Re: [PATCH 0/3] exec: Make do_coredump more robust and safer whenusing pipes in core_pattern (v5)

[Neil Horman]

Ok, version 5 of this patchset.  The frist two patches are identical.  The
second two have some minor cleanups

Change notes:

1) Patch 3 has the wait_for_dump_helper modified a bit to remove the ISFIFO
check.  Instead, we use the ispipe test in do_coredump.

2) wait_for_dump_helpers is modified slightly to move the readers/writers
modification outside of the while loop, so we don't have to constantly churn
those values.

3) Augment the test to call wait_for_dump_helpers to include a non-zero check on
core_pipe_limit.  This restores the documented sysctl behavior that I intended,
which only allows for waiting on processes when core_pipe_limit is non-zero.

Patches Follow
Neil

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