Linux 4.11 - broken enlightenment window manager (fixed in 4.12)

[Ralph Sennhauser]

Hi Greg,

With 4.11 the enlightenment window mangers fails to start setuid
children due to commit 64b875f7ac8a ("ptrace: Capture the ptracer's
creds not PT_PTRACE_CAP").

Commit c70d9d809fde ("ptrace: Properly initialize ptracer_cred on
fork") in Linus tree fixes the issue. Tested with v4.11.4. Please
consider cherry-picking.

Thanks
Ralph