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Is Linux secure?

Let me rephrase, is a huge pile of C code, running in privileged mode in a shared address space, highly concurrent, using its own homegrown memory model based on volatile instead of the one the language spec defines and the compilers implement, dealing with untrusted data, implementing many complex protocols, data formats, & functionality, managing a bunch of "objects" with complex ownership and lifetime semantics, embedding its own JIT — secure?