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(s) Attachment callback --- */
  26 static int jffs2_initxattrs(struct inode *inode,
  27                             const struct xattr *xattr_array, void *fs_info)
  28 {
  29         const struct xattr *xattr;
  30         int err = 0;
  31
  32         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  33                 err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
  34                                         xattr->name, xattr->value,
  35                                         xattr->value_len, 0);
  36                 if (err < 0)
  37                         break;
  38         }
  39         return err;
  40 }
  41
  42 /* ---- Initial Security Label(s) Attachment ----------- */
  43 int jffs2_init_security(struct inode *inode, struct inode *dir,
  44                         const struct qstr *qstr)
  45 {
  46         return security_inode_init_security(inode, dir, qstr,
  47                                             &jffs2_initxattrs, NULL);
  48 }
  49
  50 /* ---- XATTR Handler for "security.*" ----------------- */
  51 static int jffs2_security_getxattr(const struct xattr_handler *handler,
  52                                    struct dentry *dentry, const char *name,
  53                                    void *buffer, size_t size)
  54 {
  55         if (!strcmp(name, ""))
  56                 return -EINVAL;
  57
  58         return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY,
  59                                  name, buffer, size);
  60 }
  61
  62 static int jffs2_security_setxattr(const struct xattr_handler *handler,
  63                                    struct dentry *dentry, const char *name,
  64                                    const void *buffer, size_t size, int flags)
  65 {
  66         if (!strcmp(name, ""))
  67                 return -EINVAL;
  68
  69         return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY,
  70                                  name, buffer, size, flags);
  71 }
  72
  73 static size_t jffs2_security_listxattr(const struct xattr_handler *handler,
  74                                        struct dentry *dentry, char *list,
  75                                        size_t list_size, const char *name,
  76                                        size_t name_len)
  77 {
  78         size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
  79
  80         if (list && retlen <= list_size) {
  81                 strcpy(list, XATTR_SECURITY_PREFIX);
  82                 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
  83         }
  84
  85         return retlen;
  86 }
  87
  88 const struct xattr_handler jffs2_security_xattr_handler = {
  89         .prefix = XATTR_SECURITY_PREFIX,
  90         .list = jffs2_security_listxattr,
  91         .set = jffs2_security_setxattr,
  92         .get = jffs2_security_getxattr
  93 };