This commit fixes bugs that can cause crashes and memory corruption
when the mremap hook is called. The problem occurs because of the
ellipses (...) in the mremap intercept function. The ellipses cover
the optional new_addr argument on Linux. This commit removes the
ellipses and adds an explicit 5th argument.
This commit also adds a hook for shmdt. The code only works on Linux
at the moment as it needs to read /proc/self/maps to determine the
size of the shared memory segment.
Additionally, this commit removes the mmap hook. There is no
apparent benefit for detecting mmap(..., PROT_NONE, ...) and it
seems to cause problems when threads are in use.
Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
80ec79cfc8