Hi Andy, On Fri, Sep 19, 2014 at 12:27 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > I have this (special mapping tracking) 3/4 implemented. I'm planning > on making it fully functional for 64-bit programs and almost correct > for 32-bit. (You'll still crash if you have multiple threads, you use > sysenter, and you remap the vdso, but I think that this is essentially > unavoidable until someone lets mremap work on multiple vmas at once.) In case that's useful, I was looking at swapping the vvar page by changing the vm_special_mapping to change the pages array between the actual vvar page and the zero page and using zap_page_range to force the next access to go through a page fault that would remap it. I didn't have all the details figured out (I was closer to 1/4 of it implemented) but I didn't see any issues on 32-bit programs. Let me know if you'd like to see some of my patches or if you think I should keep working on them. Cheers, Filipe -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
