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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Message-ID: <bug-199865-13602-wqw0AzWRIg@https.bugzilla.kernel.org/>
Date:   Thu, 14 Jun 2018 05:12:51 +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

--- Comment #6 from Theodore Tso (tytso@....edu) ---
Oops, ignore comment #5; this erroneously posted to the wrong bug.

Bug #199865 is triggered by the fact block group descriptors were corrupted due
to the fact that one of the allocation bitmaps overlapped with the block group
descriptors.  Then when a block bitmap needed to be initialized, the corrupted
block group descriptors resulted in the byte before the bitmap getting zero'ed.

This will be fixed via these patches:

    ext4: always check block group bounds in ext4_init_block_bitmap()
    ext4: make sure bitmaps and the inode table don't overlap with bg
descriptors

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