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/mxl5xx.h | 54 ++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 drivers/media/dvb-frontends/mxl5xx.h (limited to 'drivers/media/dvb-frontends/mxl5xx.h') diff --git a/drivers/media/dvb-frontends/mxl5xx.h b/drivers/media/dvb-frontends/mxl5xx.h new file mode 100644 index 000000000..139e16b2e --- /dev/null +++ b/drivers/media/dvb-frontends/mxl5xx.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Driver for the MaxLinear MxL5xx family of tuners/demods + * + * Copyright (C) 2014-2015 Ralph Metzler + * Marcus Metzler + * developed for Digital Devices GmbH + * + * based on code: + * Copyright (c) 2011-2013 MaxLinear, Inc. All rights reserved + * which was released under GPL V2 + */ + +#ifndef _MXL5XX_H_ +#define _MXL5XX_H_ + +#include +#include + +#include + +struct mxl5xx_cfg { + u8 adr; + u8 type; + u32 cap; + u32 clk; + u32 ts_clk; + + u8 *fw; + u32 fw_len; + + int (*fw_read)(void *priv, u8 *buf, u32 len); + void *fw_priv; +}; + +#if IS_REACHABLE(CONFIG_DVB_MXL5XX) + +extern struct dvb_frontend *mxl5xx_attach(struct i2c_adapter *i2c, + struct mxl5xx_cfg *cfg, u32 demod, u32 tuner, + int (**fn_set_input)(struct dvb_frontend *, int)); + +#else + +static inline struct dvb_frontend *mxl5xx_attach(struct i2c_adapter *i2c, + struct mxl5xx_cfg *cfg, u32 demod, u32 tuner, + int (**fn_set_input)(struct dvb_frontend *, int)) +{ + pr_warn("%s: driver disabled by Kconfig\n", __func__); + return NULL; +} + +#endif /* CONFIG_DVB_MXL5XX */ + +#endif /* _MXL5XX_H_ */ -- cgit v1.3.1