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/ralink/common.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 arch/mips/ralink/common.h (limited to 'arch/mips/ralink/common.h') diff --git a/arch/mips/ralink/common.h b/arch/mips/ralink/common.h new file mode 100644 index 000000000..893981a0c --- /dev/null +++ b/arch/mips/ralink/common.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * + * Copyright (C) 2013 John Crispin + */ + +#ifndef _RALINK_COMMON_H__ +#define _RALINK_COMMON_H__ + +#define RAMIPS_SYS_TYPE_LEN 32 + +struct ralink_soc_info { + unsigned char sys_type[RAMIPS_SYS_TYPE_LEN]; + unsigned char *compatible; + + unsigned long mem_base; + unsigned long mem_size; + unsigned long mem_size_min; + unsigned long mem_size_max; + void (*mem_detect)(void); +}; +extern struct ralink_soc_info soc_info; + +extern void ralink_of_remap(void); + +extern void __init prom_soc_init(struct ralink_soc_info *soc_info); + +#endif /* _RALINK_COMMON_H__ */ -- cgit v1.3.1