linux-ext4 - [Bug 199865] out-of-bound write in ext4_init_block_bitmap() when mounting and operating a crafted ext4 image

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Date:   Thu, 14 Jun 2018 05:04:22 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 199865] out-of-bound write in ext4_init_block_bitmap() when
 mounting and operating a crafted ext4 image

https://bugzilla.kernel.org/show_bug.cgi?id=199865

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #5 from Theodore Tso (tytso@....edu) ---
This is triggered by the fact that allocation bitmaps are marked as
uninitialized for block group #0.  Ext4 shouldn't have paid attention to these
flags, since the prerequisite file system feature (uninit_bg or metadata_csum)
was not set.  In addition, even if one of those two feature flags were set,
ext4 should report an file system corruption if bitmaps for bg 0 are marked as
uninitialized and refuse to try to clear those bitmaps, since nothing good can
happen.

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