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 --- drivers/net/netdevsim/Makefile | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 drivers/net/netdevsim/Makefile (limited to 'drivers/net/netdevsim/Makefile') diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile new file mode 100644 index 000000000..87718204f --- /dev/null +++ b/drivers/net/netdevsim/Makefile @@ -0,0 +1,27 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_NETDEVSIM) += netdevsim.o + +netdevsim-objs := \ + netdev.o dev.o ethtool.o fib.o bus.o health.o hwstats.o udp_tunnels.o tc.o + +ifeq ($(CONFIG_BPF_SYSCALL),y) +netdevsim-objs += \ + bpf.o +endif + +ifneq ($(CONFIG_XFRM_OFFLOAD),) +netdevsim-objs += ipsec.o +endif + +ifneq ($(CONFIG_PSAMPLE),) +netdevsim-objs += psample.o +endif + +ifneq ($(CONFIG_INET_PSP),) +netdevsim-objs += psp.o +endif + +ifneq ($(CONFIG_MACSEC),) +netdevsim-objs += macsec.o +endif -- cgit v1.3.1