Ubuntu
linux package

setting extended attribute may cause memory leak

Bug #1924611 reported by Thadeu Lima de Souza Cascardo
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Invalid
Undecided
Unassigned
Xenial
Fix Released
Critical
Thadeu Lima de Souza Cascardo
Bionic
Invalid
Undecided
Unassigned
Focal
Invalid
Undecided
Unassigned
linux-gke-5.3 (Ubuntu)
Invalid
Undecided
Unassigned
Xenial
Invalid
Undecided
Unassigned
Bionic
Fix Released
Critical
Thadeu Lima de Souza Cascardo
Focal
Invalid
Undecided
Unassigned
linux-hwe (Ubuntu)
Invalid
Undecided
Unassigned
Xenial
Invalid
Undecided
Unassigned
Bionic
Fix Released
Critical
Unassigned
Focal
Invalid
Undecided
Unassigned
linux-oem-5.6 (Ubuntu)
Invalid
Undecided
Unassigned
Xenial
Invalid
Undecided
Unassigned
Bionic
Invalid
Undecided
Unassigned
Focal
Fix Released
Critical
Thadeu Lima de Souza Cascardo
linux-raspi2-5.3 (Ubuntu)
Invalid
Undecided
Unassigned
Xenial
Invalid
Undecided
Unassigned
Bionic
Fix Released
Critical
Thadeu Lima de Souza Cascardo
Focal
Invalid
Undecided
Unassigned

Bug Description

[Impact]
A memory leak may happen when an error happens when setting extended attributes.

[Fix]
The issue was introduced by an improper backport, so the fix is specific to Ubuntu, so a SAUCE patch.

[Test case]
Test setting attribute under a user namespace.

[Regression potential]
A double free bug might be introduced. Or setting extended attributes might fail.

Thadeu Lima de Souza Cascardo (cascardo)
Changed in linux (Ubuntu Xenial):
status: New → In Progress
importance: Undecided → Critical
assignee: nobody → Thadeu Lima de Souza Cascardo (cascardo)
Changed in linux (Ubuntu):
status: New → Invalid
Changed in linux-oem-5.6 (Ubuntu):
status: New → Invalid
Changed in linux (Ubuntu Focal):
status: New → Invalid
Changed in linux-oem-5.6 (Ubuntu Xenial):
status: New → Invalid
Changed in linux-oem-5.6 (Ubuntu Focal):
status: New → Triaged
importance: Undecided → Critical
assignee: nobody → Thadeu Lima de Souza Cascardo (cascardo)
Changed in linux (Ubuntu Bionic):
status: New → Invalid
Changed in linux-oem-5.6 (Ubuntu Bionic):
status: New → Invalid
Changed in linux-gke-5.3 (Ubuntu):
status: New → Invalid
Changed in linux-gke-5.3 (Ubuntu Xenial):
status: New → Invalid
Changed in linux-gke-5.3 (Ubuntu Focal):
status: New → Invalid
Changed in linux-gke-5.3 (Ubuntu Bionic):
assignee: nobody → Thadeu Lima de Souza Cascardo (cascardo)
importance: Undecided → Critical
status: New → Triaged
Changed in linux-raspi2-5.3 (Ubuntu):
status: New → Invalid
Changed in linux-raspi2-5.3 (Ubuntu Xenial):
status: New → Invalid
Changed in linux-raspi2-5.3 (Ubuntu Focal):
status: New → Invalid
Changed in linux-raspi2-5.3 (Ubuntu Bionic):
assignee: nobody → Thadeu Lima de Souza Cascardo (cascardo)
importance: Undecided → Critical
status: New → In Progress
Revision history for this message
Stefan Bader (smb) wrote :

The parent for bionic:linux-gke-5.3 and bionic:linux-raspi2-5.3 is bionic:linux-hwe (I did not want to decide this myself but the former 2 could be dropped from this report).

Changed in linux-oem-5.6 (Ubuntu Focal):
status: Triaged → Fix Committed
Changed in linux-hwe (Ubuntu Bionic):
status: New → Invalid
Changed in linux-hwe (Ubuntu Focal):
status: New → Invalid
Changed in linux-hwe (Ubuntu Bionic):
importance: Undecided → Critical
status: Invalid → Fix Committed
Changed in linux-hwe (Ubuntu Xenial):
status: New → Invalid
Changed in linux (Ubuntu Xenial):
status: In Progress → Fix Committed
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-xenial
tags: added: verification-needed-bionic
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

Thadeu Lima de Souza Cascardo (cascardo)
tags: added: verification-done-xenial
removed: verification-needed-xenial
Revision history for this message
Thadeu Lima de Souza Cascardo (cascardo) wrote :

$ uname -a
Linux bionic 5.3.0-74-generic #70-Ubuntu SMP Fri Apr 16 08:44:31 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ ./leak.sh
$ echo $?
0
$

Revision history for this message
Stefan Bader (smb) wrote :

For bionic:linux-hwe, the same patch was applied, so we can rely on the xenial verification for that.

tags: added: verification-done-bionic
removed: verification-needed-bionic
Revision history for this message
Thadeu Lima de Souza Cascardo (cascardo) wrote :

$ uname -a
Linux bionic 5.3.0-1043-gke #46-Ubuntu SMP Fri Apr 16 09:14:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ ./leak.sh
$ echo $?
0
$

Revision history for this message
Thadeu Lima de Souza Cascardo (cascardo) wrote :

$ uname -a
Linux focal 5.6.0-1055-oem #59-Ubuntu SMP Fri Apr 16 08:43:28 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ ./leak.sh
$ echo $?
0
$

Changed in linux-hwe (Ubuntu):
status: New → Invalid
tags: added: verification-done-focal
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-gke-5.3 - 5.3.0-1043.46

---------------
linux-gke-5.3 (5.3.0-1043.46) bionic; urgency=medium

  * bionic/linux-gke-5.3: 5.3.0-1043.46 -proposed tracker (LP: #1924650)

  [ Ubuntu: 5.3.0-74.70 ]

  * bionic/linux-hwe: 5.3.0-74.70 -proposed tracker (LP: #1924647)
  * setting extended attribute may cause memory leak (LP: #1924611)
    - SAUCE: vfs_setxattr: free converted value if xattr_permission returns error

 -- Stefan Bader <email address hidden> Fri, 16 Apr 2021 10:57:46 +0200

Changed in linux-gke-5.3 (Ubuntu Bionic):
status: Triaged → Fix Released
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-hwe - 5.3.0-74.70

---------------
linux-hwe (5.3.0-74.70) bionic; urgency=medium

  * bionic/linux-hwe: 5.3.0-74.70 -proposed tracker (LP: #1924647)

  * setting extended attribute may cause memory leak (LP: #1924611)
    - SAUCE: vfs_setxattr: free converted value if xattr_permission returns error

 -- Stefan Bader <email address hidden> Fri, 16 Apr 2021 10:22:31 +0200

Changed in linux-hwe (Ubuntu Bionic):
status: Fix Committed → Fix Released
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-raspi2-5.3 - 5.3.0-1040.42

---------------
linux-raspi2-5.3 (5.3.0-1040.42) bionic; urgency=medium

  * bionic/linux-raspi2-5.3: 5.3.0-1040.42 -proposed tracker (LP: #1924651)

  [ Ubuntu: 5.3.0-74.70 ]

  * bionic/linux-hwe: 5.3.0-74.70 -proposed tracker (LP: #1924647)
  * setting extended attribute may cause memory leak (LP: #1924611)
    - SAUCE: vfs_setxattr: free converted value if xattr_permission returns error

 -- Stefan Bader <email address hidden> Fri, 16 Apr 2021 11:13:35 +0200

Changed in linux-raspi2-5.3 (Ubuntu Bionic):
status: In Progress → Fix Released
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 4.4.0-210.242

---------------
linux (4.4.0-210.242) xenial; urgency=medium

  * xenial/linux: 4.4.0-210.242 -proposed tracker (LP: #1924644)

  * setting extended attribute may cause memory leak (LP: #1924611)
    - SAUCE: vfs_setxattr: free converted value if xattr_permission returns error

 -- Stefan Bader <email address hidden> Fri, 16 Apr 2021 11:33:09 +0200

Changed in linux (Ubuntu Xenial):
status: Fix Committed → Fix Released
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1055.59

---------------
linux-oem-5.6 (5.6.0-1055.59) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1055.59 -proposed tracker (LP: #1924646)

  * setting extended attribute may cause memory leak (LP: #1924611)
    - SAUCE: vfs_setxattr: free converted value if xattr_permission returns error

 -- Stefan Bader <email address hidden> Fri, 16 Apr 2021 10:28:23 +0200

Changed in linux-oem-5.6 (Ubuntu Focal):
status: Fix Committed → Fix Released
Juerg Haefliger (juergh)
tags: added: kernel-daily-bug
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