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Um, are you sure you know what you are talking about? Chroot kits? Is this a real term? If so, please explain to me what it means. Do you mean rootkits? Do you know what chroot is? Chroot is a boon to security, not a vulnerability.
Slackware can be patched with selinux and grsecurity just as fine as Gentoo can. It just isn't done automatically and blindly. You can patch packages from source just fine with slackware.