Messages in this thread | | | Date | Mon, 5 Mar 2007 13:39:40 +0100 | From | Andi Kleen <> | Subject | Re: Wanted: simple, safe x86 stack overflow detection |
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On Mon, Mar 05, 2007 at 02:18:24AM +0100, Arnd Bergmann wrote: > On Wednesday 28 February 2007, Chuck Ebbert wrote: > > Can we just put a canary in the threadinfo and check it on every > > task switch? What are the drawbacks? > > It's not completely reliable, in case of functions that allocate > far too much stack space. You might want to take a look at the > gcc support that Andreas Krebbel implemented for s390 to check > for stack overflows:
I hacked this up for x86-64 too at some point (using the gprof support). However it's quite slow.
Here's the old 2.4 patch:
ftp://ftp.x86-64.org/pub/linux/debug/stackcheck-1
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