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/mips/Kbuild | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 arch/mips/Kbuild (limited to 'arch/mips/Kbuild') diff --git a/arch/mips/Kbuild b/arch/mips/Kbuild new file mode 100644 index 000000000..e901bf554 --- /dev/null +++ b/arch/mips/Kbuild @@ -0,0 +1,25 @@ +# SPDX-License-Identifier: GPL-2.0 + +# platform specific definitions +include $(srctree)/arch/mips/Kbuild.platforms +obj-y := $(platform-y) + +# make clean traverses $(obj-) without having included .config, so +# everything ends up here +obj- := $(platform-y) + +# mips object files +# The object files are linked as core-y files would be linked + +obj-y += generic/ +obj-y += kernel/ +obj-y += mm/ +obj-y += net/ +obj-y += vdso/ + +ifdef CONFIG_KVM +obj-y += kvm/ +endif + +# for cleaning +subdir- += boot -- cgit v1.3.1