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Add rdtsc spoof hook

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This commit is contained in:
Gregory Lirent 2024-07-02 09:32:49 +03:00
parent 3b923599d9
commit 97c120d05c
Signed by: lirent
GPG Key ID: F616BE337EFFEE77
1 changed files with 51 additions and 0 deletions
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patches/kernel/9999-rdtsc-spoof-hook.patch Normal file
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@ -0,0 +1,51 @@
diff -Naur --no-dereference a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
--- a/arch/x86/kvm/vmx/vmx.c 2024-07-01 21:03:34.000000000 +0300
+++ b/arch/x86/kvm/vmx/vmx.c 2024-07-01 20:24:05.000000000 +0300
@@ -6137,6 +6137,10 @@
[EXIT_REASON_ENCLS] = handle_encls,
[EXIT_REASON_BUS_LOCK] = handle_bus_lock_vmexit,
[EXIT_REASON_NOTIFY] = handle_notify,
+ [EXIT_REASON_RDTSC] = handle_rdtsc,
+ [EXIT_REASON_RDTSCP] = handle_rdtscp,
+ [EXIT_REASON_UMWAIT] = handle_umwait,
+ [EXIT_REASON_TPAUSE] = handle_tpause,
};
static const int kvm_vmx_max_exit_handlers =
@@ -6079,6 +6079,36 @@
return 1;
}
+static int handle_rdtsc(struct kvm_vcpu *vcpu)
+{
+ u64 _rdtsc = rdtsc();
+ printk_once("[HookEntry] hook entry function handle_rdtsc is working, return the rdtsc() if no hook , you can hook here!\n");
+ vcpu->arch.regs[VCPU_REGS_RAX] = _rdtsc & -1u;
+ vcpu->arch.regs[VCPU_REGS_RDX] = (_rdtsc >> 32) & -1u;
+ return kvm_skip_emulated_instruction(vcpu);
+}
+
+static int handle_rdtscp(struct kvm_vcpu *vcpu)
+{
+ u64 _rdtsc = rdtsc();
+ printk_once("[HookEntry] hook entry function handle_rdtscp is working, return the rdtsc() if no hook , you can hook here!\n");
+ vcpu->arch.regs[VCPU_REGS_RAX] = _rdtsc & -1u;
+ vcpu->arch.regs[VCPU_REGS_RDX] = (_rdtsc >> 32) & -1u;
+ return kvm_skip_emulated_instruction(vcpu);
+}
+
+static int handle_umwait(struct kvm_vcpu *vcpu)
+{
+ kvm_skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+static int handle_tpause(struct kvm_vcpu *vcpu)
+{
+ kvm_skip_emulated_instruction(vcpu);
+ return 1;
+}
+
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs