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From: Wolfgang Walther <walther@technowledgy.de>
To: Christophe Pettus <xof@thebuild.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: PostgreSQL Bugs <pgsql-bugs@lists.postgresql.org>
Subject: Re: Regression tests fail with musl libc because libpq.so can't be loaded
Date: Sun, 17 Mar 2024 14:11:19 +0100
Message-ID: <855a1b16-0dc0-42b2-8f90-79eb49cf2893@technowledgy.de> (raw)
In-Reply-To: <68C88EE3-CDCB-4993-9173-3A773F491F3A@thebuild.com>
References: <fddd1cd6-dc16-40a2-9eb5-d7fef2101488@technowledgy.de>
	<2852940.1710599083@sss.pgh.pa.us>
	<443da167-ee01-47d2-9c83-105694b4cbd5@technowledgy.de>
	<CA+hUKGJhp0opkCybdOrbQSMyHX8cRuLh2ygkqtivizCqK6kfOA@mail.gmail.com>
	<CA+hUKGL=CE7Gg5p7ijbtEWhnPR-Ua4gemhuz-kQpSy3dD1+SYQ@mail.gmail.com>
	<ef1b47df-0808-4bd7-b08c-5153d5d75f4c@technowledgy.de>
	<68C88EE3-CDCB-4993-9173-3A773F491F3A@thebuild.com>

Christophe Pettus:
> Given the musl (still?) does not define a preprocessor macro specific to it, is there a way of improving the test in pg_status.c to catch this case?  It seems wrong that the current test passes a case that doesn't actually work.

The missing macro is on purpose and unlikely to change: 
https://openwall.com/lists/musl/2013/03/29/13

I also found this thread, which discusses exactly our case: 
https://www.openwall.com/lists/musl/2022/08/17/1

Some quotes from that thread:

> I understand that what Postgres et al are doing is a nasty hack.

And:

> Applications that *really* want setproctitle type functionality can
> presumably do something like re-exec themselves with a suitably large
> argv[0] to give them safe space to overwrite with their preferred
> message, rather than UB trying to relocate the environment (and auxv?
> how? they can't tell libc they moved it) to some other location.

Could that be a more portable way of doing this?

Best,

Wolfgang





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