Messages in this thread | | | Date | Fri, 30 Aug 2002 01:22:33 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 1 / ...] i386 dynamic fixup/self modifying code |
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Hi!
> > > 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
Aha, making a list and just patching early at boot is even simpler than method I was thinking about.... Why not do it that way? Pavel -- Casualities in World Trade Center: ~3k dead inside the building, cryptography in U.S.A. and free speech in Czech Republic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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