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 --- fs/jffs2/acl.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 fs/jffs2/acl.h (limited to 'fs/jffs2/acl.h') diff --git a/fs/jffs2/acl.h b/fs/jffs2/acl.h new file mode 100644 index 000000000..e976b8cb8 --- /dev/null +++ b/fs/jffs2/acl.h @@ -0,0 +1,43 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright © 2006 NEC Corporation + * + * Created by KaiGai Kohei + * + * For licensing information, see the file 'LICENCE' in this directory. + * + */ + +struct jffs2_acl_entry { + jint16_t e_tag; + jint16_t e_perm; + jint32_t e_id; +}; + +struct jffs2_acl_entry_short { + jint16_t e_tag; + jint16_t e_perm; +}; + +struct jffs2_acl_header { + jint32_t a_version; + struct jffs2_acl_entry a_entries[]; +}; + +#ifdef CONFIG_JFFS2_FS_POSIX_ACL + +struct posix_acl *jffs2_get_acl(struct inode *inode, int type, bool rcu); +int jffs2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, + struct posix_acl *acl, int type); +extern int jffs2_init_acl_pre(struct inode *, struct inode *, umode_t *); +extern int jffs2_init_acl_post(struct inode *); + +#else + +#define jffs2_get_acl (NULL) +#define jffs2_set_acl (NULL) +#define jffs2_init_acl_pre(dir_i,inode,mode) (0) +#define jffs2_init_acl_post(inode) (0) + +#endif /* CONFIG_JFFS2_FS_POSIX_ACL */ -- cgit v1.3.1