[v8,55/81] KVM: introspection: add crash action handling on event reply

Commit Message

Adalbert Lazăr March 30, 2020, 10:12 a.m. UTC

From: Mihai Donțu <[e-mail]>

This action is used in extreme cases such as blocking the spread of
malware as quickly as possible.

Signed-off-by: Mihai Donțu <[e-mail]>
Signed-off-by: Adalbert Lazăr <[e-mail]>
---
 virt/kvm/introspection/kvmi.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Patch

diff --git a/virt/kvm/introspection/kvmi.c b/virt/kvm/introspection/kvmi.c
index 2b8e6910e57b..517e77ab39c2 100644
--- a/virt/kvm/introspection/kvmi.c
+++ b/virt/kvm/introspection/kvmi.c
@@ -707,10 +707,38 @@  void kvmi_run_jobs(struct kvm_vcpu *vcpu)
 	}
 }
 
+static int kvmi_vcpu_kill(int sig, struct kvm_vcpu *vcpu)
+{
+	struct kernel_siginfo siginfo[1] = {};
+	int err = -ESRCH;
+	struct pid *pid;
+
+	rcu_read_lock();
+	pid = rcu_dereference(vcpu->pid);
+	if (pid)
+		err = kill_pid_info(sig, siginfo, pid);
+	rcu_read_unlock();
+
+	return err;
+}
+
+static void kvmi_vm_shutdown(struct kvm *kvm)
+{
+	struct kvm_vcpu *vcpu;
+	int i;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		kvmi_vcpu_kill(SIGTERM, vcpu);
+}
+
 void kvmi_handle_common_event_actions(struct kvm *kvm,
 				      u32 action, const char *str)
 {
 	switch (action) {
+	case KVMI_EVENT_ACTION_CRASH:
+		kvmi_vm_shutdown(kvm);
+		break;
+
 	default:
 		kvmi_err(KVMI(kvm), "Unsupported action %d for event %s\n",
 			 action, str);