This bug was fixed in the package gzip - 1.10-0ubuntu3.1
---------------
gzip (1.10-0ubuntu3.1) eoan; urgency=high
* Rebuild with binutils 2.33-2ubuntu1.1 (LP: #1843479)
- Build-depend on binutils (>= 2.33-2ubuntu1.1)
-- Balint Reczey <rbal...@ubuntu.com> Fri, 13 Dec 2019 16:41:46 +0100
** Changed in: gzip (Ubuntu Eoan)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1843479
Title:
gzip in Ubuntu Eoan results in Exec format error on WSL1
Status in binutils:
Confirmed
Status in binutils package in Ubuntu:
Fix Released
Status in gzip package in Ubuntu:
Fix Released
Status in binutils source package in Eoan:
Fix Committed
Status in gzip source package in Eoan:
Fix Released
Bug description:
IMPORTANT: Binutils was accidentally built in -proposed instead of in
a PPA. I'm rebuilding it in https://launchpad.net/~ci-train-ppa-
service/+archive/ubuntu/3876 for the -security pocket.
[Impact]
* Running gzip on WSL1 results in the following error:
$ gzip
-bash: /bin/gzip: cannot execute binary file: Exec format error
* The error occurs frequently in package updates and makes gzip inoperable
on WSL1
* The problem is caused by PT_LOAD offset pointing past the end of file and
the fix is fixing strip to not generate such ELF files and recompiling gzip
with the fixed strip.
[Test Case]
* Check the gzip binary for wrong offset:
$ FILE=/usr/bin/gzip; readelf -W --program-headers $FILE | awk -v
size=$(stat -c %s $FILE) '/^ LOAD/ {if (strtonum($2) > size) {print "wrong
offset ("$2" ("strtonum($2)") points past EOF:" size; exit 1;}}'
[ Regression Potential ]
* The binutils fix could cause binutils to generate invalid ELF files. The
fix is very small and isolated and has been tested and accepted by upstream,
which makes such problems unlikely.
* Bugs in the toolchain in general can make the rebuilt gzip show new
errors, but this generally applies to many SRUs and security updates. The
testing period in proposed should mitigate this risk.
[Originial Bug Text]
Summary:
Running gzip on WSL1 results in the following error:
$ gzip
-bash: /bin/gzip: cannot execute binary file: Exec format error
What I expect to happen:
gzip executes correctly on WSL1.
What happens instead:
gzip fails with an Exec format error.
Notes:
I suspect a change in how gzip is being built for Eoan is causing
issues with ELF parsing on the WSL1 translation layer. For example:
On Disco with gzip 1.9-3:
$ file /bin/gzip
/bin/gzip: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV),
dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux
3.2.0, BuildID[sha1]=efa859c26eaf8e035efe9a139361e2a60cd17b3e, stripped
On Eoan with gzip 1.10-0ubuntu3:
$ file /bin/gzip
/bin/gzip: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV),
dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2,
BuildID[sha1]=bc0f5994544c2a469d04c914bf4bf44b4ded6040, for GNU/Linux 3.2.0,
stripped
Eoan ships with gzip 1.10, while Disco ships with gzip 1.9, but I do
not believe this is an issue in 1.10 because this error does not occur
when building gzip from GNU project source on Ubuntu Eoan.
Justifications:
WSL1 will need to be patched in future Windows builds for this change
in ELF. However that patch will likely not be backported to older
builds of Windows, including Windows Enterprise/Server 2019.
To ensure Eoan can run on current and older builds of Windows Ubuntu
should consider looking at how it's building gzip and see if it can be
made to 'play nice' until WSL1 can be updated.
This was originally reported here:
https://github.com/microsoft/WSL/issues/4461
Details:
Description: Ubuntu Eoan Ermine (development branch)
Release: 19.10
gzip:
Installed: 1.10-0ubuntu3
Candidate: 1.10-0ubuntu3
Version table:
*** 1.10-0ubuntu3 500
500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages
100 /var/lib/dpkg/status
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