Trying to build L4 on NixOS

Mateusz Czaplinski czapkofan at gmail.com
Sat Mar 25 00:12:31 CET 2017


Hm; tried adding the following line:

  hardeningDisable = [ "stackprotector" "pic" ];

per https://github.com/NixOS/nixpkgs/issues/18895 and
https://github.com/NixOS/nixpkgs/issues/18995. This now seems to get me
through the bootstrap.elf linking phase! But it fails soon afterwards on
bootstrap32.elf :-( with:

  ld: skipping incompatible
/nix/store/...-gcc-5.4.0/lib/gcc/x86_64-unknown-linux-gnu/5.4.0/libgcc.a
when searching for -lgcc
  ld: cannot find -lgcc

Can I skip building bootstrap32.elf somehow? Or should I not?
Do I even have to build l4, or do I only need fiasco for l4linux? (fiasco
seems to build OK with the initial hardeningDisable = [ "all" ]; I tried.)
Or none at all, just the sources?

Thanks,
/Mateusz.



On Fri, Mar 24, 2017 at 10:06 PM, Mateusz Czaplinski <czapkofan at gmail.com>
wrote:

> I'm trying to build L4 on NixOS in a VM (long term goal: try to learn how
> to replace NixOS's kernel with L4Linux, then maybe Genode). I'm getting an
> error like below:
>
>   undefined reference to `__stack_chk_fail'
>
> during linking of bootstrap.elf - in a GCC's error-barf just after:
>
>   [bootstrap] ==> Linking bootstrap.elf
>
> I've put up the precise Nix expression/script I'm using to build it on
> github - at:
>   https://github.com/akavel/l4.nix/blob/0108dfcf8d84780e1ba884c41ece0d
> 2dbf4ddd84/l4re.nix
> but what it generally boils down to is a sequence of commands like this:
>
>   $ wget http://os.inf.tu-dresden.de/download/snapshots/l4re-core-
> 2016082114.tar.xz
>   $ tar xf l4re-core-2016082114 <(201)%20608-2114>.tar.xz
>   $ cd l4re-core-2016082114 <(201)%20608-2114>
>   $ mkdir out
>   $ cp src/l4/mk/defconfig/config.amd64 out/l4/.kconfig
>   $ make -C src/l4 O=out/l4 olddefconfig
>   $ make -C out/l4
>
> I've tried various additional changes, based on some snippets found here
> and there on teh Internets, like:
>   - adding V=0 to the last make (no idea what it does yet, just some cargo
> culting)
>   - adding NIX_CFLAGS_COMPILE = "-fno-stack-protector"; to the Nix
> expression/script (also not really sure where it applies in the stack);
> but none of the above helped.
>
> Any idea what I could try doing to push it further?
>
> Thanks,
> /Mateusz.
>
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