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xen-devel
Re: [Xen-devel] stack protection in mini-os
Hello,
For stubdomains, what I did is to add a check for ESP relative to the
bottom of the stack in a frequently called function, (think about
something like errno_location())
Harald Roeck, le Thu 31 Jul 2008 13:58:36 -0700, a écrit :
> If we overflow the stack and run into the
> mapped out stack page xen crashes and the machine reboots.
Uh, that's bad! Which version of Xen is this with? That is a bug of Xen,
can you reproduce it with a RC of 3.3?
> it looks like xen is trying to push the arguments for the page fault
> trap onto the mapped out page.
Most probably yes, but it should catch the error.
> rbp: 000000000007b120 rsp: 000000000007aff0 r8: 0000000000000010
> ...
>
> fyi: the read only page in this setup was 0x7a000.
So that's coherent indeed, but I guess you'd like to have the backtrace.
> so my question: is it possible to set an "alternate" trap stack?
I don't think the hypervisor provides this for kernel level.
> or the failsafe_callback?
failsafe_callback is only called when you get a fault during the
execution of callback, not during normal flow.
Samuel
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