Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/samples/bpf/test_current_task_under_cgroup_user.c b/samples/bpf/test_current_task_under_cgroup_user.c
new file mode 100644
index 000000000..4be4874ca
--- /dev/null
+++ b/samples/bpf/test_current_task_under_cgroup_user.c
@@ -0,0 +1,85 @@
+/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <linux/bpf.h>
+#include <unistd.h>
+#include <bpf/bpf.h>
+#include "bpf_load.h"
+#include <linux/bpf.h>
+#include "cgroup_helpers.h"
+
+#define CGROUP_PATH		"/my-cgroup"
+
+int main(int argc, char **argv)
+{
+	pid_t remote_pid, local_pid = getpid();
+	int cg2, idx = 0, rc = 0;
+	char filename[256];
+
+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+	if (load_bpf_file(filename)) {
+		printf("%s", bpf_log_buf);
+		return 1;
+	}
+
+	if (setup_cgroup_environment())
+		goto err;
+
+	cg2 = create_and_get_cgroup(CGROUP_PATH);
+
+	if (!cg2)
+		goto err;
+
+	if (bpf_map_update_elem(map_fd[0], &idx, &cg2, BPF_ANY)) {
+		log_err("Adding target cgroup to map");
+		goto err;
+	}
+
+	if (join_cgroup(CGROUP_PATH))
+		goto err;
+
+	/*
+	 * The installed helper program catched the sync call, and should
+	 * write it to the map.
+	 */
+
+	sync();
+	bpf_map_lookup_elem(map_fd[1], &idx, &remote_pid);
+
+	if (local_pid != remote_pid) {
+		fprintf(stderr,
+			"BPF Helper didn't write correct PID to map, but: %d\n",
+			remote_pid);
+		goto err;
+	}
+
+	/* Verify the negative scenario; leave the cgroup */
+	if (join_cgroup("/"))
+		goto err;
+
+	remote_pid = 0;
+	bpf_map_update_elem(map_fd[1], &idx, &remote_pid, BPF_ANY);
+
+	sync();
+	bpf_map_lookup_elem(map_fd[1], &idx, &remote_pid);
+
+	if (local_pid == remote_pid) {
+		fprintf(stderr, "BPF cgroup negative test did not work\n");
+		goto err;
+	}
+
+	goto out;
+err:
+	rc = 1;
+
+out:
+	close(cg2);
+	cleanup_cgroup_environment();
+	return rc;
+}