+	select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32 && !CPU_32v3
 	select HAVE_CONTEXT_TRACKING_USER
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_BUILDTIME_MCOUNT_SORT
-- 
2.43.0