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 --- net/nfc/Kconfig | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 net/nfc/Kconfig (limited to 'net/nfc/Kconfig') diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig new file mode 100644 index 000000000..466a0279b --- /dev/null +++ b/net/nfc/Kconfig @@ -0,0 +1,34 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# NFC subsystem configuration +# + +menuconfig NFC + depends on RFKILL || !RFKILL + tristate "NFC subsystem support" + default n + help + Say Y here if you want to build support for NFC (Near field + communication) devices. + + To compile this support as a module, choose M here: the module will + be called nfc. + +config NFC_DIGITAL + depends on NFC + select CRC_CCITT + select CRC_ITU_T + tristate "NFC Digital Protocol stack support" + default n + help + Say Y if you want to build NFC digital protocol stack support. + This is needed by NFC chipsets whose firmware only implement + the NFC analog layer. + + To compile this support as a module, choose M here: the module will + be called nfc_digital. + +source "net/nfc/nci/Kconfig" +source "net/nfc/hci/Kconfig" + +source "drivers/nfc/Kconfig" -- cgit v1.3.1