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/isl6423.h | 51 +++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 drivers/media/dvb-frontends/isl6423.h (limited to 'drivers/media/dvb-frontends/isl6423.h') diff --git a/drivers/media/dvb-frontends/isl6423.h b/drivers/media/dvb-frontends/isl6423.h new file mode 100644 index 000000000..9fa87ceff --- /dev/null +++ b/drivers/media/dvb-frontends/isl6423.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + Intersil ISL6423 SEC and LNB Power supply controller + + Copyright (C) Manu Abraham + +*/ + +#ifndef __ISL_6423_H +#define __ISL_6423_H + +#include + +enum isl6423_current { + SEC_CURRENT_275m = 0, + SEC_CURRENT_515m, + SEC_CURRENT_635m, + SEC_CURRENT_800m, +}; + +enum isl6423_curlim { + SEC_CURRENT_LIM_ON = 1, + SEC_CURRENT_LIM_OFF +}; + +struct isl6423_config { + enum isl6423_current current_max; + enum isl6423_curlim curlim; + u8 addr; + u8 mod_extern; +}; + +#if IS_REACHABLE(CONFIG_DVB_ISL6423) + + +extern struct dvb_frontend *isl6423_attach(struct dvb_frontend *fe, + struct i2c_adapter *i2c, + const struct isl6423_config *config); + +#else +static inline struct dvb_frontend *isl6423_attach(struct dvb_frontend *fe, + struct i2c_adapter *i2c, + const struct isl6423_config *config) +{ + printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__); + return NULL; +} + +#endif /* CONFIG_DVB_ISL6423 */ + +#endif /* __ISL_6423_H */ -- cgit v1.3.1