Release 4.18 tools/testing/selftests/bpf/test_dev_cgroup.c

/* Copyright (c) 2017 Facebook
 *
 * 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/time.h>

#include <linux/bpf.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>

#include "cgroup_helpers.h"
#include "bpf_rlimit.h"


#define DEV_CGROUP_PROG "./dev_cgroup.o"


#define TEST_CGROUP "/test-bpf-based-device-cgroup/"



int main(int argc, char **argv)
{
	struct bpf_object *obj;
	int error = EXIT_FAILURE;
	int prog_fd, cgroup_fd;
	__u32 prog_cnt;

	if (bpf_prog_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE,
			  &obj, &prog_fd)) {
		printf("Failed to load DEV_CGROUP program\n");
		goto out;
	}

	if (setup_cgroup_environment()) {
		printf("Failed to load DEV_CGROUP program\n");
		goto err;
	}

	/* Create a cgroup, get fd, and join it */
	cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
	if (!cgroup_fd) {
		printf("Failed to create test cgroup\n");
		goto err;
	}

	if (join_cgroup(TEST_CGROUP)) {
		printf("Failed to join cgroup\n");
		goto err;
	}

	/* Attach bpf program */
	if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_DEVICE, 0)) {
		printf("Failed to attach DEV_CGROUP program");
		goto err;
	}

	if (bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL,
			   &prog_cnt)) {
		printf("Failed to query attached programs");
		goto err;
	}

	/* All operations with /dev/zero and and /dev/urandom are allowed,
         * everything else is forbidden.
         */
	assert(system("rm -f /tmp/test_dev_cgroup_null") == 0);
	assert(system("mknod /tmp/test_dev_cgroup_null c 1 3"));
	assert(system("rm -f /tmp/test_dev_cgroup_null") == 0);

	/* /dev/zero is whitelisted */
	assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0);
	assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5") == 0);
	assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0);

	assert(system("dd if=/dev/urandom of=/dev/zero count=64") == 0);

	/* src is allowed, target is forbidden */
	assert(system("dd if=/dev/urandom of=/dev/full count=64"));

	/* src is forbidden, target is allowed */
	assert(system("dd if=/dev/random of=/dev/zero count=64"));

	error = 0;
	printf("test_dev_cgroup:PASS\n");

err:
	cleanup_cgroup_environment();

out:
	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Roman Gushchin
267
98.89%
1
50.00%
Yonghong Song
3
1.11%
1
50.00%
Total
270
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Roman Gushchin
298
95.51%
1
25.00%
Yonghong Song
8
2.56%
1
25.00%
Daniel Borkmann
5
1.60%
1
25.00%
Alexei Starovoitov
1
0.32%
1
25.00%
Total
312
100.00%
4
100.00%
Directory: tools/testing/selftests/bpf

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