1 files changed, 88 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c
new file mode 100644
index 000000000000..24d493482ffc
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
+
+#define _GNU_SOURCE
+#include <test_progs.h>
+#include "test_ns_current_pid_tgid.skel.h"
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <sys/mount.h>
+#include <sys/fcntl.h>
+
+#define STACK_SIZE (1024 * 1024)
+static char child_stack[STACK_SIZE];
+
+static int test_current_pid_tgid(void *args)
+{
+	struct test_ns_current_pid_tgid__bss  *bss;
+	struct test_ns_current_pid_tgid *skel;
+	int err = -1, duration = 0;
+	pid_t tgid, pid;
+	struct stat st;
+
+	skel = test_ns_current_pid_tgid__open_and_load();
+	if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
+		goto cleanup;
+
+	pid = syscall(SYS_gettid);
+	tgid = getpid();
+
+	err = stat("/proc/self/ns/pid", &st);
+	if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err))
+		goto cleanup;
+
+	bss = skel->bss;
+	bss->dev = st.st_dev;
+	bss->ino = st.st_ino;
+	bss->user_pid = 0;
+	bss->user_tgid = 0;
+
+	err = test_ns_current_pid_tgid__attach(skel);
+	if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
+		goto cleanup;
+
+	/* trigger tracepoint */
+	usleep(1);
+	ASSERT_EQ(bss->user_pid, pid, "pid");
+	ASSERT_EQ(bss->user_tgid, tgid, "tgid");
+	err = 0;
+
+cleanup:
+	 test_ns_current_pid_tgid__destroy(skel);
+
+	return err;
+}
+
+static void test_ns_current_pid_tgid_new_ns(void)
+{
+	int wstatus, duration = 0;
+	pid_t cpid;
+
+	/* Create a process in a new namespace, this process
+	 * will be the init process of this new namespace hence will be pid 1.
+	 */
+	cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE,
+		     CLONE_NEWPID | SIGCHLD, NULL);
+
+	if (CHECK(cpid == -1, "clone", "%s\n", strerror(errno)))
+		return;
+
+	if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", "%s\n", strerror(errno)))
+		return;
+
+	if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed"))
+		return;
+}
+
+/* TODO: use a different tracepoint */
+void serial_test_ns_current_pid_tgid(void)
+{
+	if (test__start_subtest("ns_current_pid_tgid_root_ns"))
+		test_current_pid_tgid(NULL);
+	if (test__start_subtest("ns_current_pid_tgid_new_ns"))
+		test_ns_current_pid_tgid_new_ns();
+}