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/ts2020.h | 74 ++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 drivers/media/dvb-frontends/ts2020.h (limited to 'drivers/media/dvb-frontends/ts2020.h') diff --git a/drivers/media/dvb-frontends/ts2020.h b/drivers/media/dvb-frontends/ts2020.h new file mode 100644 index 000000000..84c2dc8c3 --- /dev/null +++ b/drivers/media/dvb-frontends/ts2020.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + Montage Technology TS2020 - Silicon Tuner driver + Copyright (C) 2009-2012 Konstantin Dimitrov + + Copyright (C) 2009-2012 TurboSight.com + + */ + +#ifndef TS2020_H +#define TS2020_H + +#include + +struct ts2020_config { + u8 tuner_address; + u32 frequency_div; + + /* + * RF loop-through + */ + bool loop_through:1; + + /* + * clock output + */ +#define TS2020_CLK_OUT_DISABLED 0 +#define TS2020_CLK_OUT_ENABLED 1 +#define TS2020_CLK_OUT_ENABLED_XTALOUT 2 + u8 clk_out:2; + + /* + * clock output divider + * 1 - 31 + */ + u8 clk_out_div:5; + + /* Set to true to suppress stat polling */ + bool dont_poll:1; + + /* + * pointer to DVB frontend + */ + struct dvb_frontend *fe; + + /* + * driver private, do not set value + */ + u8 attach_in_use:1; + + /* Operation to be called by the ts2020 driver to get the value of the + * AGC PWM tuner input as theoretically output by the demodulator. + */ + int (*get_agc_pwm)(struct dvb_frontend *fe, u8 *_agc_pwm); +}; + +/* Do not add new ts2020_attach() users! Use I2C bindings instead. */ +#if IS_REACHABLE(CONFIG_DVB_TS2020) +extern struct dvb_frontend *ts2020_attach( + struct dvb_frontend *fe, + const struct ts2020_config *config, + struct i2c_adapter *i2c); +#else +static inline struct dvb_frontend *ts2020_attach( + struct dvb_frontend *fe, + const struct ts2020_config *config, + struct i2c_adapter *i2c) +{ + printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__); + return NULL; +} +#endif + +#endif /* TS2020_H */ -- cgit v1.3.1