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/clk/tegra/clk-dfll.h | 48 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 drivers/clk/tegra/clk-dfll.h (limited to 'drivers/clk/tegra/clk-dfll.h') diff --git a/drivers/clk/tegra/clk-dfll.h b/drivers/clk/tegra/clk-dfll.h new file mode 100644 index 000000000..fb209eb5f --- /dev/null +++ b/drivers/clk/tegra/clk-dfll.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * clk-dfll.h - prototypes and macros for the Tegra DFLL clocksource driver + * Copyright (C) 2013-2019 NVIDIA Corporation. All rights reserved. + * + * Aleksandr Frid + * Paul Walmsley + */ + +#ifndef __DRIVERS_CLK_TEGRA_CLK_DFLL_H +#define __DRIVERS_CLK_TEGRA_CLK_DFLL_H + +#include +#include +#include + +#include "cvb.h" + +/** + * struct tegra_dfll_soc_data - SoC-specific hooks/integration for the DFLL driver + * @dev: struct device * that holds the OPP table for the DFLL + * @max_freq: maximum frequency supported on this SoC + * @cvb: CPU frequency table for this SoC + * @alignment: parameters of the regulator step and offset + * @init_clock_trimmers: callback to initialize clock trimmers + * @set_clock_trimmers_high: callback to tune clock trimmers for high voltage + * @set_clock_trimmers_low: callback to tune clock trimmers for low voltage + */ +struct tegra_dfll_soc_data { + struct device *dev; + unsigned long max_freq; + const struct cvb_table *cvb; + struct rail_alignment alignment; + + void (*init_clock_trimmers)(void); + void (*set_clock_trimmers_high)(void); + void (*set_clock_trimmers_low)(void); +}; + +int tegra_dfll_register(struct platform_device *pdev, + struct tegra_dfll_soc_data *soc); +struct tegra_dfll_soc_data *tegra_dfll_unregister(struct platform_device *pdev); +int tegra_dfll_runtime_suspend(struct device *dev); +int tegra_dfll_runtime_resume(struct device *dev); +int tegra_dfll_suspend(struct device *dev); +int tegra_dfll_resume(struct device *dev); + +#endif /* __DRIVERS_CLK_TEGRA_CLK_DFLL_H */ -- cgit v1.3.1