1 /* 2 * linux/fs/ext2/xattr_security.c 3 * Handler for storing security labels as extended attributes. 4 */ 5 6 #include <linux/module.h> 7 #include <linux/string.h> 8 #include <linux/fs.h> 9 #include <linux/smp_lock.h> 10 #include <linux/ext2_fs.h> 11 #include "xattr.h" 12 13 static size_t 14 ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size, 15 const char *name, size_t name_len) 16 { 17 const int prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1; 18 const size_t total_len = prefix_len + name_len + 1; 19 20 if (list && total_len <= list_size) { 21 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); 22 memcpy(list+prefix_len, name, name_len); 23 list[prefix_len + name_len] = '\0'; 24 } 25 return total_len; 26 } 27 28 static int 29 ext2_xattr_security_get(struct inode *inode, const char *name, 30 void *buffer, size_t size) 31 { 32 if (strcmp(name, "") == 0) 33 return -EINVAL; 34 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name, 35 buffer, size); 36 } 37 38 static int 39 ext2_xattr_security_set(struct inode *inode, const char *name, 40 const void *value, size_t size, int flags) 41 { 42 if (strcmp(name, "") == 0) 43 return -EINVAL; 44 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name, 45 value, size, flags); 46 } 47 48 struct xattr_handler ext2_xattr_security_handler = { 49 .prefix = XATTR_SECURITY_PREFIX, 50 .list = ext2_xattr_security_list, 51 .get = ext2_xattr_security_get, 52 .set = ext2_xattr_security_set, 53 }; 54