mm/shmem.c in the Linux kernel through 3.15.1 does not properly
implement the interaction between range notification and hole
punching, which allows local users to cause a denial of service
(i_mutex hold) by using the mmap system call to access a hole, as
demonstrated by interfering with intended shmem activity by blocking
completion of (1) an MADV_REMOVE madvise call or (2) an
FALLOC_FL_PUNCH_HOLE fallocate call.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[mm-commits] 20140617 + shmem-fix-faulting-into-a-hole-while-its-punched.patch added to -mm tree
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