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/net/phy/phylib.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 drivers/net/phy/phylib.h (limited to 'drivers/net/phy/phylib.h') diff --git a/drivers/net/phy/phylib.h b/drivers/net/phy/phylib.h new file mode 100644 index 000000000..c6e26ac6b --- /dev/null +++ b/drivers/net/phy/phylib.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * phylib header + */ + +#ifndef __PHYLIB_H +#define __PHYLIB_H + +struct device_node; +struct phy_device; +struct mii_bus; + +struct device_node *phy_package_get_node(struct phy_device *phydev); +void *phy_package_get_priv(struct phy_device *phydev); +void phy_package_lock(struct phy_device *phydev); +void phy_package_unlock(struct phy_device *phydev); +int __phy_package_read(struct phy_device *phydev, unsigned int addr_offset, + u32 regnum); +int __phy_package_write(struct phy_device *phydev, unsigned int addr_offset, + u32 regnum, u16 val); +int __phy_package_read_mmd(struct phy_device *phydev, + unsigned int addr_offset, int devad, + u32 regnum); +int __phy_package_write_mmd(struct phy_device *phydev, + unsigned int addr_offset, int devad, + u32 regnum, u16 val); +bool phy_package_init_once(struct phy_device *phydev); +bool phy_package_probe_once(struct phy_device *phydev); +int phy_package_join(struct phy_device *phydev, int base_addr, size_t priv_size); +int of_phy_package_join(struct phy_device *phydev, size_t priv_size); +void phy_package_leave(struct phy_device *phydev); +int devm_phy_package_join(struct device *dev, struct phy_device *phydev, + int base_addr, size_t priv_size); +int devm_of_phy_package_join(struct device *dev, struct phy_device *phydev, + size_t priv_size); +int mmd_phy_read(struct mii_bus *bus, int phy_addr, bool is_c45, + int devad, u32 regnum); +int mmd_phy_write(struct mii_bus *bus, int phy_addr, bool is_c45, + int devad, u32 regnum, u16 val); + +#endif /* __PHYLIB_H */ -- cgit v1.3.1