Description: Process impersonation by stalling between start_time and pid allocation
References:
 https://bugs.chromium.org/p/project-zero/issues/detail?id=1692
 https://git.kernel.org/linus/7b55851367136b1efd84d98fea81ba57a98304cf
Notes:
Bugs:
upstream: released (5.0-rc2) [7b55851367136b1efd84d98fea81ba57a98304cf]
4.19-upstream-stable: released (4.19.15) [bc999b5099d70030a9cb1aff2c48b073f65e0f8f]
4.9-upstream-stable: released (4.9.150) [0ea6030b555803b9c565e0471c94648fe2a4bda7]
3.16-upstream-stable: released (3.16.67) [971081984266d7934b2f0253215e3f31f9337915]
sid: released (4.19.16-1)
4.9-stretch-security: released (4.9.161-1)
3.16-jessie-security: released (3.16.68-1)