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

[Henry Zhang]

Ondrej,

Thanks for your help!
I am using Yocto embedded to compile. The kernel config file is copied from
/proc/config.gz in my linux device.
The kernel function selinux_init() is not triggered when booting up.

---henry

On Tue, Aug 8, 2023 at 1:17 AM Ondrej Mosnacek  wrote:
> That is not a kernel config file. How are you building/installing the
> kernel? What Linux distribution (Fedora/CentOS/Ubuntu/...) is this on?
>
> On Mon, Aug 7, 2023 at 6:29 PM Henry Zhang  wrote:
> > 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
>
> wrote:
> > > On Sat, Aug 5, 2023 at 2:53 AM Henry Zhang
>
> 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.
>
> --
> Ondrej Mosnacek
> Senior Software Engineer, Linux Security - SELinux kernel
> Red Hat, Inc.