ext4: limit length to bitmap_maxbytes

[Paolo Pisati]

[Impact]
Abusing ext4_fallocate() (as a normal user) triggers a BUG()/kernel panic.

[Fix]
Apply this upstream fix:

commit 2da376228a2427501feb9d15815a45dbdbdd753e
Author: Tadeusz Struk <email address hidden>
Date: Thu Mar 31 13:05:15 2022 -0700

ext4: limit length to bitmap_maxbytes - blocksize in punch_hole

[Test]
The reporter has provided a working reproducer.

[Where problems could occur]
Upstream fix already slated for @stable inclusion.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1972281

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/5.4.0-112.126 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-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

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!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/4.15.0-179.188 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!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/5.15.0-32.33 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-jammy' to 'verification-done-jammy'. If the problem still exists, change the tag 'verification-needed-jammy' to 'verification-failed-jammy'.

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!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/5.13.0-44.49 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-impish' to 'verification-done-impish'. If the problem still exists, change the tag 'verification-needed-impish' to 'verification-failed-impish'.

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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-180.189

---------------
linux (4.15.0-180.189) bionic; urgency=medium

  * bionic/linux: 4.15.0-180.189 -proposed tracker (LP: #1974013)

  * CVE-2022-29581
    - net/sched: cls_u32: fix netns refcount changes in u32_change()

  * Unprivileged users may use PTRACE_SEIZE to set PTRACE_O_SUSPEND_SECCOMP
    option (LP: #1972740)
    - ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE

  * ext4: limit length to bitmap_maxbytes (LP: #1972281)
    - ext4: limit length to bitmap_maxbytes - blocksize in punch_hole

 -- Kleber Sacilotto de Souza <email address hidden> Wed, 18 May 2022 15:56:44 +0200

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.4.0-113.127

---------------
linux (5.4.0-113.127) focal; urgency=medium

  * focal/linux: 5.4.0-113.127 -proposed tracker (LP: #1973980)

  * CVE-2022-29581
    - net/sched: cls_u32: fix netns refcount changes in u32_change()

  * CVE-2022-1116
    - io_uring: fix fs->users overflow

  * ext4: limit length to bitmap_maxbytes (LP: #1972281)
    - ext4: limit length to bitmap_maxbytes - blocksize in punch_hole

  * Unprivileged users may use PTRACE_SEIZE to set PTRACE_O_SUSPEND_SECCOMP
    option (LP: #1972740)
    - ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE

 -- Stefan Bader <email address hidden> Wed, 18 May 2022 16:07:54 +0200

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.13.0-44.49

---------------
linux (5.13.0-44.49) impish; urgency=medium

  * impish/linux: 5.13.0-44.49 -proposed tracker (LP: #1973941)

  * CVE-2022-29581
    - net/sched: cls_u32: fix netns refcount changes in u32_change()

  * Unprivileged users may use PTRACE_SEIZE to set PTRACE_O_SUSPEND_SECCOMP
    option (LP: #1972740)
    - ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE

  * ext4: limit length to bitmap_maxbytes (LP: #1972281)
    - ext4: limit length to bitmap_maxbytes - blocksize in punch_hole

 -- Kleber Sacilotto de Souza <email address hidden> Wed, 18 May 2022 14:56:02 +0200

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.15.0-33.34

---------------
linux (5.15.0-33.34) jammy; urgency=medium

  * jammy/linux: 5.15.0-33.34 -proposed tracker (LP: #1973924)

  * CVE-2022-29581
    - net/sched: cls_u32: fix netns refcount changes in u32_change()

  * ext4: limit length to bitmap_maxbytes (LP: #1972281)
    - ext4: limit length to bitmap_maxbytes - blocksize in punch_hole

  * Unprivileged users may use PTRACE_SEIZE to set PTRACE_O_SUSPEND_SECCOMP
    option (LP: #1972740)
    - ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE

 -- Stefan Bader <email address hidden> Wed, 18 May 2022 15:11:00 +0200