On 03/07/2014 06:03 AM, Tom Lane wrote:

In the bug thread I proposed making atexit_callback check whether getpid()
still matches MyProcPid.  If it doesn't, then presumably we inherited the
atexit callback list, along with the value of MyProcPid, from some parent
backend process whose elbow we should not joggle.  Can anyone see a flaw
in that?

There's the PID reuse problem. Forking twice (with a delay) could end up with the same PID as MyProcPid. Comparing the process start time would protect against that. Checking getppid() would have the same theoretical problem.

Florian Weimer / Red Hat Product Security Team

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