Proot static + umeq crashes dies on bash

[necrose99]

Gentoo January 2017 arm64 , stage3.

Proot native, also fails.

[mickael-guene]

Can you describe how to reproduce.

[necrose99]

http://gentoo.osuosl.org/experimental/arm64/
http://gentoo.osuosl.org/experimental/arm64/stage3-arm64-20161219.tar.bz2
[ ] stage3-arm64-20161219.tar.bz2 2017-01-24 19:56 292M
[ ] stage3-arm64-20161219.tar.bz2.CONTENTS 2017-01-24 19:56 6.9M
[ ] stage3-arm64-20161219.tar.bz2.DIGESTS 2017-01-24 19:56 720

http://i.imgur.com/2ffs83M.png prior. it worked allthough slow as .... but worked in virtualbox. inside proot and umeq...
http://pastebin.com/FAzQAJ5T
was on the road , windows drive was new....
Linux drive @ bought the farm :-(

of late after alien bin-fmt misc , on fresh Sabayon Install (Gentoo Binary Distro) , (Rebuild qemu locally , for arm64 might work better ? ) tried sys-apps/proot , same string as in pastebin , essentially ...
then local , Suck-fest both die..
unfortunately I lost the logs , however I tried both , 9999(git) and stable proot , as well as yours..

both suffer from similar errors , however 4.8 kernel or higher , i'm told from docker may yield better results. i can try to reproduce errors

https://github.com/necrose99/Docker-Gentoo-ARM64/
some are commented out. as bash fails to fire up in the arm64.... ..
so easier to get the rootfs to unpack , be somewhat usable if they have arm64.
however getting both to work could make for far more easier tinkering...

anyhow , i'm just a meddlesome security researcher , , and docker would be quite useful for testing and less poor QA .. on my part , but it can also be a pest.

any tips or fixes would be useful.

[mickael-guene]

Can you try with PROOT_NO_SECCOMP environment variable define. On my side I need this so I can use proot.

[necrose99]

https://bugs.gentoo.org/buglist.cgi?quicksearch=PROOT_NO_SECCOMP
https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-apps/proot
emerge proot or on sabayon equo i proot , (sabayon basicly gentoo with polished bin repo and bin-pm ,
gentoo tools still under the hood. )

as for you local version it gives much the same , used binary in the chroot.

may need a local "vanilla-erish" Kernel - grsecurity ... and pax for the moment.

proot (gentoo system dies) as well as yours, with sig 11 , segfault.

qemu also , i'll try for gdb if I can , , and ./proot ./umeq

[necrose99]

core.zip dumps
./proot -R /opt/gentoo-arm64/ -q ./umeq /bin/bash
proot info: pid 19491: terminated with signal 11

proot -R /opt/gentoo-arm64/ -q ./umeq /bin/bash (try system)
proot info: pid 19482: terminated with signal 11

local system chroot location hmmm.?
proot -R /opt/gentoo-arm64/ -q qemu /bin/bash
proot error: 'qemu' not found (root = (null), cwd = /opt/gentoo-arm64, $PATH=/sbin:/bin:/usr/sbin:/usr/bin)
fatal error: see proot --help.

[mickael-guene]

I was unable to use your core files.
Can you run proot with -v 5 option ?

[necrose99]

/*

• parazyd - (c) wtfpl 2016
• pass arguments to qemu binary
  */

#include <string.h>
#include <unistd.h>

int main(int argc, char **argv, char **envp) {
char *newargv[argc + 3];

newargv[0] = argv[0];
newargv[1] = "-cpu";
newargv[2] = "cortex-a8"; /* here you can set the cpu you are building for */

memcpy(&newargv[3], &argv[1], sizeof(*argv) * (argc -1));
newargv[argc + 2] = NULL;
return execve("/emua-arm64", newargv, envp);

}

proot crashes even as system might be easier to do chroot via docker alpine.. ,