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 <linux/module.h> 9 #include <linux/string.h> 10 #include <linux/capability.h> 11 #include <linux/fs.h> 12 #include <linux/ext2_fs.h> 13 #include "xattr.h" 14 15 #define XATTR_TRUSTED_PREFIX "trusted." 16 17 static size_t 18 ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, 19 const char *name, size_t name_len) 20 { 21 const int prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1; 22 const size_t total_len = prefix_len + name_len + 1; 23 24 if (!capable(CAP_SYS_ADMIN)) 25 return 0; 26 27 if (list && total_len <= list_size) { 28 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); 29 memcpy(list+prefix_len, name, name_len); 30 list[prefix_len + name_len] = '\0'; 31 } 32 return total_len; 33 } 34 35 static int 36 ext2_xattr_trusted_get(struct inode *inode, const char *name, 37 void *buffer, size_t size) 38 { 39 if (strcmp(name, "") == 0) 40 return -EINVAL; 41 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name, 42 buffer, size); 43 } 44 45 static int 46 ext2_xattr_trusted_set(struct inode *inode, const char *name, 47 const void *value, size_t size, int flags) 48 { 49 if (strcmp(name, "") == 0) 50 return -EINVAL; 51 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name, 52 value, size, flags); 53 } 54 55 struct xattr_handler ext2_xattr_trusted_handler = { 56 .prefix = XATTR_TRUSTED_PREFIX, 57 .list = ext2_xattr_trusted_list, 58 .get = ext2_xattr_trusted_get, 59 .set = ext2_xattr_trusted_set, 60 }; 61