The btrfs_ioctl_clone function in fs/btrfs/ioctl.c in the btrfs
functionality in the Linux kernel 2.6.29 through 2.6.32, and possibly
other versions, does not ensure that a cloned file descriptor has been
opened for reading, which allows local users to read sensitive
information from a write-only file descriptor.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20100518 Re: kernel: btrfs: check for read permission on src file in the clone ioctl
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