David Kastrup wrote:
On the newest Fedora Core tests, the setarch i386 workaround is no longer sufficient for dumping.
It turns out that one way to fix this is to use
echo 0 >/proc/sys/kernel/randomize_va_space
(which only root can do).
Uh oh.
Hmm, there is not much documentation of this, but what I can find is that this is a general feature in the Linux kernel from 2.6.11 or 2.6.12-rc1, so other GNU/Linux distributions may also have it. Apparently it also breaks dosemu.
The error message is
Dumping under names emacs and emacs-22.0.50
**************************************************
Warning: Your system has a gap between BSS and the
heap (6716260 byte). This usually means that exec-shield
or something similar is in effect. The dump may
fail because of this. See the section about exec-shield in etc/PROBLEMS for more information.
**************************************************
make[1]: *** [bootstrap-emacs] Segmentation fault
make[1]: Leaving directory `/usr/local/tmp/emacs-build/src'
make: *** [bootstrap-build] Error 2
It seems like we are playing catchup with the operating system's
security games.
Indeed. The final solution must be to either fix unexec (ELF I presume) or move away from unexec to something else. I think the only thing we can do for now is to note this in etc/PROBLEMS. It is too bad that root access is required on those systems to build Emacs.
Jan D.
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