GNU bug report logs - #50151
Coreutils, aarch64 and chroot

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Message #30 received at 50151 <at> debbugs.gnu.org (full text, mbox):

From: Frans de Boer <frans <at> fransdb.nl>
To: Assaf Gordon <assafgordon <at> gmail.com>
Cc: Paul Eggert <eggert <at> cs.ucla.edu>, 50151 <at> debbugs.gnu.org
Subject: Re: bug#50151: Coreutils, aarch64 and chroot
Date: Thu, 26 Aug 2021 10:00:26 +0200

On 8/26/21 01:25, Assaf Gordon wrote:
> tag 50151 notabug
> close 50151
> stop
>
> On 2021-08-25 12:54 p.m., Frans de Boer wrote:
>> On 8/25/21 10:16 AM, Assaf Gordon wrote:
>>>   qemu-aarch64 -strace -L /newroot \
>>>       /newroot/usr/sbin/chroot /newroot /usr/bin/env --version 2&1 \
>>>           | tee log.txt
>>>
>> @assaf: your suggestions no. 1 and 2, had the predicted results. 
>> Thus, suggestion no. 3 failed because of suggestion no.2. I followed 
>> then suggestion 4 and attached the strace output to this message. It 
>> seems that chroot is working as expected, only env seems to fail with 
>> an error.
>
> Not exactly:
> The 'chroot' system-call *seems* to succeed,
> followed by a failed "execve(2)" system call to execute another binary.
> That "execve" system fails - so it is not 'env' per-se,
> it is any program that will try to execute another aarch64 binary.
>
> Learning that, searching for "qemu-user", "chroot" and "architecture"
> leads to several web pages detailing similar errors (and few suggested
> solutions):
>
> https://wiki.gentoo.org/wiki/Crossdev_qemu-static-user-chroot
>
> https://newbedev.com/how-can-i-chroot-into-a-filesystem-with-a-different-architechture 
>
>
> https://ownyourbits.com/2018/06/13/transparently-running-binaries-from-any-architecture-in-linux-with-qemu-and-binfmt_misc/ 
>
>
>> I hope you have some clue of what is going wrong.
>
> With the above information, we can conclude this is not a bug
> in coreutils - it is a limitation of the linux+qemu-user setup.
>
> So I'm closing this item and marking it as "not a bug",
> but discussion can continue by replying to this thread.
>
> regards,
>  - assaf
>
Okay, thanks anyhow for your effort. I will explore the suggested 
solutions next.
I was not sure, but I tried the same also with x86_64 cross compiled 
programs using qemu-i386, which worked. So, using your conclusion too, 
it looks like qemu is not behaving as expected.

Regards, Frans.

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