
DragonFlyBSD has already pushed Meltdown fixes and Spectre mitigation while their latest security work on this BSD operating system is a new security.ptr_restrict sysctl option.
When enabled, security.ptr_restrict is another small safeguard that aims to prevent leaking kernel addresses back to user-space. That's the jist of it outlined via this commit hitting the DragonFly tree today.
This new sysctl will be in the upcoming DragonFlyBSD 5.2 release.
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