[Bug 12375] New: ext4_block_to_path block too big cause cpu to burn

[Bug 12375] New: ext4_block_to_path block too big cause cpu to burn

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=12375

           Summary: ext4_block_to_path block too big cause cpu to burn
           Product: File System
           Version: 2.5
     KernelVersion: 2.6.28
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: dmaciejak@fortinet.com


Latest working kernel version: none
Earliest failing kernel version: unknow
Distribution: ubuntu
Hardware Environment: dell optiplex 740
Software Environment:
Problem Description:
when mounting specially crafted ext4 image, after some few seconds (5s),
kern.log is filled with some data and cpu reaches 100%
Steps to reproduce:
bunzip the image file enclosed and mount the image with  mount -t ext4 -o loop
ext4.img /media/tmp

note: i also tried the 2.6.28-ext4-3 patch but it does not help

Regards,

David Maciejak
Fortinet's FortiGuard Global Security Research Team


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[Bug 12375] ext4_block_to_path block too big cause cpu to burn

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=12375





------- Comment #1 from dmaciejak@fortinet.com  2009-01-07 02:57 -------
Created an attachment (id=19685)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19685&action=view)
kernel log extract


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[Bug 12375] ext4_block_to_path block too big cause cpu to burn

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=12375





------- Comment #2 from dmaciejak@fortinet.com  2009-01-07 02:57 -------
Created an attachment (id=19686)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19686&action=view)
ext4 image poc


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[Bug 12375] ext4_block_to_path block too big cause cpu to burn

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=12375


tytso@mit.edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|fs_ext4@kernel-bugs.osdl.org|tytso@mit.edu
             Status|NEW                         |ASSIGNED




------- Comment #3 from tytso@mit.edu  2009-01-17 15:44 -------
Created an attachment (id=19872)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19872&action=view)
Patch to address this bug

This patch should address this bug.  Thanks for reporting it!


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