Does #Meltdown bypass segment limit? To be specific, is e.g. Linux 2.0 on 32-bit x86 vulnerable? If not, maybe consider http://wiki.osdev.org/X86-64#Segmentation_in_Long_Mode …
Arguably Linux 2.0 can't even run programs with the TLS ABI, but musl can support it with modify_ldt; other issues like lack of *64 syscalls end up being the show-stopper.
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Of course, I didn't literally suggest use of Linux 2.0 along with a modern libc. It was to be specific about the use of segment limits.
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