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/sfp.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 drivers/net/phy/sfp.h (limited to 'drivers/net/phy/sfp.h') diff --git a/drivers/net/phy/sfp.h b/drivers/net/phy/sfp.h new file mode 100644 index 000000000..19fe29d84 --- /dev/null +++ b/drivers/net/phy/sfp.h @@ -0,0 +1,45 @@ +#ifndef SFP_H +#define SFP_H + +#include +#include + +struct sfp; + +struct sfp_quirk { + const char *vendor; + const char *part; + void (*support)(const struct sfp_eeprom_id *id, + struct sfp_module_caps *caps); + void (*fixup)(struct sfp *sfp); + bool part_prefix_match; +}; + +struct sfp_socket_ops { + void (*attach)(struct sfp *sfp); + void (*detach)(struct sfp *sfp); + void (*start)(struct sfp *sfp); + void (*stop)(struct sfp *sfp); + void (*set_signal_rate)(struct sfp *sfp, unsigned int rate_kbd); + int (*module_info)(struct sfp *sfp, struct ethtool_modinfo *modinfo); + int (*module_eeprom)(struct sfp *sfp, struct ethtool_eeprom *ee, + u8 *data); + int (*module_eeprom_by_page)(struct sfp *sfp, + const struct ethtool_module_eeprom *page, + struct netlink_ext_ack *extack); +}; + +int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev); +void sfp_remove_phy(struct sfp_bus *bus); +void sfp_link_up(struct sfp_bus *bus); +void sfp_link_down(struct sfp_bus *bus); +int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id, + const struct sfp_quirk *quirk); +void sfp_module_remove(struct sfp_bus *bus); +int sfp_module_start(struct sfp_bus *bus); +void sfp_module_stop(struct sfp_bus *bus); +struct sfp_bus *sfp_register_socket(struct device *dev, struct sfp *sfp, + const struct sfp_socket_ops *ops); +void sfp_unregister_socket(struct sfp_bus *bus); + +#endif -- cgit v1.3.1