linux-kernel - [Regression?] "selinux: add a map permission check for mmap" causing AOSP to fail booting

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Date:   Wed, 5 Jul 2017 22:32:04 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Stephen Smalley <sds@...ho.nsa.gov>,
        Paul Moore <paul@...l-moore.com>
Cc:     Jeffrey Vander Stoep <jeffv@...gle.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Nick Kralevich <nnk@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Dmitry Shmidt <dimitrysh@...gle.com>
Subject: [Regression?] "selinux: add a map permission check for mmap" causing
 AOSP to fail booting

Hey folks,
   I updated my HiKey kernel tree to linus/master today and it stopped
booting (hitting errors at init and reseting immediately into
bootloader mode):

[    5.289827] init: Skipped setting INIT_AVB_VERSION (not in recovery mode)
[    5.296709] init: Loading SELinux policy
[    5.334521] SELinux:  Permission validate_trans in class security
not defined in policy.
[    5.342828] SELinux:  Permission map in class file not defined in policy.
[    5.349690] SELinux:  Permission map in class dir not defined in policy.
[    5.356464] SELinux:  Permission map in class lnk_file not defined in policy.
[    5.363666] SELinux:  Permission map in class chr_file not defined in policy.
[    5.370870] SELinux:  Permission map in class blk_file not defined in policy.
[    5.378070] SELinux:  Permission map in class sock_file not defined
in policy.
[    5.385351] SELinux:  Permission map in class fifo_file not defined
in policy.
[    5.392647] SELinux:  Permission map in class socket not defined in policy.
[    5.399670] SELinux:  Permission map in class tcp_socket not
defined in policy.
[    5.407042] SELinux:  Permission map in class udp_socket not
defined in policy.
[    5.414415] SELinux:  Permission map in class rawip_socket not
defined in policy.
[    5.421969] SELinux:  Permission map in class netlink_socket not
defined in policy.
...
[    5.850590] SELinux: the above unknown classes and permissions will be denied
[    5.892283] audit: type=1403 audit(104.182:2): policy loaded
auid=4294967295 ses=4294967295
[    5.892510] selinux: SELinux: Loaded policy from /sepolicy
[    5.892510]
[    5.907690] audit: type=1404 audit(104.183:3): enforcing=1
old_enforcing=0 auid=4294967295 ses=4294967295
[    5.911853] selinux: selinux_android_file_context: Error getting
file context handle (Permission denied)
[    5.911853]
[    5.911968] init: execv("/init") failed: Permission denied
[    5.911987] init: Security failure...
[    5.912008] init: panic: rebooting to bootloader
[    5.912034] init: Reboot start, reason: reboot, rebootTarget: bootloader

I bisected the issue down to 3ba4bf5f1e2c (selinux: add a map
permission check for mmap).

It seems every -rc1 I hit something like this w/ selinux, and
sometimes it is just that I need to fix my sepolicy files, but I'm not
really sure which this one is.

Reverting the identified commit allows things to boot normally.

Ideas?

thanks
-john