The mext_check_arguments function in fs/ext4/move_extent.c in the Linux kernel before 2.6.35 allows local users to overwrite an append-only file via a MOVE_EXT ioctl call that specifies this file as a donor.
- http://www.ubuntu.com/usn/USN-1000-1
- http://www.vmware.com/security/advisories/VMSA-2011-0003.html
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