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From Ma Hongxu <inte...@outlook.com>
Subject Thinking of how to fix HAWQ-1381
Date Wed, 08 Mar 2017 02:29:30 GMT
Hi all
I found a hawq core dump issue: https://issues.apache.org/jira/browse/HAWQ-1381

buffer overflow here: src/backend/access/external/fileam.c:2610
sprintf(extvar->GP_SEGMENT_ID, "%d", GetQEIndex());

GetQEIndex() return -10000 on master and GP_SEGMENT_ID is char[6], no more space for '\0',
so it happend.

There are two ways to fix it:

  1.  enlarge GP_SEGMENT_ID buffer, from char[6] to char[7]
  2.  return other short interger instead of -10000 on master

I think 1 is more straight, but have some risks (some callers assume the buffer size).
And 2 also seems it's a magic number, may influence many places.

Any suggestions? Thanks!

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