Horton

Re: Worth using personality(ADDR_NO_RANDOMIZE) for EXEC_BACKEND on linux?

Thomas Munro <thomas.munro@gmail.com>

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From: Thomas Munro <thomas.munro@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Andrew Dunstan <andrew@dunslane.net>, PostgreSQL Development <pgsql-hackers@postgresql.org>
Date: 2021-08-13T00:06:19Z
Lists: pgsql-hackers 
On Fri, Aug 13, 2021 at 9:59 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Hmm, ok.  Small thought: it might be better to put the #if inside
> the "else { .... }".  That way it scales easily to allow other
> platform-specific defaults if we find anything useful.  As-is,
> the obvious extension would end up with multiple else-blocks,
> which seems likely to confuse pgindent if nothing else.

True.  Thanks.  Pushed to all live branches.

Obviously the address may have to be adjusted if Apple moves stuff
around, or if the initial layout and ASLR slide range turn out to be
less constrained than I inferred by nosing around the source code and
testing on a couple of systems.

Commits

  1. Make EXEC_BACKEND more convenient on Linux and FreeBSD.

  2. Make EXEC_BACKEND more convenient on macOS.