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 …
It's not old; it's current/only ABI. Trap&emulate would be very very slow. GCC(+ld due to relaxation) could be trained not to use the local exec model & then maybe trap would be ok for old code not recompiled...?
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Actually the option already exists. -mno-tls-direct-seg-refs https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html …
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See also https://www.akkadia.org/drepper/tls.pdf page 47 - it looks like Drepper overlooked a very good reason why Sun did things the way they did when he NIH'd the GNU variant of it.
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