ibcs-us is a user space replacement fo th old ibcs kernel module that alloed
execution of SCO and other unix binaries

on RHEL 8 I am getting the below error when trying to execute a SCO coff binary?
it works ok on RHEL 7

[root@rhel80t21 bin]# ibcs-us /u/catcom/bin/csum.coff
<3>mm->brk does not lie within mmap/u/catcom/bin/csum.coff: Exec format error.


On sourceforge....
From: Russell Stuart
To: [ibcs-us:tickets]
Sent: Wednesday, January 06, 2021 9:21 PM
Subject: [ibcs-us:tickets] #5 error running SCO coff on RHEL8

At long last I've had a chance to have a look at this. An mmap() of a file to address 0 is returning EPERM on RHEL 8, whereas it succeeds on every other Linux if you are root, or have the executable has CAP_SYS_RAW_IO.

The next step is normally to look at the kernel source to see if its possible to work around this. (That's how I learnt ibcs-us needs CAP_SYS_RAW_IO). Failing that with the source you could even patch the kernel and recompile. However, in a change as of RHEL 8, RedHat doesn't appear to make the kernel source, or indeed any source (ie srpm) available to non-customers. Apparently customers can download the sources from https://access.redhat.com/

I am not a customer, so no source for me. Unless someone can get a me copy this is where this bug investigation stops.

I hadn't really considered it before, but this makes me realise when open source ceases to be completely open, it loses some of its usefulness.

[tickets:#5] error running SCO coff on RHEL8

Status: open
Milestone: 1.0
Created: Tue Aug 04, 2020 06:28 AM UTC by Rod Sheppard
Last Updated: Fri Nov 06, 2020 10:29 AM UTC
Owner: Russell Stuart

on RHEL 8 I am getting the below error when trying to execute a SCO coff binary?

[root@rhel80t21 bin]# ibcs-us /u/catcom/bin/csum.coff
<3>mm->brk does not lie within mmap/u/catcom/bin/csum.coff: Exec format error.