1 files changed, 69 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_send_signal_kern.c b/tools/testing/selftests/bpf/progs/test_send_signal_kern.c
new file mode 100644
index 000000000000..176a355e3062
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_send_signal_kern.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Facebook
+#include <vmlinux.h>
+#include <linux/version.h>
+#include <bpf/bpf_helpers.h>
+
+struct task_struct *bpf_task_from_pid(int pid) __ksym;
+void bpf_task_release(struct task_struct *p) __ksym;
+int bpf_send_signal_task(struct task_struct *task, int sig, enum pid_type type, u64 value) __ksym;
+
+__u32 sig = 0, pid = 0, status = 0, signal_thread = 0, target_pid = 0;
+
+static __always_inline int bpf_send_signal_test(void *ctx)
+{
+	struct task_struct *target_task = NULL;
+	int ret;
+	u64 value;
+
+	if (status != 0 || pid == 0)
+		return 0;
+
+	if ((bpf_get_current_pid_tgid() >> 32) == pid) {
+		if (target_pid) {
+			target_task = bpf_task_from_pid(target_pid);
+			if (!target_task)
+				return 0;
+			value = 8;
+		}
+
+		if (signal_thread) {
+			if (target_pid)
+				ret = bpf_send_signal_task(target_task, sig, PIDTYPE_PID, value);
+			else
+				ret = bpf_send_signal_thread(sig);
+		} else {
+			if (target_pid)
+				ret = bpf_send_signal_task(target_task, sig, PIDTYPE_TGID, value);
+			else
+				ret = bpf_send_signal(sig);
+		}
+		if (ret == 0)
+			status = 1;
+	}
+
+	if (target_task)
+		bpf_task_release(target_task);
+
+	return 0;
+}
+
+SEC("tracepoint/syscalls/sys_enter_nanosleep")
+int send_signal_tp(void *ctx)
+{
+	return bpf_send_signal_test(ctx);
+}
+
+SEC("tracepoint/sched/sched_switch")
+int send_signal_tp_sched(void *ctx)
+{
+	return bpf_send_signal_test(ctx);
+}
+
+SEC("perf_event")
+int send_signal_perf(void *ctx)
+{
+	return bpf_send_signal_test(ctx);
+}
+
+char __license[] SEC("license") = "GPL";