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/actions/owl-composite.c | 207 ++++++++++++++++++++++++++++++++++++ 1 file changed, 207 insertions(+) create mode 100644 drivers/clk/actions/owl-composite.c (limited to 'drivers/clk/actions/owl-composite.c') diff --git a/drivers/clk/actions/owl-composite.c b/drivers/clk/actions/owl-composite.c new file mode 100644 index 000000000..954044430 --- /dev/null +++ b/drivers/clk/actions/owl-composite.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// OWL composite clock driver +// +// Copyright (c) 2014 Actions Semi Inc. +// Author: David Liu +// +// Copyright (c) 2018 Linaro Ltd. +// Author: Manivannan Sadhasivam + +#include +#include + +#include "owl-composite.h" + +static u8 owl_comp_get_parent(struct clk_hw *hw) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + + return owl_mux_helper_get_parent(&comp->common, &comp->mux_hw); +} + +static int owl_comp_set_parent(struct clk_hw *hw, u8 index) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + + return owl_mux_helper_set_parent(&comp->common, &comp->mux_hw, index); +} + +static void owl_comp_disable(struct clk_hw *hw) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + struct owl_clk_common *common = &comp->common; + + owl_gate_set(common, &comp->gate_hw, false); +} + +static int owl_comp_enable(struct clk_hw *hw) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + struct owl_clk_common *common = &comp->common; + + owl_gate_set(common, &comp->gate_hw, true); + + return 0; +} + +static int owl_comp_is_enabled(struct clk_hw *hw) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + struct owl_clk_common *common = &comp->common; + + return owl_gate_clk_is_enabled(common, &comp->gate_hw); +} + +static int owl_comp_div_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + struct owl_divider_hw *div = &comp->rate.div_hw; + + return divider_determine_rate(&comp->common.hw, req, div->table, + div->width, div->div_flags); +} + +static unsigned long owl_comp_div_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + + return owl_divider_helper_recalc_rate(&comp->common, &comp->rate.div_hw, + parent_rate); +} + +static int owl_comp_div_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + + return owl_divider_helper_set_rate(&comp->common, &comp->rate.div_hw, + rate, parent_rate); +} + +static int owl_comp_fact_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + long rate; + + rate = owl_factor_helper_round_rate(&comp->common, + &comp->rate.factor_hw, + req->rate, &req->best_parent_rate); + if (rate < 0) + return rate; + + req->rate = rate; + return 0; +} + +static unsigned long owl_comp_fact_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + + return owl_factor_helper_recalc_rate(&comp->common, + &comp->rate.factor_hw, + parent_rate); +} + +static int owl_comp_fact_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + + return owl_factor_helper_set_rate(&comp->common, + &comp->rate.factor_hw, + rate, parent_rate); +} + +static int owl_comp_fix_fact_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + struct clk_fixed_factor *fix_fact_hw = &comp->rate.fix_fact_hw; + + return comp->fix_fact_ops->determine_rate(&fix_fact_hw->hw, req); +} + +static unsigned long owl_comp_fix_fact_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct owl_composite *comp = hw_to_owl_comp(hw); + struct clk_fixed_factor *fix_fact_hw = &comp->rate.fix_fact_hw; + + return comp->fix_fact_ops->recalc_rate(&fix_fact_hw->hw, parent_rate); + +} + +static int owl_comp_fix_fact_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + /* + * We must report success but we can do so unconditionally because + * owl_comp_fix_fact_round_rate returns values that ensure this call is + * a nop. + */ + + return 0; +} + +const struct clk_ops owl_comp_div_ops = { + /* mux_ops */ + .get_parent = owl_comp_get_parent, + .set_parent = owl_comp_set_parent, + + /* gate_ops */ + .disable = owl_comp_disable, + .enable = owl_comp_enable, + .is_enabled = owl_comp_is_enabled, + + /* div_ops */ + .determine_rate = owl_comp_div_determine_rate, + .recalc_rate = owl_comp_div_recalc_rate, + .set_rate = owl_comp_div_set_rate, +}; + + +const struct clk_ops owl_comp_fact_ops = { + /* mux_ops */ + .get_parent = owl_comp_get_parent, + .set_parent = owl_comp_set_parent, + + /* gate_ops */ + .disable = owl_comp_disable, + .enable = owl_comp_enable, + .is_enabled = owl_comp_is_enabled, + + /* fact_ops */ + .determine_rate = owl_comp_fact_determine_rate, + .recalc_rate = owl_comp_fact_recalc_rate, + .set_rate = owl_comp_fact_set_rate, +}; + +const struct clk_ops owl_comp_fix_fact_ops = { + /* gate_ops */ + .disable = owl_comp_disable, + .enable = owl_comp_enable, + .is_enabled = owl_comp_is_enabled, + + /* fix_fact_ops */ + .determine_rate = owl_comp_fix_fact_determine_rate, + .recalc_rate = owl_comp_fix_fact_recalc_rate, + .set_rate = owl_comp_fix_fact_set_rate, +}; + + +const struct clk_ops owl_comp_pass_ops = { + /* mux_ops */ + .determine_rate = clk_hw_determine_rate_no_reparent, + .get_parent = owl_comp_get_parent, + .set_parent = owl_comp_set_parent, + + /* gate_ops */ + .disable = owl_comp_disable, + .enable = owl_comp_enable, + .is_enabled = owl_comp_is_enabled, +}; -- cgit v1.3.1