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/net/wext.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 include/net/wext.h (limited to 'include/net/wext.h') diff --git a/include/net/wext.h b/include/net/wext.h new file mode 100644 index 000000000..aa192a670 --- /dev/null +++ b/include/net/wext.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NET_WEXT_H +#define __NET_WEXT_H + +#include + +struct net; + +#ifdef CONFIG_WEXT_CORE +int wext_handle_ioctl(struct net *net, unsigned int cmd, + void __user *arg); +int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, + unsigned long arg); + +struct iw_statistics *get_wireless_stats(struct net_device *dev); +int call_commit_handler(struct net_device *dev); +#else +static inline int wext_handle_ioctl(struct net *net, unsigned int cmd, + void __user *arg) +{ + return -EINVAL; +} +static inline int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, + unsigned long arg) +{ + return -EINVAL; +} +#endif + +#ifdef CONFIG_WEXT_PROC +int wext_proc_init(struct net *net); +void wext_proc_exit(struct net *net); +#else +static inline int wext_proc_init(struct net *net) +{ + return 0; +} +static inline void wext_proc_exit(struct net *net) +{ + return; +} +#endif + +#ifdef CONFIG_WEXT_PRIV +int ioctl_private_call(struct net_device *dev, struct iwreq *iwr, + unsigned int cmd, struct iw_request_info *info, + iw_handler handler); +int compat_private_call(struct net_device *dev, struct iwreq *iwr, + unsigned int cmd, struct iw_request_info *info, + iw_handler handler); +int iw_handler_get_private(struct net_device * dev, + struct iw_request_info * info, + union iwreq_data * wrqu, + char * extra); +#else +#define ioctl_private_call NULL +#define compat_private_call NULL +#endif + + +#endif /* __NET_WEXT_H */ -- cgit v1.3.1