[[!meta copyright="Copyright © 2013 Free Software Foundation, Inc."]] [[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable id="license" text="Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled [[GNU Free Documentation License|/fdl]]."]]"""]] . # IRC, freenode, #hurd, 2013-07-02 in any case, what I wanted to check is if current hurd support PIE I just saw samuel posted some fixes to have PIE working in hurd are those included in the official image? sure it's just a trivial fixup in some address calculation code youpi: nice and does anyone know how complex would it be to implement some hackish support to have non-overlapping virtual addresses for applications supporting PIE? not too difficult really? I didn't expect such an answer XD I'd like to have something similar to a SASOS (single address space os) ? you mean an sasos on top of mach ? yes, but only for a few apps I want to evaluate i see the optimal would be to have all of hurd's servers on that mode you'l probably need to implement a small allocator but other than that it shouldn't be too hard, yes uh ?? but running on 32 bits can be a problem here and not hurdish at all what's not hurdish? we do want address space separation well, you can have multiple address spaces (page tables), but without overlapping addresses between them that's exactly what I'm looking for sorry i don't see what you mean if you run several servers in the same address space, they can corrupt each other we don't want that it's that simple yes, sorry, I didn't explain myself I want a separate address space on each server but I want all memory allocations to be on addresses unique to the whole OS that still doesn't make sense well, it will still be secure but I know it does not make sense per se I want to do some experiments with a simulator why do you want them non overlapping if they're separate ? well, in my simulator I wouldn't need to change the page tables, protection is provided through other means segmentation ? that's one possibility (small address spaces) what do you have in mind ? it wouldn't be on top of mach anyway then mach implements paging what I'm simulating is something of the likes of Mondriaan (http://www.cs.utexas.edu/~witchel/pubs/mmp-asplos2002.pdf) paging is ok for me 19:06 < xscript> well, in my simulator I wouldn't need to change the page tables, protection is provided through other means it didn't sound so I meant switching page tables (cr3, etc) mach does that I know, I know, I can just ignore that part for the moment ok for now, I'd like to morph hurd into a SASOS using one page table per process I just wanted to know how hard that would be, without starting with a full dive into the code there are other options (OSes, microkernels), but none of them provides as many readily-available applications as hurd I suppose MINIX would also be easy to modify, but there's less apps there, and I also would like to tamper with MIG I just wonder how hard it would be to modify MIG