1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2006 NEC Corporation 5 * 6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/fs.h> 14 #include <linux/time.h> 15 #include <linux/pagemap.h> 16 #include <linux/highmem.h> 17 #include <linux/crc32.h> 18 #include <linux/jffs2.h> 19 #include <linux/xattr.h> 20 #include <linux/mtd/mtd.h> 21 #include <linux/security.h> 22 #include "nodelist.h" 23 24 /* ---- Initial Security Label Attachment -------------- */ 25 int jffs2_init_security(struct inode *inode, struct inode *dir) 26 { 27 int rc; 28 size_t len; 29 void *value; 30 char *name; 31 32 rc = security_inode_init_security(inode, dir, &name, &value, &len); 33 if (rc) { 34 if (rc == -EOPNOTSUPP) 35 return 0; 36 return rc; 37 } 38 rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0); 39 40 kfree(name); 41 kfree(value); 42 return rc; 43 } 44 45 /* ---- XATTR Handler for "security.*" ----------------- */ 46 static int jffs2_security_getxattr(struct inode *inode, const char *name, 47 void *buffer, size_t size) 48 { 49 if (!strcmp(name, "")) 50 return -EINVAL; 51 52 return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size); 53 } 54 55 static int jffs2_security_setxattr(struct inode *inode, const char *name, const void *buffer, 56 size_t size, int flags) 57 { 58 if (!strcmp(name, "")) 59 return -EINVAL; 60 61 return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size, flags); 62 } 63 64 static size_t jffs2_security_listxattr(struct inode *inode, char *list, size_t list_size, 65 const char *name, size_t name_len) 66 { 67 size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1; 68 69 if (list && retlen <= list_size) { 70 strcpy(list, XATTR_SECURITY_PREFIX); 71 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name); 72 } 73 74 return retlen; 75 } 76 77 struct xattr_handler jffs2_security_xattr_handler = { 78 .prefix = XATTR_SECURITY_PREFIX, 79 .list = jffs2_security_listxattr, 80 .set = jffs2_security_setxattr, 81 .get = jffs2_security_getxattr 82 }; 83