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/usb/dwc2/debug.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 drivers/usb/dwc2/debug.h (limited to 'drivers/usb/dwc2/debug.h') diff --git a/drivers/usb/dwc2/debug.h b/drivers/usb/dwc2/debug.h new file mode 100644 index 000000000..47252c56d --- /dev/null +++ b/drivers/usb/dwc2/debug.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * debug.h - Designware USB2 DRD controller debug header + * + * Copyright (C) 2015 Intel Corporation + * Mian Yousaf Kaukab + */ + +#include "core.h" + +#ifdef CONFIG_DEBUG_FS +int dwc2_debugfs_init(struct dwc2_hsotg *hsotg); +void dwc2_debugfs_exit(struct dwc2_hsotg *hsotg); +#else +static inline int dwc2_debugfs_init(struct dwc2_hsotg *hsotg) +{ return 0; } +static inline void dwc2_debugfs_exit(struct dwc2_hsotg *hsotg) +{ } +#endif -- cgit v1.3.1