fs/jffs2/security.c

   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 };