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Kernel: Disable x86 RDTSC instruction in userspace
It's still possible to read the TSC via the read_tsc() syscall, but we will now clear some of the bottom bits for unprivileged users.
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@ -34,6 +34,7 @@ kinds of crashes.
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* `-X`: Attempt to execute non-executable memory. (Not mapped with PROT\_EXEC.)
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* `-U`: Attempt to trigger an x86 User Mode Instruction Prevention fault.
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* `-I`: Use an x86 I/O instruction in userspace.
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* `-c`: Read the x86 TSC (Time Stamp Counter) directly.
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## Examples
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