forked from Minki/linux
25763b3c86
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 107 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
#include <stdio.h>
|
|
#include <linux/bpf.h>
|
|
#include <unistd.h>
|
|
#include <bpf/bpf.h>
|
|
#include "bpf_load.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 < 0)
|
|
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;
|
|
}
|