You may have noticed a recent spike in PS4 homebrew news lately. Firstly Fail0verflow revealed that they had successfully ported Linux to the PS4, however they stated that they would do nothing to facilitate piracy, so they would not be reversing Sony native files and would instead be focusing on making drivers.
Another hacker has picked up the gauntlet and using the same webkit browser exploit for Sony's 1.76 system firmware has created and released an ELF loader which runs 64-bit Elf files in-process on Linux, FreeBSD and the PS4 own system.
The ps4dev GitHub page has downloads and instructions for using the Elf Loader and the library of other tools such as the libps4 library that allows the interaction with Libc, POSIX, and SCE modules through the console's browser.
Here is a full list of the tools and descriptions:
Runs 64-bit Elf files in-process on Linux, FreeBSD and the PS4
Examples and proof of concepts which show something realized with libps4 (not necessarily unique to the PS4 - in fact prove of POSIX parts or failures are quite welcome)
Imported by libps4-generator to generate libps4
Generates libps4 through std (C and Posix) and SCE module headers
Libc, POSIX and SCE module library for the PS4
Reverse engineered community maintained SCE headers. Imported by libps4-generator to generate libps4
Most recent PS4 symbols by firmware for analysis and convenience
Read-only freebsd libc and POSIX headers. Imported by libps4-generator to generate libps4
This is all one step closer to game piracy and homebrew being possible on the PS4 console. The only major drawback right now is that the webkit exploit used is only possible on PS4 consoles running old firmware version 1.76
Fail0verflow have already stated that it is possible to exploit later kernel versions. Although Fail0verflow do not wish to facilitate game piracy on the PS4, if they can exploit later firmware versions, then its possible that others can also.