Re: selinux_init() is not executed in booting in kernel 5.15

[Henry Zhang <henryzhang62@xxxxxxxxx>]

Ondrej,

Attached is my kernel configuration file.
~# cat /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=enforcing
# SELINUXTYPE= can take one of these values:
#     minimum - Minimum Security protection.
#     standard - Standard Security protection.
#     mls - Multi Level Security protection.
#     targeted - Targeted processes are protected.
#     mcs - Multi Category Security protection.
SELINUXTYPE=mcs

# sestatus
SELinux status:                 disabled

# getenforce
Disabled

# setenforce 1
setenforce: SELinux is disabled

# dmesg|grep SELi                                                                                                                                                                                        
[    5.604171] systemd[1]: Starting SELinux init for /dev service loading...

# dmesg|grep SELI
[    4.180494] systemd[1]: systemd 250.5+ running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA -SMACK +SECCOMP -GCRYPT -GNUTLS -OPENSSL +ACL +BLKID -CURL -ELFUTILS -FIDO2 -IDN2 -IDN -IPTC +KMOD -LIBCRYPTSETUP)

"SELInux: Initializing" is not seen in dmesg.

Please comment on what is missing?

On Sat, Aug 5, 2023 at 1:12 AM Ondrej Mosnacek <omosnace@xxxxxxxxxx> wrote:

On Sat, Aug 5, 2023 at 2:53 AM Henry Zhang <henryzhang62@xxxxxxxxx> wrote:
>
> Hi guys,
>
> I am porting selinux from kernel 4.14 to 5.15. Everything works fine in kernel 4.14.
> keep same /etc/selinux/conf and kernel parameters to enable SELinux.
>
> But the selinux_init() is not executed when kernel 5.15 boots because no "SELinux: Initializing" is seen in dmesg.
>
> This selinux_init() is defined in http://tomoyo.osdn.jp/cgi-bin/lxr/source/security/selinux/hooks.c
>
>  DEFINE_LSM(selinux) = {
> 7288         .name = "selinux",
> 7289         .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
> 7290         .enabled = &selinux_enabled_boot,
> 7291         .blobs = &selinux_blob_sizes,
> 7292         .init = selinux_init,
> 7293 };
>
> My question is why the selinux_init() is not called when kernel 5.15 boots up?

Hi Henry,

Can you share your kernel build config? If you don't know what it is
or how to get it, then the next question would be: How did you
obtain/build the kernel in question?

--
Ondrej Mosnacek
Senior Software Engineer, Linux Security - SELinux kernel
Red Hat, Inc.

Attachment: config
Description: Binary data

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