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/powerpc/boot/44x.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 arch/powerpc/boot/44x.h (limited to 'arch/powerpc/boot/44x.h') diff --git a/arch/powerpc/boot/44x.h b/arch/powerpc/boot/44x.h new file mode 100644 index 000000000..9b15e5952 --- /dev/null +++ b/arch/powerpc/boot/44x.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * PowerPC 44x related functions + * + * Copyright 2007 David Gibson, IBM Corporation. + */ +#ifndef _PPC_BOOT_44X_H_ +#define _PPC_BOOT_44X_H_ + +void ebony_init(void *mac0, void *mac1); +void bamboo_init(void *mac0, void *mac1); + +#endif /* _PPC_BOOT_44X_H_ */ -- cgit v1.3.1