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bug#50151: Coreutils, aarch64 and chroot


From: Frans de Boer
Subject: bug#50151: Coreutils, aarch64 and chroot
Date: Thu, 26 Aug 2021 10:00:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.0.1

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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