Cook: Colliding with the SHA prefix of Linux's initial Git commit

Kees Cook describes
his work resulting in a kernel documentation commit whose ID shares the
same first 12 characters as the initial commit in the kernel's repository.

This is not yet in the upstream Linux tree, for fear of breaking
countless other tools out in the wild. But it can serve as a test
commit for those that want to get this fixed ahead of any future
collisions (or this commit actually landing).

LWN looked at commit-ID collisions a few
weeks back.