Adam Borowski kilobyte at angband.pl
Sat Mar 31 02:54:51 AEDT 2018

On Fri, Mar 30, 2018 at 12:58:02PM +0200, Ingo Molnar wrote:
> * John Paul Adrian Glaubitz <glaubitz at physik.fu-berlin.de> wrote:
> > On 03/27/2018 12:40 PM, Linus Torvalds wrote:
> > > On Mon, Mar 26, 2018 at 4:37 PM, John Paul Adrian Glaubitz
> > > <glaubitz at physik.fu-berlin.de> wrote:
> > >>
> > >> What about a tarball with a minimal Debian x32 chroot? Then you can
> > >> install interesting packages you would like to test yourself.

> Here's the direct download link:
>   $ wget https://people.debian.org/~glaubitz/chroots/debian-x32-unstable.tar.gz

> Seems to work fine here (on a distro kernel) even if I extract all the files as a 
> non-root user and do:
>   ~/s/debian-x32-unstable> fakechroot /usr/sbin/chroot . /usr/bin/dpkg -l  | tail -2
>   ERROR: ld.so: object 'libfakechroot.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
>   ii  util-linux:x32         2.31.1-0.5           x32          miscellaneous system utilities
>   ii  zlib1g:x32             1:1.2.8.dfsg-5       x32          compression library - runtime

> So that 'dpkg' instance appears to be running inside the chroot environment and is 
> listing x32 installed packages.

> Although I did get this warning:
>   ERROR: ld.so: object 'libfakechroot.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
> Even with that warning, is still still a sufficiently complex test of x32 syscall 
> code paths?

Instead of mucking with fakechroot which would require installing its :x32
part inside the guest, or running the test as root, what about using any
random static binary?  For example, a shell like sash or bash-static would
have a decentish syscall coverage even by itself.

I've extracted sash from
and placed at https://angband.pl/tmp/sash.x32

$ sha256sum sash.x32 
de24097c859b313fa422af742b648c9d731de6b33b98cb995658d1da16398456  sash.x32

Obviously, you can compile a static binary that uses whatever syscalls you
want.  Without a native chroot, you can "gcc -mx32" although you'd need some
kind of libc unless your program is stand-alone.

It might be worth mentioning my "arch-test:
Because of many toolchain pieces it needs, you want a prebuilt copy:
-- while it has _extremely_ small coverage of syscalls (just write() and
_exit(), enough to check endianness and pointer width), concentrating on
instruction set inadequacies (broken SWP on arm, POWER7 vs POWER8, powerpc
vs powerpcspe, etc), it provides minimal test binaries for a wide range of

⣾⠁⢰⠒⠀⣿⡁ I was born a dumb, ugly and work-loving kid, then I got swapped on
⢿⡄⠘⠷⠚⠋⠀ the maternity ward.
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