Are there linux distros without selinux portion in kernel? Sorry if that's dumb question ;), but my distro (debian) has it and i see that it's in kernel on kernel.org so i was wondering if it's so popular that every distro has it or some delete this portion of kernel and use something else? If there are distros without this kernel part (and i mean totally deleted, not just disabled and waiting for being enabled on boot like in debian) could you give some examples?
If you are concerned about which modules and features are compiled into your kernel, you should maintain your own kernel, compiled by you. Debian has a system named make_kpkg to facilitate this process. You can copy over a stable config from /boot to the new kernel source tree and load that into your custom build so you don't have to configure everything from scratch. Then you have complete freedom to manually scan through every single kernel configuration setting, including SELinux.
while it is in the vanilla kernel i presume every distro ships the system with that part enabled.
You can only disable it or recompile your own kernel without it.
title SE-Linux Test System root (hd0,0) kernel /boot/vmlinuz-2.4.20-selinux-2003040709 ro root=/dev/hda1 nousb selinux=0 #initrd /boot/initrd-2.4.20-selinux-2003040709.img
SELinux ships with Debian, but it's disabled by default. There is a lot you need to do to enable it, so I wouldn't worry. The only reason it's there is because a lot of companies that use Debian on their servers require SELinux -- so Debian offers it as a choice, but doesn't force it on any of it's users.