From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- fs/ext2/xattr.h | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 fs/ext2/xattr.h (limited to 'fs/ext2/xattr.h') diff --git a/fs/ext2/xattr.h b/fs/ext2/xattr.h new file mode 100644 index 000000000..6a4966949 --- /dev/null +++ b/fs/ext2/xattr.h @@ -0,0 +1,116 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + File: linux/ext2_xattr.h + + On-disk format of extended attributes for the ext2 filesystem. + + (C) 2001 Andreas Gruenbacher, +*/ + +#include +#include + +/* Magic value in attribute blocks */ +#define EXT2_XATTR_MAGIC 0xEA020000 + +/* Maximum number of references to one attribute block */ +#define EXT2_XATTR_REFCOUNT_MAX 1024 + +/* Name indexes */ +#define EXT2_XATTR_INDEX_USER 1 +#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2 +#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3 +#define EXT2_XATTR_INDEX_TRUSTED 4 +#define EXT2_XATTR_INDEX_LUSTRE 5 +#define EXT2_XATTR_INDEX_SECURITY 6 + +struct ext2_xattr_header { + __le32 h_magic; /* magic number for identification */ + __le32 h_refcount; /* reference count */ + __le32 h_blocks; /* number of disk blocks used */ + __le32 h_hash; /* hash value of all attributes */ + __u32 h_reserved[4]; /* zero right now */ +}; + +struct ext2_xattr_entry { + __u8 e_name_len; /* length of name */ + __u8 e_name_index; /* attribute name index */ + __le16 e_value_offs; /* offset in disk block of value */ + __le32 e_value_block; /* disk block attribute is stored on (n/i) */ + __le32 e_value_size; /* size of attribute value */ + __le32 e_hash; /* hash value of name and value */ + char e_name[]; /* attribute name */ +}; + +#define EXT2_XATTR_PAD_BITS 2 +#define EXT2_XATTR_PAD (1<e_name_len)) ) +#define EXT2_XATTR_SIZE(size) \ + (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND) + +struct mb_cache; + +# ifdef CONFIG_EXT2_FS_XATTR + +extern const struct xattr_handler ext2_xattr_user_handler; +extern const struct xattr_handler ext2_xattr_trusted_handler; +extern const struct xattr_handler ext2_xattr_security_handler; + +extern ssize_t ext2_listxattr(struct dentry *, char *, size_t); + +extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t); +extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int); + +extern void ext2_xattr_delete_inode(struct inode *); + +extern struct mb_cache *ext2_xattr_create_cache(void); +extern void ext2_xattr_destroy_cache(struct mb_cache *cache); + +extern const struct xattr_handler * const ext2_xattr_handlers[]; + +# else /* CONFIG_EXT2_FS_XATTR */ + +static inline int +ext2_xattr_get(struct inode *inode, int name_index, + const char *name, void *buffer, size_t size) +{ + return -EOPNOTSUPP; +} + +static inline int +ext2_xattr_set(struct inode *inode, int name_index, const char *name, + const void *value, size_t size, int flags) +{ + return -EOPNOTSUPP; +} + +static inline void +ext2_xattr_delete_inode(struct inode *inode) +{ +} + +static inline void ext2_xattr_destroy_cache(struct mb_cache *cache) +{ +} + +#define ext2_xattr_handlers NULL +#define ext2_listxattr NULL + +# endif /* CONFIG_EXT2_FS_XATTR */ + +#ifdef CONFIG_EXT2_FS_SECURITY +extern int ext2_init_security(struct inode *inode, struct inode *dir, + const struct qstr *qstr); +#else +static inline int ext2_init_security(struct inode *inode, struct inode *dir, + const struct qstr *qstr) +{ + return 0; +} +#endif -- cgit v1.3.1