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by mrob
2957 days ago
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Locking up the machine is a possibility when you disable interrupts. Disabling interrupts with the cli instruction needs the IO privilege level (IOPL) to be at least as high as the protection ring the code is running in. Linux runs userspace code in ring 3, so the IOPL has to be set to 3 with the iopl call first. This requires the CAP_SYS_RAWIO capability, which allows you to do pretty much anything already. |
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