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unexec and fedora core 4

From: Camm Maguire
Subject: unexec and fedora core 4
Date: 08 Dec 2005 20:27:58 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Greetings!  I am a developer of GCL, which shares unexec with emacs.
I have noticed on certain recent Fedora Core 4 machines, binaries
produced with unexec cannot mprotect memory (allocated with brk)
PROT_EXEC (returning EACCESS, i.e. permission denied), whereas
binaries output by ld can do so just fine.  This does not vary with
exec-shield or randomize_va_space settings, and appears quite machine
specific.  The same binary which functions perfectly normally on one
fc4 machine shows this failure only on another machine.  I have as yet
been unable to correlate this with dynamic library placement, or other
settings in /proc/sys.

If this rings any bells with anyone, I'd be most appreciative for any

Take care,
Camm Maguire                                            address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

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