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![]() This is a crude protection against IOPL elevation attacks. If for any reason we find ourselves about to switch to a user mode thread with IOPL != 0, we'll now simply panic the kernel. If this happens, it basically means that something tricked the kernel into incorrectly modifying the IOPL of a thread, so it's no longer safe to trust the kernel anyway. |
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i386 | ||
PC |