Can access root file system, even as root user

[BillyMorgan]

As of 7.3.29-fpm I don't seem to be able to access the root file system.

docker run --rm -it php:7.3.29-fpm bash
root@07d226875503:/var/www/html# ls /
ls: cannot access '/': Operation not permitted

I can't see any existing issue tickets logged and 7.3.29-fpm was released ~1 month ago, so I imagine it's just me doing something stoopid. I'm just not sure what. As you can see the steps to reproduce are fairly simple 🤷

[wglambert]

docker-library/openjdk#465

you'll need to update Docker, runc, and likely libseccomp on your host.

[tianon]

See also #1192.