From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe De Muyter <phdm@macqel.be>
Subject: Re: [uClinux-dev] [PATCH] m68k: Merge mmu and non-mmu versions of
	sys_call_table
Date: Thu, 7 Apr 2011 10:35:19 +0200
Message-ID: <20110407083519.GA10282@frolo.macqel>
References: <alpine.DEB.2.00.1104062231190.11240@ayla.of.borg> <20110406220510.GA17350@frolo.macqel> <4D9D0AF3.9070100@snapgear.com> <000301cbf4c9$40339fc0$c09adf40$@com> <4D9D24BB.3060804@snapgear.com> <000d01cbf4d1$d50e2f90$7f2a8eb0$@com> <4D9D3A28.9060104@snapgear.com> <BANLkTi=ay0o=QH_cUffcC=HDm=2iLcFrog@mail.gmail.com> <m3zko2bh19.fsf@linux-m68k.org>
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To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>, Greg Ungerer <gerg@snapgear.com>, Gavin Lambert <gavinl@compacsort.com>, uClinux development list <uclinux-dev@uclinux.org>, Linux/m68k <linux-m68k@lists.linux-m68k.org>

On Thu, Apr 07, 2011 at 10:29:54AM +0200, Andreas Schwab wrote:
> Geert Uytterhoeven <geert@linux-m68k.org> writes:
> 
> > Isn't there a reason it was read-write on m68k, like the table may be changed
> > at runtime (to install rootkits :-)? Have to check what the other arches do...
> 
> Initially the syscall_table in Linux has always been writable, bb152f53
> ("x86/x86_64: mark rodata section read-only: make some datastructures
> const") made it read-only on x86.  Apparently nobody bothered to do the
> equivalent change on m68k (I don't think anything makes the kernel text
> segment write protected anyway).

Except, of course, ld config files who put text and rodata in ROM/FLASH for XIP
on embedded systems.

Philippe