Re: [Xen-devel] Xen with grsec?

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

Pasi Kärkkäinen wrote:
> Has anyone tried running grsec with xen (2.4) ?
>
> Are there any expected problems, or should it be ok "out-of-the-box"? 
> I have not yet tried patching xen-patched kernel with grsec.. Just wanted to
> ask if somebody has already tried this.
I am fairly sure you will run into infinite page-fault loops if you are 
trying to use the PaX 'software NX' implementation, because the call to 
Xen to update the page tables will frequently exhaust the associativity 
of the data-TLB.
You could find a way of implementing this part inside Xen though, by 
using an AVL or reserved bit to signify 'no execute', but this may be 
too much hassle.
The rest of grsec looks (from the description on the website) like it 
can be applied without problems.
Jacob


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