1 #include "reiserfs.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 "xattr.h" 8 #include <linux/uaccess.h> 9 10 static int 11 trusted_get(const struct xattr_handler *handler, struct dentry *dentry, 12 const char *name, void *buffer, size_t size) 13 { 14 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 15 return -EINVAL; 16 17 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry))) 18 return -EPERM; 19 20 return reiserfs_xattr_get(d_inode(dentry), name, buffer, size); 21 } 22 23 static int 24 trusted_set(const struct xattr_handler *handler, struct dentry *dentry, 25 const char *name, const void *buffer, size_t size, int flags) 26 { 27 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 28 return -EINVAL; 29 30 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry))) 31 return -EPERM; 32 33 return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags); 34 } 35 36 static size_t trusted_list(const struct xattr_handler *handler, 37 struct dentry *dentry, char *list, size_t list_size, 38 const char *name, size_t name_len) 39 { 40 const size_t len = name_len + 1; 41 42 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry))) 43 return 0; 44 45 if (list && len <= list_size) { 46 memcpy(list, name, name_len); 47 list[name_len] = '\0'; 48 } 49 return len; 50 } 51 52 const struct xattr_handler reiserfs_xattr_trusted_handler = { 53 .prefix = XATTR_TRUSTED_PREFIX, 54 .get = trusted_get, 55 .set = trusted_set, 56 .list = trusted_list, 57 }; 58