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Kernel: Disable x86 RDTSC instruction in userspace

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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.
This commit is contained in:
Andreas Kling 2020-01-01 18:18:02 +01:00
parent dfd759f75a
commit 38f93ef13b
6 changed files with 25 additions and 1 deletions
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Kernel/Arch/i386/CPU.h
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@ -513,4 +513,5 @@ extern bool g_cpu_supports_pae;
extern bool g_cpu_supports_pge;
extern bool g_cpu_supports_smep;
extern bool g_cpu_supports_sse;
extern bool g_cpu_supports_tsc;
extern bool g_cpu_supports_umip;