Public bug reported:
When running Ubuntu Noble in an arm32 Docker container, on certain hosts
(Azure VM CI agents), tar fails to extract certain archives that include
folders with specific permissions set.
Here's a concise repro. The error occurs in when building the
Dockerfile. I can only get this to work on Azure VMs, but can't find out
why.
```Dockerfile
FROM ubuntu.azurecr.io/ubuntu:noble
# Create the problematic archive
RUN mkdir /test \
&& chmod 775 /test \
&& cd /test \
&& mkdir 775 \
&& chmod 775 775 \
&& touch 775/test.txt \
&& chmod 644 775/test.txt \
&& tar -czvf /test.tar.gz .
# Extracting it gives an error
RUN mkdir -p /test2 \
&& tar -tzvf /test.tar.gz \
&& tar -oxzf /test.tar.gz -C /test2
```
What I expected to happen: The test.tar.gz archive should be
successfully extracted to the /test2 directory.
What happened instead: Tar throws the following error:
```
tar: ./775: Cannot change mode to rwxrwxr-x: Operation not permitted
tar: Exiting with failure status due to previous errors
```
The Ubuntu container is running as root so there shouldn't be any
permission errors.
Since this is running in a container, I observed this happening on the
following kernel:
`Linux version 5.15.148.2-2.cm2 (root@CBL-Mariner) (gcc (GCC) 11.2.0, GNU ld
(GNU Binutils) 2.37) #1 SMP Fri Feb 23 23:38:33 UTC 2024`.
I was not able to reproduce it using Ubuntu 22.04 Jammy
(ubuntu.azurecr.io/ubuntu:jammy), using the same kernel as above.
Additionally I was not able to reproduce this on the kernel `Linux
cb0507859b24 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11
04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux`, which is running on
my work machine, using Docker qemu emulation for the arm32 image (I do
not have access to an arm32 native machine).
Ubuntu version: Ubuntu Noble Numbat (development branch) 24.04 (from
ubuntu.azurecr.io/ubuntu:noble)
tar version: `1.35+dfsg-3`
** Affects: tar (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2059734
Title:
Tar fails to extract archives that include folders with certain
permissions on armhf
Status in tar package in Ubuntu:
New
Bug description:
When running Ubuntu Noble in an arm32 Docker container, on certain
hosts (Azure VM CI agents), tar fails to extract certain archives that
include folders with specific permissions set.
Here's a concise repro. The error occurs in when building the
Dockerfile. I can only get this to work on Azure VMs, but can't find
out why.
```Dockerfile
FROM ubuntu.azurecr.io/ubuntu:noble
# Create the problematic archive
RUN mkdir /test \
&& chmod 775 /test \
&& cd /test \
&& mkdir 775 \
&& chmod 775 775 \
&& touch 775/test.txt \
&& chmod 644 775/test.txt \
&& tar -czvf /test.tar.gz .
# Extracting it gives an error
RUN mkdir -p /test2 \
&& tar -tzvf /test.tar.gz \
&& tar -oxzf /test.tar.gz -C /test2
```
What I expected to happen: The test.tar.gz archive should be
successfully extracted to the /test2 directory.
What happened instead: Tar throws the following error:
```
tar: ./775: Cannot change mode to rwxrwxr-x: Operation not permitted
tar: Exiting with failure status due to previous errors
```
The Ubuntu container is running as root so there shouldn't be any
permission errors.
Since this is running in a container, I observed this happening on the
following kernel:
`Linux version 5.15.148.2-2.cm2 (root@CBL-Mariner) (gcc (GCC) 11.2.0, GNU ld
(GNU Binutils) 2.37) #1 SMP Fri Feb 23 23:38:33 UTC 2024`.
I was not able to reproduce it using Ubuntu 22.04 Jammy
(ubuntu.azurecr.io/ubuntu:jammy), using the same kernel as above.
Additionally I was not able to reproduce this on the kernel `Linux
cb0507859b24 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11
04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux`, which is running on
my work machine, using Docker qemu emulation for the arm32 image (I do
not have access to an arm32 native machine).
Ubuntu version: Ubuntu Noble Numbat (development branch) 24.04 (from
ubuntu.azurecr.io/ubuntu:noble)
tar version: `1.35+dfsg-3`
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/tar/+bug/2059734/+subscriptions
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