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Don't use bgw_main even to specify in-core bgworker entrypoints.

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On EXEC_BACKEND builds, this can fail if ASLR is in use.

Backpatch to 9.5.  On master, completely remove the bgw_main field
completely, since there is no situation in which it is safe for an
EXEC_BACKEND build.  On 9.6 and 9.5, leave the field intact to avoid
breaking things for third-party code that doesn't care about working
under EXEC_BACKEND.  Prior to 9.5, there are no in-core bgworker
entrypoints.

Petr Jelinek, reviewed by me.

Discussion: http://postgr.es/m/09d8ad33-4287-a09b-a77f-77f8761adb5e@2ndquadrant.com
This commit is contained in:
Robert Haas
2017-03-31 20:35:51 -04:00
parent c281cd5fe1
commit 2113ac4cbb
8 changed files with 75 additions and 66 deletions
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2
src/include/access/parallel.h
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@ -67,4 +67,6 @@ extern void AtEOXact_Parallel(bool isCommit);
extern void AtEOSubXact_Parallel(bool isCommit, SubTransactionId mySubId);
extern void ParallelWorkerReportLastRecEnd(XLogRecPtr last_xlog_end);
extern void ParallelWorkerMain(Datum main_arg);
#endif /* PARALLEL_H */