-/**
- * tomoyo_mount_acl - Check permission for mount() operation.
- *
- * @r: Pointer to "struct tomoyo_request_info".
- * @dev_name: Name of device file.
- * @dir: Pointer to "struct path".
- * @type: Name of filesystem type.
- * @flags: Mount options.
- *
- * Returns 0 on success, negative value otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
- struct path *dir, char *type, unsigned long flags)
-{
- int error;
- error = -EPERM;
- if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
- flags &= ~MS_MGC_MSK;
- switch (flags & (MS_REMOUNT | MS_MOVE | MS_BIND)) {
- case MS_REMOUNT:
- case MS_MOVE:
- case MS_BIND:
- case 0:
- break;
- default:
- printk(KERN_WARNING "ERROR: "
- "%s%s%sare given for single mount operation.\n",
- flags & MS_REMOUNT ? "'remount' " : "",
- flags & MS_MOVE ? "'move' " : "",
- flags & MS_BIND ? "'bind' " : "");
- return -EINVAL;
- }
- switch (flags & (MS_UNBINDABLE | MS_PRIVATE | MS_SLAVE | MS_SHARED)) {
- case MS_UNBINDABLE:
- case MS_PRIVATE:
- case MS_SLAVE:
- case MS_SHARED:
- case 0:
- break;
- default:
- printk(KERN_WARNING "ERROR: "
- "%s%s%s%sare given for single mount operation.\n",
- flags & MS_UNBINDABLE ? "'unbindable' " : "",
- flags & MS_PRIVATE ? "'private' " : "",
- flags & MS_SLAVE ? "'slave' " : "",
- flags & MS_SHARED ? "'shared' " : "");
- return -EINVAL;
- }
- if (flags & MS_REMOUNT)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_REMOUNT_KEYWORD,
- flags & ~MS_REMOUNT);
- else if (flags & MS_MOVE)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_MOVE_KEYWORD,
- flags & ~MS_MOVE);
- else if (flags & MS_BIND)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_BIND_KEYWORD,
- flags & ~MS_BIND);
- else if (flags & MS_UNBINDABLE)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD,
- flags & ~MS_UNBINDABLE);
- else if (flags & MS_PRIVATE)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD,
- flags & ~MS_PRIVATE);
- else if (flags & MS_SLAVE)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD,
- flags & ~MS_SLAVE);
- else if (flags & MS_SHARED)
- error = tomoyo_mount_acl(r, dev_name, dir,
- TOMOYO_MOUNT_MAKE_SHARED_KEYWORD,
- flags & ~MS_SHARED);
- else
- do {
- error = tomoyo_mount_acl2(r, dev_name, dir, type,
- flags);
- } while (error == TOMOYO_RETRY_REQUEST);
- if (r->mode != TOMOYO_CONFIG_ENFORCING)
- error = 0;
- return error;
-}
-