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 inode *inode, const char *name, void *buffer, size_t size) 12 { 13 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 14 return -EINVAL; 15 16 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)) 17 return -EPERM; 18 19 return reiserfs_xattr_get(inode, name, buffer, size); 20 } 21 22 static int 23 trusted_set(struct inode *inode, const char *name, const void *buffer, 24 size_t size, int flags) 25 { 26 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 27 return -EINVAL; 28 29 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)) 30 return -EPERM; 31 32 return reiserfs_xattr_set(inode, name, buffer, size, flags); 33 } 34 35 static size_t trusted_list(struct inode *inode, char *list, size_t list_size, 36 const char *name, size_t name_len) 37 { 38 const size_t len = name_len + 1; 39 40 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode)) 41 return 0; 42 43 if (list && len <= list_size) { 44 memcpy(list, name, name_len); 45 list[name_len] = '\0'; 46 } 47 return len; 48 } 49 50 struct xattr_handler reiserfs_xattr_trusted_handler = { 51 .prefix = XATTR_TRUSTED_PREFIX, 52 .get = trusted_get, 53 .set = trusted_set, 54 .list = trusted_list, 55 }; 56