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 const struct qstr *qstr) 28 { 29 int rc; 30 size_t len; 31 void *value; 32 char *name; 33 34 rc = security_inode_init_security(inode, dir, qstr, &name, &value, &len); 35 if (rc) { 36 if (rc == -EOPNOTSUPP) 37 return 0; 38 return rc; 39 } 40 rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0); 41 42 kfree(name); 43 kfree(value); 44 return rc; 45 } 46 47 /* ---- XATTR Handler for "security.*" ----------------- */ 48 static int jffs2_security_getxattr(struct dentry *dentry, const char *name, 49 void *buffer, size_t size, int type) 50 { 51 if (!strcmp(name, "")) 52 return -EINVAL; 53 54 return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY, 55 name, buffer, size); 56 } 57 58 static int jffs2_security_setxattr(struct dentry *dentry, const char *name, 59 const void *buffer, size_t size, int flags, int type) 60 { 61 if (!strcmp(name, "")) 62 return -EINVAL; 63 64 return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY, 65 name, buffer, size, flags); 66 } 67 68 static size_t jffs2_security_listxattr(struct dentry *dentry, char *list, 69 size_t list_size, const char *name, size_t name_len, int type) 70 { 71 size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1; 72 73 if (list && retlen <= list_size) { 74 strcpy(list, XATTR_SECURITY_PREFIX); 75 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name); 76 } 77 78 return retlen; 79 } 80 81 const struct xattr_handler jffs2_security_xattr_handler = { 82 .prefix = XATTR_SECURITY_PREFIX, 83 .list = jffs2_security_listxattr, 84 .set = jffs2_security_setxattr, 85 .get = jffs2_security_getxattr 86 }; 87