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/a8293.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 drivers/media/dvb-frontends/a8293.h (limited to 'drivers/media/dvb-frontends/a8293.h') diff --git a/drivers/media/dvb-frontends/a8293.h b/drivers/media/dvb-frontends/a8293.h new file mode 100644 index 000000000..7fbac9735 --- /dev/null +++ b/drivers/media/dvb-frontends/a8293.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Allegro A8293 SEC driver + * + * Copyright (C) 2011 Antti Palosaari + */ + +#ifndef A8293_H +#define A8293_H + +#include + +/* + * I2C address + * 0x08, 0x09, 0x0a, 0x0b + */ + +/** + * struct a8293_platform_data - Platform data for the a8293 driver + * @dvb_frontend: DVB frontend. + * @volt_slew_nanos_per_mv: Slew rate when increasing LNB voltage, + * in nanoseconds per millivolt. + */ +struct a8293_platform_data { + struct dvb_frontend *dvb_frontend; + int volt_slew_nanos_per_mv; +}; + +#endif /* A8293_H */ -- cgit v1.3.1