Alexey Serbin has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/19158 )

Change subject: [rpc] avoid crashes on malicious negotiation attempts
......................................................................

[rpc] avoid crashes on malicious negotiation attempts

This patch updates the code for RPC connection negotiation to change
from CHECK() to LOG(DFATAL) and Status::IllegalState() when checking on
some security constraint.  This narrows the attack vector of potential
DOS attacks for Kudu servers.

Change-Id: I416e3e952a3ee928ed6c51389227184c73a96b0b
Reviewed-on: http://gerrit.cloudera.org:8080/19158
Tested-by: Kudu Jenkins
Reviewed-by: Yuqi Du <[email protected]>
Reviewed-by: Yingchun Lai <[email protected]>
---
M src/kudu/rpc/client_negotiation.cc
M src/kudu/rpc/client_negotiation.h
M src/kudu/rpc/server_negotiation.cc
3 files changed, 31 insertions(+), 8 deletions(-)

Approvals:
  Kudu Jenkins: Verified
  Yuqi Du: Looks good to me, but someone else must approve
  Yingchun Lai: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I416e3e952a3ee928ed6c51389227184c73a96b0b
Gerrit-Change-Number: 19158
Gerrit-PatchSet: 2
Gerrit-Owner: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Attila Bukor <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Yingchun Lai <[email protected]>
Gerrit-Reviewer: Yuqi Du <[email protected]>

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