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 --- include/soc/qcom/cmd-db.h | 48 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 include/soc/qcom/cmd-db.h (limited to 'include/soc/qcom/cmd-db.h') diff --git a/include/soc/qcom/cmd-db.h b/include/soc/qcom/cmd-db.h new file mode 100644 index 000000000..47a6cab75 --- /dev/null +++ b/include/soc/qcom/cmd-db.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#ifndef __QCOM_COMMAND_DB_H__ +#define __QCOM_COMMAND_DB_H__ + +#include + +enum cmd_db_hw_type { + CMD_DB_HW_INVALID = 0, + CMD_DB_HW_MIN = 3, + CMD_DB_HW_ARC = CMD_DB_HW_MIN, + CMD_DB_HW_VRM = 4, + CMD_DB_HW_BCM = 5, + CMD_DB_HW_MAX = CMD_DB_HW_BCM, + CMD_DB_HW_ALL = 0xff, +}; + +#if IS_ENABLED(CONFIG_QCOM_COMMAND_DB) +u32 cmd_db_read_addr(const char *resource_id); + +const void *cmd_db_read_aux_data(const char *resource_id, size_t *len); + +bool cmd_db_match_resource_addr(u32 addr1, u32 addr2); + +enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id); + +int cmd_db_ready(void); +#else +static inline u32 cmd_db_read_addr(const char *resource_id) +{ return 0; } + +static inline const void *cmd_db_read_aux_data(const char *resource_id, size_t *len) +{ return ERR_PTR(-ENODEV); } + +static inline bool cmd_db_match_resource_addr(u32 addr1, u32 addr2) +{ return false; } + +static inline enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id) +{ return -ENODEV; } + +static inline int cmd_db_ready(void) +{ return -ENODEV; } +#endif /* CONFIG_QCOM_COMMAND_DB */ +#endif /* __QCOM_COMMAND_DB_H__ */ -- cgit v1.3.1