“Huge Dirty COW” (CVE-2017–1000405) (medium.com)

This was already posted here 4 hours ago [0], but got (very likely auto)killed with no upvotes. Me vouching for it and upvoting it 4 hours later isn't going to do much to revive that submission, so I'm taking the liberty to repost.

[0] https://news.ycombinator.com/item?id=15820386