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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-09-04 10:43:19 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 07:58:36 -0700 |
| commit | 6668ed271eaefaa63e686bdfbedaeb7b8e492722 (patch) | |
| tree | 58e8288fead484f6755ad0815fc74c3742663761 /drivers/clk/qcom/clk-regmap.h | |
| download | linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.tar.gz linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.zip | |
selftests/bpf: Reject graph kptr use after RCU unlockgrafted
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 <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/clk/qcom/clk-regmap.h')
| -rw-r--r-- | drivers/clk/qcom/clk-regmap.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-regmap.h b/drivers/clk/qcom/clk-regmap.h new file mode 100644 index 000000000..14ec659a3 --- /dev/null +++ b/drivers/clk/qcom/clk-regmap.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2014, The Linux Foundation. All rights reserved. */ + +#ifndef __QCOM_CLK_REGMAP_H__ +#define __QCOM_CLK_REGMAP_H__ + +#include <linux/clk-provider.h> + +struct regmap; + +/** + * struct clk_regmap - regmap supporting clock + * @hw: handle between common and hardware-specific interfaces + * @regmap: regmap to use for regmap helpers and/or by providers + * @enable_reg: register when using regmap enable/disable ops + * @enable_mask: mask when using regmap enable/disable ops + * @enable_is_inverted: flag to indicate set enable_mask bits to disable + * when using clock_enable_regmap and friends APIs. + */ +struct clk_regmap { + struct clk_hw hw; + struct regmap *regmap; + unsigned int enable_reg; + unsigned int enable_mask; + bool enable_is_inverted; +}; + +static inline struct clk_regmap *to_clk_regmap(struct clk_hw *hw) +{ + return container_of(hw, struct clk_regmap, hw); +} + +int clk_is_enabled_regmap(struct clk_hw *hw); +int clk_enable_regmap(struct clk_hw *hw); +void clk_disable_regmap(struct clk_hw *hw); +int devm_clk_register_regmap(struct device *dev, struct clk_regmap *rclk); + +#endif |