root/fs/jffs2/security.c

DEFINITIONS

1. jffs2_init_security
2. jffs2_security_getxattr
3. jffs2_security_setxattr
4. jffs2_security_listxattr

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2006  NEC Corporation
 *
 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include <linux/xattr.h>
#include <linux/mtd/mtd.h>
#include <linux/security.h>
#include "nodelist.h"

/* ---- Initial Security Label Attachment -------------- */
int jffs2_init_security(struct inode *inode, struct inode *dir)
{
        int rc;
        size_t len;
        void *value;
        char *name;

        rc = security_inode_init_security(inode, dir, &name, &value, &len);
        if (rc) {
                if (rc == -EOPNOTSUPP)
                        return 0;
                return rc;
        }
        rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);

        kfree(name);
        kfree(value);
        return rc;
}

/* ---- XATTR Handler for "security.*" ----------------- */
static int jffs2_security_getxattr(struct inode *inode, const char *name,
                                   void *buffer, size_t size)
{
        if (!strcmp(name, ""))
                return -EINVAL;

        return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size);
}

static int jffs2_security_setxattr(struct inode *inode, const char *name, const void *buffer,
                                   size_t size, int flags)
{
        if (!strcmp(name, ""))
                return -EINVAL;

        return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size, flags);
}

static size_t jffs2_security_listxattr(struct inode *inode, char *list, size_t list_size,
                                       const char *name, size_t name_len)
{
        size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;

        if (list && retlen <= list_size) {
                strcpy(list, XATTR_SECURITY_PREFIX);
                strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
        }

        return retlen;
}

struct xattr_handler jffs2_security_xattr_handler = {
        .prefix = XATTR_SECURITY_PREFIX,
        .list = jffs2_security_listxattr,
        .set = jffs2_security_setxattr,
        .get = jffs2_security_getxattr
};