From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- arch/arm64/kvm/Makefile | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 arch/arm64/kvm/Makefile (limited to 'arch/arm64/kvm/Makefile') diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile new file mode 100644 index 000000000..59612d2f2 --- /dev/null +++ b/arch/arm64/kvm/Makefile @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for Kernel-based Virtual Machine module +# + +ccflags-y += -I $(src) + +include $(srctree)/virt/kvm/Makefile.kvm + +obj-$(CONFIG_KVM) += kvm.o +obj-$(CONFIG_KVM) += hyp/ + +CFLAGS_sys_regs.o += -Wno-override-init +CFLAGS_handle_exit.o += -Wno-override-init + +kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \ + inject_fault.o va_layout.o handle_exit.o config.o \ + guest.o debug.o reset.o sys_regs.o stacktrace.o \ + vgic-sys-reg-v3.o fpsimd.o pkvm.o \ + arch_timer.o trng.o vmid.o emulate-nested.o nested.o at.o \ + vgic/vgic.o vgic/vgic-init.o \ + vgic/vgic-irqfd.o vgic/vgic-v2.o \ + vgic/vgic-v3.o vgic/vgic-v4.o \ + vgic/vgic-mmio.o vgic/vgic-mmio-v2.o \ + vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \ + vgic/vgic-its.o vgic/vgic-debug.o vgic/vgic-v3-nested.o \ + vgic/vgic-v5.o + +kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o pmu.o +kvm-$(CONFIG_ARM64_PTR_AUTH) += pauth.o +kvm-$(CONFIG_PTDUMP_STAGE2_DEBUGFS) += ptdump.o + +kvm-$(CONFIG_NVHE_EL2_TRACING) += hyp_trace.o + +always-y := hyp_constants.h hyp-constants.s + +define rule_gen_hyp_constants + $(call filechk,offsets,__HYP_CONSTANTS_H__) +endef + +CFLAGS_hyp-constants.o = -I $(src)/hyp/include +$(obj)/hyp-constants.s: $(src)/hyp/hyp-constants.c FORCE + $(call if_changed_dep,cc_s_c) + +$(obj)/hyp_constants.h: $(obj)/hyp-constants.s FORCE + $(call if_changed_rule,gen_hyp_constants) + +obj-kvm := $(addprefix $(obj)/, $(kvm-y)) +$(obj-kvm): $(obj)/hyp_constants.h -- cgit v1.3.1