[Bug 153243] [ibcs2] Seg fault whne running COFF binary using iBCS2 in 8.1

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=153243

Kristoffer Eriksson <ske-89 at pkmab.se> changed:

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--- Comment #2 from Kristoffer Eriksson <ske-89 at pkmab.se> ---
This sounds to me like the same problem that was later solved in the following
discussion in 2013:
https://lists.freebsd.org/pipermail/freebsd-hackers/2013-October/043615.html

The solution was to run "sysctl security.bsd.map_at_zero=1” or add
“security.bsd.map_at_zero=1“ to /etc/sysctl.conf.

The problem was that COFF files want to load at address 0, which is no longer
allowed by default. The executable code ends up on the wrong address, and
crashes.

So it is not really a bug, just difficult to use.

There was some follow-up discussion that this setting is documented in aout(4),
but that some more documentation and clearer messages might be added for COFF 
(or iBCS2) too. Or make the COFF loader allow this automatically.

Most people would probably never find this out for themselves, and would just
conclude that iBCS2 is broken, so I think some of those suggestions should be
undertaken. It took me a long time to find this by googling too.

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