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Subject[PATCH v2 0/4] seccomp: Add SECCOMP_FILTER_FLAG_KILL_PROCESS
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This series is the result of Fabricio and I going around a few times
on possible solutions for finding a way to enhance RET_KILL to kill
the process group. There's a lot of ways this could be done, but I
wanted something that felt cleanest. As it happens, Tyler's recent
patch series for logging improvement also needs to know a litte bit
more during filter runs, and the solution for both is to pass back
the matched filter. This lets us examine it here for RET_KILL and
in the future for logging changes.

The filter passing is patch 1, the new flag for RET_KILL is patch 2.
Some test refactoring is in patch 3 for the RET_DATA ordering, and
patch 4 is the test for the new RET_KILL flag.

Please take a look!

Thanks,

-Kees

v2:
- moved kill_process bool into struct padding gap (tyhicks)
- improved comments/docs in various places for clarify (tyhicks)
- use ASSERT_TRUE() for WIFEXITED and WIFSIGNALLED (tyhicks)
- adding Reviewed-bys from tyhicks

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