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Hackers Get Linux Running On a PlayStation 4 (engadget.com)
An anonymous reader writes: Two years after the PlayStation 4 was released, and two weeks after it was jailbroken, a group of hackers has now successfully installed Linux on it. "...it appears that the fail0verflow team utilized a WebKit bug similar to the one recently documented by GitHub user CTurt and then took things up a notch. CTurt's workaround focuses on the PlayStation 4's Webkit browser, which is tricked into freeing processes from the core of the console's operating system by an improvised webpage. The PS4 is powered by Sony's Orbis OS, which is based on a Unix-like software called FreeBSD. With a route into the console's system, fail0verflow then identified weaknesses in the PlayStation 4's GPU. It specifically called out engineers from semiconductor company Marvell, accusing them of 'smoking some real good stuff' when they designed the PlayStation 4's southbridge chip."
Linux is "Unix-like". It was made to be similar to Unix in behavior, but be based on different underlying code.
FreeBSD is literally Unix (descended from the "Berkely Software Distribution" of Unix). It's not the only version of Unix, but it's more Unix in origin than say, Ubuntu or Redhat are Linux in origin, as they also inherit significant parts of their origins from GNU utilities. No one with any comprehension of their history would call them "Linux-like", though.
As I've said elsewhere, the jailbreak is the accomplishment.
The party of stupid and the party of evil get together and do something both stupid and evil, then call it bipartisan.
FreeBSD comes with compatibility for running Linux executables, but it doesn't let you run the Linux kernel unless you run it in a VM, which doesn't seem to be the case here judging from the boot logging. Getting the Linux kernel to run on the bare hardware means adding drivers to run on the PS4 hardware, which is PC-like but not exactly a PC, and I doubt Sony published their FreeBSD hardware drivers. Doing that in just 2 weeks time is pretty impressive in my opinion.