You should already have the proper functionality in 3.18. See if you have:

commit b43e725d8d386bf2092473953b525aaae71b6c28

Author: Eric Paris <epa...@redhat.com>

Date:   Wed Oct 10 14:27:35 2012 -0400

   SELinux: use a helper function to determine seclabel

On Tue, Oct 20, 2015 at 6:58 PM YongQin Liu <yongqin....@linaro.org> wrote:

> Hi, Stephen, Jeffrey
>
> On 21 October 2015 at 05:05, Stephen Smalley <stephen.smal...@gmail.com>
> wrote:
>
>> Are you using the initramfs contents as your rootfs,
>
> We are using the initramfs as rootfs.
>
> And our kernel is based on the 3.18 version, and does not applied the
> patch here:
> https://android-review.googlesource.com/#/c/58360/
>
> Should we apply this patch to our kernel?
>
> Thanks,
> Yongqin Liu
>
>
>> or pivoting to an
>> ext4 root filesystem image that you built?
>>
>> On Tue, Oct 20, 2015 at 10:59 AM, YongQin Liu <yongqin....@linaro.org>
>> wrote:
>> > Hi, All
>> >
>> > When I tried the Marshmallow version on our platforms, I got following
>> > warnings:
>> > avc: denied { mounton } for pid=1 comm="init" path="/cache" dev="rootfs"
>> > ino=73 scontext=u:r:init:s0 tcontext=u:object_r:cache_file:s0 tclass=dir
>> > permissive=1
>> > avc: denied { mounton } for pid=1 comm="init" path="/storage"
>> dev="rootfs"
>> > ino=73 scontext=u:r:init:s0 tcontext=u:object_r:storage_file:s0
>> tclass=dir
>> > permissive=1
>> >
>> > To remove this warnings, I need to add following rules into the init.te
>> > file:
>> > allow init cache_file:dir mounton;
>> > allow init storage_file:dir mounton;
>> >
>> > but I did not see similar rules added into the init.te file for Nexus9
>> > build(device/htc/flounder/sepolicy/),
>> > and there is no such warnings on the Nexus9 build too.
>> >
>> > I am confused on why Nexus9 does not need the mounton rules for init
>> domain,
>> > and does not have the warnings.
>> >
>> > Anyone here can help to explain for me or point me where I should check?
>> >
>> > Thanks in advance!
>> > --
>> > Best Regards,
>> > Yongqin Liu
>> > ---------------------------------------------------------------
>> > #mailing list
>> > linaro-andr...@lists.linaro.org
>> > http://lists.linaro.org/mailman/listinfo/linaro-android
>> >
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>
>
>
> --
> Best Regards,
> Yongqin Liu
> ---------------------------------------------------------------
> #mailing list
> linaro-andr...@lists.linaro.org <linaro-...@lists.linaro.org>
> http://lists.linaro.org/mailman/listinfo/linaro-android
>
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