CVE-2018-10087 check

[msmeissn]

https://github.com/torvalds/linux/commit/dd83c161fbcc5d8be637ab159c0de015cbff5ba4

fixes this issue:

wait4(-2147483648, 0x20, 0, 0xdd0000) triggers: UBSAN: Undefined behaviour in kernel/exit.c:1651:9

It might not show up in normal kernels, but this condition should have a ltp test.

[richiejp]

https://patchwork.ozlabs.org/project/ltp/patch/[email protected]/

[richiejp]

can close @metan-ucw