The btrfs_ioctl_clone function in fs/btrfs/ioctl.c in the Linux kernel
before 2.6.35 allows local users to overwrite an append-only file via
a (1) BTRFS_IOC_CLONE or (2) BTRFS_IOC_CLONE_RANGE ioctl call that
specifies this file as a donor.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
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