* if mount(2) passes something like "context=foo" with MS_REMOUNT
in flags (/sbin/mount.nfs will _not_ do that - you need to issue
the syscall manually), you'll get leaked copies for LSM options.
The reason is that instead of nfs_{alloc,free}_parsed_mount_data()
nfs_remount() uses kzalloc/kfree, which lacks the needed cleanup.
* selinux options are not changed on remount (as for any other
fs), but in case of NFS the failure is quiet - they are not compared
to what we used to have, with complaint in case of attempted changes.
Trivially fixed by converting to use of security_sb_remount().
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
options->version <= 6))))
return 0;
- data = kzalloc(sizeof(*data), GFP_KERNEL);
+ data = nfs_alloc_parsed_mount_data();
if (data == NULL)
return -ENOMEM;
/* compare new mount options with old ones */
error = nfs_compare_remount_data(nfss, data);
+ if (!error)
+ error = security_sb_remount(sb, &data->lsm_opts);
out:
- kfree(data);
+ nfs_free_parsed_mount_data(data);
return error;
}
EXPORT_SYMBOL_GPL(nfs_remount);