linux-stable/tools/testing/selftests/bpf/test_dev_cgroup.c
Andrii Nakryiko cbdb1461dc selftests/bpf: Use explicit bpf_prog_test_load() calls everywhere
-Dbpf_prog_load_deprecated=bpf_prog_test_load trick is both ugly and
breaks when deprecation goes into effect due to macro magic. Convert all
the uses to explicit bpf_prog_test_load() calls which avoid deprecation
errors and makes everything less magical.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/bpf/20211103220845.2676888-12-andrii@kernel.org
2021-11-07 08:34:23 -08:00

83 lines
2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
*/
#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 "testing_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_test_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE,
&obj, &prog_fd)) {
printf("Failed to load DEV_CGROUP program\n");
goto out;
}
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
if (cgroup_fd < 0) {
printf("Failed to create test cgroup\n");
goto out;
}
/* 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;
}