Someone should have told us FB was handing out $100k just to make use of MPK for what it was designed to do
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Greatly appreciate your feedback! I'm not familiar with this style of attack, please elaborate? Do you expect existing 32-bit compatibility libraries in application? I was under the impression that the CS register is preserved across syscalls (=0 for x86-64). Feel free to DM.
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at least on Linux, the GDT that is used across all processes on the system contains an entry for a 32-bit code segment. so you can abuse an instruction like IRET (which is a single-byte instruction) to switch to 32-bit mode from normal 64-bit code.
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