1 /* 2 * linux/fs/ext2/xattr_security.c 3 * Handler for storing security labels as extended attributes. 4 */ 5 6 #include "ext2.h" 7 #include <linux/security.h> 8 #include "xattr.h" 9 10 static size_t 11 ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, 12 const char *name, size_t name_len, int type) 13 { 14 const int prefix_len = XATTR_SECURITY_PREFIX_LEN; 15 const size_t total_len = prefix_len + name_len + 1; 16 17 if (list && total_len <= list_size) { 18 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); 19 memcpy(list+prefix_len, name, name_len); 20 list[prefix_len + name_len] = '\0'; 21 } 22 return total_len; 23 } 24 25 static int 26 ext2_xattr_security_get(struct dentry *dentry, const char *name, 27 void *buffer, size_t size, int type) 28 { 29 if (strcmp(name, "") == 0) 30 return -EINVAL; 31 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name, 32 buffer, size); 33 } 34 35 static int 36 ext2_xattr_security_set(struct dentry *dentry, const char *name, 37 const void *value, size_t size, int flags, int type) 38 { 39 if (strcmp(name, "") == 0) 40 return -EINVAL; 41 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name, 42 value, size, flags); 43 } 44 45 int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 46 void *fs_info) 47 { 48 const struct xattr *xattr; 49 int err = 0; 50 51 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 52 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, 53 xattr->name, xattr->value, 54 xattr->value_len, 0); 55 if (err < 0) 56 break; 57 } 58 return err; 59 } 60 61 int 62 ext2_init_security(struct inode *inode, struct inode *dir, 63 const struct qstr *qstr) 64 { 65 return security_inode_init_security(inode, dir, qstr, 66 &ext2_initxattrs, NULL); 67 } 68 69 const struct xattr_handler ext2_xattr_security_handler = { 70 .prefix = XATTR_SECURITY_PREFIX, 71 .list = ext2_xattr_security_list, 72 .get = ext2_xattr_security_get, 73 .set = ext2_xattr_security_set, 74 }; 75