This can help you 
http://seandroid-list.tycho.nsa.narkive.com/rSP3VScv/policy-version-30-support

Check POLICYDB_VERSION_MAX is pointing to the right version in kernel.
Also check POLICYVERS (external/sepolicy/Android.mk or 
system/sepolicy/Android.mk) to point to the max value of  POLICYDB_VERSION_MAX

Thanks.

From: Seandroid-list [mailto:seandroid-list-boun...@tycho.nsa.gov] On Behalf Of 
Sameer Joshi
Sent: Monday, August 01, 2016 4:44 PM
To: seandroid-list@tycho.nsa.gov
Cc: Milan
Subject: Regarding enabling selinux on Android

Hi All,

We are trying to enable SELinux in kernel and have defined following options in 
the config file.

CONFIG_SECURITY_SELINUX=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y

Command line options for kernel have "selinux=1 security=selinux" set.

However during boot time, we get following error:


[    5.549941] SELinux:  policydb version 30 does not match my version range 
15-28

[    5.557486] init: SELinux:  Could not load policy:  Invalid argument

[    5.563990] init: failed to load policy: Invalid argument

[    5.569413] init: Security failure; rebooting into recovery mode...



Can someone help us what this error means? Any help in fixing this would be 
appreciated.



Regards,

Sameer Joshi

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