1 #include <linux/reiserfs_fs.h> 2 #include <linux/capability.h> 3 #include <linux/errno.h> 4 #include <linux/fs.h> 5 #include <linux/pagemap.h> 6 #include <linux/xattr.h> 7 #include <linux/reiserfs_xattr.h> 8 #include <asm/uaccess.h> 9 10 static int 11 trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size, 12 int handler_flags) 13 { 14 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 15 return -EINVAL; 16 17 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode)) 18 return -EPERM; 19 20 return reiserfs_xattr_get(dentry->d_inode, name, buffer, size); 21 } 22 23 static int 24 trusted_set(struct dentry *dentry, const char *name, const void *buffer, 25 size_t size, int flags, int handler_flags) 26 { 27 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 28 return -EINVAL; 29 30 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode)) 31 return -EPERM; 32 33 return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags); 34 } 35 36 static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size, 37 const char *name, size_t name_len, int handler_flags) 38 { 39 const size_t len = name_len + 1; 40 41 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode)) 42 return 0; 43 44 if (list && len <= list_size) { 45 memcpy(list, name, name_len); 46 list[name_len] = '\0'; 47 } 48 return len; 49 } 50 51 const struct xattr_handler reiserfs_xattr_trusted_handler = { 52 .prefix = XATTR_TRUSTED_PREFIX, 53 .get = trusted_get, 54 .set = trusted_set, 55 .list = trusted_list, 56 }; 57