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/sprd/composite.c | 59 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 drivers/clk/sprd/composite.c (limited to 'drivers/clk/sprd/composite.c') diff --git a/drivers/clk/sprd/composite.c b/drivers/clk/sprd/composite.c new file mode 100644 index 000000000..ad6b6383e --- /dev/null +++ b/drivers/clk/sprd/composite.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Spreadtrum composite clock driver +// +// Copyright (C) 2017 Spreadtrum, Inc. +// Author: Chunyan Zhang + +#include + +#include "composite.h" + +static int sprd_comp_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct sprd_comp *cc = hw_to_sprd_comp(hw); + + return divider_determine_rate(hw, req, NULL, cc->div.width, 0); +} + +static unsigned long sprd_comp_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct sprd_comp *cc = hw_to_sprd_comp(hw); + + return sprd_div_helper_recalc_rate(&cc->common, &cc->div, parent_rate); +} + +static int sprd_comp_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct sprd_comp *cc = hw_to_sprd_comp(hw); + + return sprd_div_helper_set_rate(&cc->common, &cc->div, + rate, parent_rate); +} + +static u8 sprd_comp_get_parent(struct clk_hw *hw) +{ + struct sprd_comp *cc = hw_to_sprd_comp(hw); + + return sprd_mux_helper_get_parent(&cc->common, &cc->mux); +} + +static int sprd_comp_set_parent(struct clk_hw *hw, u8 index) +{ + struct sprd_comp *cc = hw_to_sprd_comp(hw); + + return sprd_mux_helper_set_parent(&cc->common, &cc->mux, index); +} + +const struct clk_ops sprd_comp_ops = { + .get_parent = sprd_comp_get_parent, + .set_parent = sprd_comp_set_parent, + + .determine_rate = sprd_comp_determine_rate, + .recalc_rate = sprd_comp_recalc_rate, + .set_rate = sprd_comp_set_rate, +}; +EXPORT_SYMBOL_GPL(sprd_comp_ops); -- cgit v1.3.1