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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'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Impish)
Status: New => Incomplete
** Changed in: linux (Ubuntu Jammy)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1972281
Title:
ext4: limit length to bitmap_maxbytes
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Impish:
Incomplete
Status in linux source package in Jammy:
Incomplete
Bug description:
[Impact]
Abusing ext4_fallocate() (as a normal user) triggers a BUG()/kernel panic.
[Fix]
Apply this upstream fix:
commit 2da376228a2427501feb9d15815a45dbdbdd753e
Author: Tadeusz Struk <[email protected]>
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.
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