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Given an illegal selinux option it was possible for match_token to work in random memory at the end of the match_table_t array. Note that privilege is required to perform a context mount, so this issue is effectively limited to root only. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>