1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 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 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/fs.h> 15 #include <linux/time.h> 16 #include <linux/pagemap.h> 17 #include <linux/highmem.h> 18 #include <linux/crc32.h> 19 #include <linux/jffs2.h> 20 #include <linux/xattr.h> 21 #include <linux/mtd/mtd.h> 22 #include <linux/security.h> 23 #include "nodelist.h" 24 25 /* ---- Initial Security Label Attachment -------------- */ 26 int jffs2_init_security(struct inode *inode, struct inode *dir) 27 { 28 int rc; 29 size_t len; 30 void *value; 31 char *name; 32 33 rc = security_inode_init_security(inode, dir, &name, &value, &len); 34 if (rc) { 35 if (rc == -EOPNOTSUPP) 36 return 0; 37 return rc; 38 } 39 rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0); 40 41 kfree(name); 42 kfree(value); 43 return rc; 44 } 45 46 /* ---- XATTR Handler for "security.*" ----------------- */ 47 static int jffs2_security_getxattr(struct inode *inode, const char *name, 48 void *buffer, size_t size) 49 { 50 if (!strcmp(name, "")) 51 return -EINVAL; 52 53 return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size); 54 } 55 56 static int jffs2_security_setxattr(struct inode *inode, const char *name, const void *buffer, 57 size_t size, int flags) 58 { 59 if (!strcmp(name, "")) 60 return -EINVAL; 61 62 return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size, flags); 63 } 64 65 static size_t jffs2_security_listxattr(struct inode *inode, char *list, size_t list_size, 66 const char *name, size_t name_len) 67 { 68 size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1; 69 70 if (list && retlen <= list_size) { 71 strcpy(list, XATTR_SECURITY_PREFIX); 72 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name); 73 } 74 75 return retlen; 76 } 77 78 struct xattr_handler jffs2_security_xattr_handler = { 79 .prefix = XATTR_SECURITY_PREFIX, 80 .list = jffs2_security_listxattr, 81 .set = jffs2_security_setxattr, 82 .get = jffs2_security_getxattr 83 }; 84