1 /* 2 * linux/fs/ext2/xattr_trusted.c 3 * Handler for trusted extended attributes. 4 * 5 * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org> 6 */ 7 8 #include "ext2.h" 9 #include "xattr.h" 10 11 static size_t 12 ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size, 13 const char *name, size_t name_len, int type) 14 { 15 const int prefix_len = XATTR_TRUSTED_PREFIX_LEN; 16 const size_t total_len = prefix_len + name_len + 1; 17 18 if (!capable(CAP_SYS_ADMIN)) 19 return 0; 20 21 if (list && total_len <= list_size) { 22 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); 23 memcpy(list+prefix_len, name, name_len); 24 list[prefix_len + name_len] = '\0'; 25 } 26 return total_len; 27 } 28 29 static int 30 ext2_xattr_trusted_get(struct dentry *dentry, const char *name, 31 void *buffer, size_t size, int type) 32 { 33 if (strcmp(name, "") == 0) 34 return -EINVAL; 35 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name, 36 buffer, size); 37 } 38 39 static int 40 ext2_xattr_trusted_set(struct dentry *dentry, const char *name, 41 const void *value, size_t size, int flags, int type) 42 { 43 if (strcmp(name, "") == 0) 44 return -EINVAL; 45 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name, 46 value, size, flags); 47 } 48 49 const struct xattr_handler ext2_xattr_trusted_handler = { 50 .prefix = XATTR_TRUSTED_PREFIX, 51 .list = ext2_xattr_trusted_list, 52 .get = ext2_xattr_trusted_get, 53 .set = ext2_xattr_trusted_set, 54 }; 55