Incorrect Permissions Installing Global Packages

[carloabelli]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When installing a global package, the symlinks are created from /usr/local/bin to /root/.config/yarn/node_packages/... however the permissions are incorrect and attempting to run the commands results in permission denied.

If the current behavior is a bug, please provide the steps to reproduce.
Install a package e.g. create-react-app:

$ sudo yarn global add create-react-app
$ create-react-app
permission denied: create-react-app

What is the expected behavior?
That create-react-app runs and does not have a permissions error.

Please mention your node.js, yarn and operating system version.

$ node --version
v8.4.0
$ yarn --version
1.0.1
$ uname -a
Linux arch 4.13.0-1-hardened #1 SMP PREEMPT Sun Sep 3 22:23:13 EDT 2017 x86_64 GNU/Linux

Other notes
Strangely this error does not happen to me when uninstalling and reinstalling http-server, though perhaps that is because I installed it before some change in how yarn handles permissions.

[Ghoughpteighbteau]

Hit this as well, but I think this is a duplicate? #1060