2c7bdaf9f1
Now that we dlopen() so many deps, it might happen by accident that we end up dlopen()ening stuff when we entered a container, which we should really avoid, to not mix host and container libraries. Let's add a global variable we can set when we want to block dlopen() to ever succeed. This is then checked primarily in dlopen_many_sym_or_warn(), where we'll generate EPERM plus a log message. There are a couple of other places we invoke dlopen(), without going through dlopen_many_sym_or_warn(). This adds the same check there.
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