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/media/dvb-frontends/mxl692.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 drivers/media/dvb-frontends/mxl692.h (limited to 'drivers/media/dvb-frontends/mxl692.h') diff --git a/drivers/media/dvb-frontends/mxl692.h b/drivers/media/dvb-frontends/mxl692.h new file mode 100644 index 000000000..77764a047 --- /dev/null +++ b/drivers/media/dvb-frontends/mxl692.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Driver for the MaxLinear MxL69x family of tuners/demods + * + * Copyright (C) 2020 Brad Love + * + * based on code: + * Copyright (c) 2016 MaxLinear, Inc. All rights reserved + * which was released under GPL V2 + */ + +#ifndef _MXL692_H_ +#define _MXL692_H_ + +#include + +#define MXL692_FIRMWARE "dvb-demod-mxl692.fw" + +struct mxl692_config { + unsigned char id; + u8 i2c_addr; + /* + * frontend + * returned by driver + */ + struct dvb_frontend **fe; +}; + +#endif /* _MXL692_H_ */ -- cgit v1.3.1