Bug#993658: qemu-user-static does not work through binfmt since 6.0

2021-09-04 Thread Vincent Bernat 
 ❦  4 September 2021 15:49 +03, Michael Tokarev:

>> Kernel: Linux 5.13.0-trunk-amd64 (SMP w/12 CPU threads)
>
> Can you please check if it works with not-so-fresh kernel
> (eg the one from bullseye)?
>
> I wont able to do this until late evening today.
>
> I'm guessing this is the upstream way to detect if we were
> called from binfmt subsystem (they done it within kernel)
> interferes with my way of doing the same without touching
> the kernel. Kernel side is a recent addition.

It works fine with 5.10.0-8-amd64 from bullseye. Thanks!
-- 
The Public is merely a multiplied "me."
-- Mark Twain

Bug#993658: qemu-user-static does not work through binfmt since 6.0

2021-09-04 Thread Michael Tokarev 

04.09.2021 14:33, Vincent Bernat wrote:
> Package: qemu-user-static
> Version: 1:6.1+dfsg-4
> Severity: critical
>

Hey!

Since 6.0, qemu-user-static does not seem to work properly through
binfmt. I am a bit lost on how to diagnose that:

...

When invoked through binfmt, the binaries seem to go from "I display
something wrong" to "I will wipe your entire home". That's what
happened to me when using cowbuilder. The chroot was not able to be


Ouch.


setup correctly and during the clean phase, cowbuilder did not detect
the bind mount and/or was not able to undo them, rm -rfing everything
that was mounted.

Downgrading qemu-user-static to 1:5.2+dfsg-11 fixes the issue.

...

Kernel: Linux 5.13.0-trunk-amd64 (SMP w/12 CPU threads)


Can you please check if it works with not-so-fresh kernel
(eg the one from bullseye)?

I wont able to do this until late evening today.

I'm guessing this is the upstream way to detect if we were
called from binfmt subsystem (they done it within kernel)
interferes with my way of doing the same without touching
the kernel. Kernel side is a recent addition.

Thanks!

/mjt

Bug#993658: qemu-user-static does not work through binfmt since 6.0

2021-09-04 Thread Vincent Bernat 
Package: qemu-user-static
Version: 1:6.1+dfsg-4
Severity: critical

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Hey!

Since 6.0, qemu-user-static does not seem to work properly through
binfmt. I am a bit lost on how to diagnose that:

 13:23 ❱ cat /proc/sys/fs/binfmt_misc/qemu-aarch64
enabled
interpreter /usr/libexec/qemu-binfmt/aarch64-binfmt-P
flags: POCF
offset 0
magic 7f454c46020101000200b700
mask ff00feff
 13:23 ❱ ./bin/busybox ls
BusyBox v1.30.1 (Debian 1:1.30.1-7) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.
[...]
 13:25 ❱ file bin/busybox
bin/busybox: ELF 64-bit LSB executable, ARM aarch64, version 1 (GNU/Linux), 
statically linked, BuildID[sha1]=6a67fd6d086c703062f3be2d751adf619aa67bc6, for 
GNU/Linux 3.7.0, stripped

When invoked through binfmt, the binaries seem to go from "I display
something wrong" to "I will wipe your entire home". That's what
happened to me when using cowbuilder. The chroot was not able to be
setup correctly and during the clean phase, cowbuilder did not detect
the bind mount and/or was not able to undo them, rm -rfing everything
that was mounted.

Downgrading qemu-user-static to 1:5.2+dfsg-11 fixes the issue.

 13:30 ❱ cat /proc/sys/fs/binfmt_misc/qemu-aarch64
enabled
interpreter /usr/libexec/qemu-binfmt/aarch64-binfmt-P
flags: POCF
offset 0
magic 7f454c46020101000200b700
mask ff00feff
 13:31 ❱ ./bin/busybox ls
bin  usr


- -- System Information:
Debian Release: bookworm/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), 
(101, 'experimental-debug'), (101, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.13.0-trunk-amd64 (SMP w/12 CPU threads)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

qemu-user-static depends on no packages.

Versions of packages qemu-user-static recommends:
ii  binfmt-support  2.2.1-1

Versions of packages qemu-user-static suggests:
ii  sudo  1.9.5p2-3

- -- no debconf information

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