Messages in this thread | | | Subject | Re: [PATCH 1 / ...] i386 dynamic fixup/self modifying code | From | Alan Cox <> | Date | 30 Aug 2002 00:19:52 +0100 |
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On Wed, 2002-08-28 at 13:11, Pavel Machek wrote: > > Unfortunately with this patch executing invalid code will cause the > > processor to enter an infinite exception loop rather than panic. Fixing > > this is not trivial for SMP+preempt so it's not done at the moment. > > Using 0xcc for everything should fix that, right?
Except you can't do the fixup on SMP without risking hitting the CPU errata. You also break debugging tools that map kernel code pages r/o and people who ROM it.
The latter aren't a big problem (they can compile without runtime fixups). For the other fixups though you -have- to do them before you run the code. That isnt hard (eg sparc btfixup). You generate a list of the addresses in a segment, patch them all and let the init freeup blow the table away
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