[Ubuntu 20.10] - When zlib acceleration is enabled, gzip fails when given multiple files larger than 5KB (gzip)

[bugproxy]

When zlib acceleration is enabled, gzip fails when given multiple files larger than 5KB.

This problem does not happen when running gzip against a single file at a time. It only happens when you provide multiple files as gzip arguments.

So this works whether zlib acceleration is enabled or not:

for file in file1 file2; do gzip $file ; done

But this fails (when zlib acceleration is enabled):

gzip file1 file2

The patch to fix this has been accepted upstream:
https://git.savannah.gnu.org/cgit/gzip.git/commit/?id=be0a534ba2b6e77da289de8da79e70843b1028cc

[Impact]

 * With zlib acceleration enabled, attempting to compress multiple files
   over 5MB would cause a segmentation fault.

 * The files could still be compressed in separate commands

[Test Case]

 * Create two files that are larger than 5MB

 * Enable zlib acceleration (z15 hardware required)

 * Run the command gzip <file1> <file2>

 * NOTE: we do not have access to z15 hardware and therefore are relying
   on IBM to verify this fix

[Where problems could occur]

 * Due to lack of testing resources, it's possible the bug has not been
   fully fixed, and the segmentation fault could still occur.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gzip - 1.10-2ubuntu2

---------------
gzip (1.10-2ubuntu2) hirsute; urgency=medium

  [ William 'jawn-smith' Wilson ]
  * Applying patch from upstream to fix a segfault caused by passing
    multiple files larger than 5kb to a gzip command while zlib
    acceleration is enabled (LP: #1901528)

 -- Brian Murray <email address hidden> Mon, 18 Jan 2021 10:35:03 -0800

[Matthieu Clemenceau (mclemenceau)]

Frank, This is resolved in Hirsute, Do you also want this in Groovy? If yes, can you add it as a affected serie?
Thx

[Dimitri John Ledkov (xnox)]

Based on tags, it is requested for Groovy too.

[Frank Heimes (fheimes)]

+1 (according to title prefix and tag 'targetmilestone-inin2010 ')

[Steve Langasek (vorlon)]

Hello bugproxy, or anyone else affected,

Accepted gzip into groovy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gzip/1.10-2ubuntu1.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-groovy to verification-done-groovy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-groovy. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2021-01-20 05:23 EDT-------
s390x build of gzip 1.10-2ubuntu1.1 fixes the issue.

[Frank Heimes (fheimes)]

Thx Ilya for the verification on groovy - I'm adjusting the tags accordingly ...

[Łukasz Zemczak (sil2100)]

The verification of the Stable Release Update for gzip has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gzip - 1.10-2ubuntu1.1

---------------
gzip (1.10-2ubuntu1.1) groovy; urgency=medium

  * Applying patch from upstream to fix a segfault caused by passing
    multiple files larger than 5kb to a gzip command while zlib
    acceleration is enabled (LP: #1901528)

 -- William 'jawn-smith' Wilson <email address hidden> Tue, 19 Jan 2021 12:57:57 -0600

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2021-01-28 09:27 EDT-------
IBM Bugzilla status->closed, Fix Released with groovy