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/drxd.h | 55 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 drivers/media/dvb-frontends/drxd.h (limited to 'drivers/media/dvb-frontends/drxd.h') diff --git a/drivers/media/dvb-frontends/drxd.h b/drivers/media/dvb-frontends/drxd.h new file mode 100644 index 000000000..ba54fd9ad --- /dev/null +++ b/drivers/media/dvb-frontends/drxd.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * drxd.h: DRXD DVB-T demodulator driver + * + * Copyright (C) 2005-2007 Micronas + */ + +#ifndef _DRXD_H_ +#define _DRXD_H_ + +#include +#include + +struct drxd_config { + u8 index; + + u8 pll_address; + u8 pll_type; +#define DRXD_PLL_NONE 0 +#define DRXD_PLL_DTT7520X 1 +#define DRXD_PLL_MT3X0823 2 + + u32 clock; + u8 insert_rs_byte; + + u8 demod_address; + u8 demoda_address; + u8 demod_revision; + + /* If the tuner is not behind an i2c gate, be sure to flip this bit + or else the i2c bus could get wedged */ + u8 disable_i2c_gate_ctrl; + + u32 IF; + s16(*osc_deviation) (void *priv, s16 dev, int flag); +}; + +#if IS_REACHABLE(CONFIG_DVB_DRXD) +extern +struct dvb_frontend *drxd_attach(const struct drxd_config *config, + void *priv, struct i2c_adapter *i2c, + struct device *dev); +#else +static inline +struct dvb_frontend *drxd_attach(const struct drxd_config *config, + void *priv, struct i2c_adapter *i2c, + struct device *dev) +{ + printk(KERN_INFO "%s: not probed - driver disabled by Kconfig\n", + __func__); + return NULL; +} +#endif + +#endif -- cgit v1.3.1