Messages in this thread | | | Date | Tue, 6 Mar 2007 19:43:41 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: Wanted: simple, safe x86 stack overflow detection |
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On Tue, 6 Mar 2007, Chuck Ebbert wrote: > > In the 4k/4k stack i386 kernel, is there any fundamental reason it > can't be 4k/8k? We seem to be mostly hitting problems in overflowing > the IRQ stack... I think. Overhead would only be 4k per CPU for that.
For all of history prior to 2.6.20, there's been the fundamental reason that even interrupt stacks need to access current_thread_info, and that involved the (THREAD_SIZE - 1) mask. But 2.6.20's read_pda using %gs gets away from that: my guess is that it's now possible for i386 to use different sized stacks.
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