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Use fchmod() to change permissions of the lock file instead of chmod(), thus avoid the race that can be exploited to set a symbolic link to any file or directory in the system. Signed-off-by: Matthieu Herrb <matthieu.herrb@laas.fr> Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com> (cherry picked from commit b67581cf) (cherry picked from commit 12f65819)
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