Messages in this thread | | | Date | Tue, 11 Aug 1998 19:23:10 +0200 | From | Erik Corry <> | Subject | Re: Compiler alternatives to no-exec (was Re: non exec stack...) |
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In article <19980811184156.49153@lucifer.guardian.no> Alexander wrote: > On Fri, Aug 07, 1998 at 06:20:07AM +0000, Linus Torvalds wrote: >> >> There's an even simpler fix, with the compiler just pushing 0 on entry >> to all functions, and on exit it pops it off and aborts if it is >> non-zero.
> I have a preliminary implementation of this for egcs 1.03a. I tested > the overhead on gzip - it looks pretty good. I use the following > pattern which ensures that the branch is predicted non-taken:
Are you aware of Stackguard. They have a modified gcc that does more or less this, and are in the process of building a version of Red Hat 5.1 that uses it. It was already mentioned here:
http://www.cse.ogi.edu/DISC/projects/immunix/StackGuard/
-- Erik Corry
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