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/rtl2830.h | 38 +++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 drivers/media/dvb-frontends/rtl2830.h (limited to 'drivers/media/dvb-frontends/rtl2830.h') diff --git a/drivers/media/dvb-frontends/rtl2830.h b/drivers/media/dvb-frontends/rtl2830.h new file mode 100644 index 000000000..fb5522025 --- /dev/null +++ b/drivers/media/dvb-frontends/rtl2830.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Realtek RTL2830 DVB-T demodulator driver + * + * Copyright (C) 2011 Antti Palosaari + */ + +#ifndef RTL2830_H +#define RTL2830_H + +#include + +/** + * struct rtl2830_platform_data - Platform data for the rtl2830 driver + * @clk: Clock frequency (4000000, 16000000, 25000000, 28800000). + * @spec_inv: Spectrum inversion. + * @vtop: AGC take-over point. + * @krf: AGC ratio. + * @agc_targ_val: AGC. + * @get_dvb_frontend: Get DVB frontend. + * @get_i2c_adapter: Get I2C adapter. + * @pid_filter: Set PID to PID filter. + * @pid_filter_ctrl: Control PID filter. + */ +struct rtl2830_platform_data { + u32 clk; + bool spec_inv; + u8 vtop; + u8 krf; + u8 agc_targ_val; + + struct dvb_frontend* (*get_dvb_frontend)(struct i2c_client *); + struct i2c_adapter* (*get_i2c_adapter)(struct i2c_client *); + int (*pid_filter)(struct dvb_frontend *, u8, u16, int); + int (*pid_filter_ctrl)(struct dvb_frontend *, int); +}; + +#endif /* RTL2830_H */ -- cgit v1.3.1