linux-ext4 - [Bug 200071] BUG() in jbd2_journal_dirty_metadata() that kernel cannot handle when mounting and operating a crafted ext4 image

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Date:   Mon, 18 Jun 2018 12:52:29 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 200071] BUG() in jbd2_journal_dirty_metadata() that kernel
 cannot handle when mounting and operating a crafted ext4 image

https://bugzilla.kernel.org/show_bug.cgi?id=200071

Theodore Tso (tytso@....edu) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |tytso@....edu

--- Comment #4 from Theodore Tso (tytso@....edu) ---
This bug is addressed by these two commits:

jbd2: don't mark block as modified if the handle is out of credits
     http://patchwork.ozlabs.org/patch/930638/

ext4: avoid running out of journal credits when appending to an inline file
     http://patchwork.ozlabs.org/patch/930641/

This bug can be triggered without needing a specially crafted file system
(although, of course, the inline_data feature has to be enabled in the file
system --- which is currently not enabled by the default).

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