This message was on the dosemu-devel list regarding this problem. Looks like it's an upstream fix.
----- Forwarded message from Reinhard Karcher <rkarc...@frey.de> -----
From: Reinhard Karcher <rkarc...@frey.de>
Date: Mon, 12 May 2008 15:27:54 +0200
Subject: Re: [Dosemu-devel] ubuntu update breaks mapping in dosemu 1.4
To: dosemu-de...@lists.sourceforge.net
User-Agent: Mozilla-Thunderbird 2.0.0.14 (X11/20080509)
Eric Auer wrote:
> - dosemu always fails with "LOWRAM mmap: Invalid argument" and
> a segmentation fault, no matter which maps style I use and no
> matter whether I have /tmp exec,suid or noexec,nosuid
This problem was solved in the latest dosemu svn. I attach the diff, as
it is small.
Reinhard
--- src/base/init/init.c (Revision 1862)
+++ src/base/init/init.c (Revision 1863)
@@ -262,10 +262,18 @@
if (result != NULL)
{
+ int err = errno;
perror ("LOWRAM mmap");
- config.exitearly = 1;
+ if (err == EINVAL) {
+ fprintf(stderr, "Cannot map low DOS memory (the first 640k).\n"
+ "You can most likely avoid this problem by running\n"
+ "sysctl -w vm.mmap_min_addr=0\n"
+ "as root, or by changing the vm.mmap_min_addr setting in\n"
+ "/etc/sysctl.conf to 0.\n");
}
+ leavedos(99);
}
+}
/*
* DANG_BEGIN_FUNCTION version_init
-------------------------------------------------------------------------
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--
Ryan C. Underwood, <neme...@icequake.net>
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