Escaping the guest kernel requires finding a vulnerability in the Virtual Machine Monitor’s device emulation or the CPU’s virtualization features, which are rare and highly prized.
clock_t end = clock();
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Terminal applications have a “cursor” that they can move around, just like a text editor. You can tell that cursor “go to line 3, delete everything, then print out this new text” by using VT100 sequences. And you can use it to replace existing characters with new ones, without re-emitting a whole line.