Horton

Re: Postmaster self-deadlock due to PLT linkage resolution

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@lists.postgresql.org
Date: 2022-08-30T17:41:16Z
Lists: pgsql-hackers 
Hi,

On 2022-08-30 13:24:39 -0400, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > Perhaps it'd be saner to default to building with -Wl,-z,now? That should fix
> > the problem too, right (and if we combine it with relro, it'd be a security
> > improvement to boot).
> 
> Hm.  Not sure if that works on NetBSD, but I'll check it out.

FWIW, it's a decently (well over 10 years) old thing I think. And it's documented in
the netbsd ld manpage and their packaging guide (albeit indirectly, with their
tooling doing the work of specifying the flags):
https://www.netbsd.org/docs/pkgsrc/hardening.html#hardening.audit.relrofull

Greetings,

Andres Freund

Commits

  1. Use WaitEventSet API for postmaster's event loop.

  2. On NetBSD, force dynamic symbol resolution at postmaster start.