refcounted_kptr.c

  1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
  3
  4#include <test_progs.h>
  5#include <network_helpers.h>
  6
  7#include "refcounted_kptr.skel.h"
  8#include "refcounted_kptr_fail.skel.h"
  9
 10void test_refcounted_kptr(void)
 11{
 12	RUN_TESTS(refcounted_kptr);
 13}
 14
 15void test_refcounted_kptr_fail(void)
 16{
 17	RUN_TESTS(refcounted_kptr_fail);
 18}
 19
 20void test_refcounted_kptr_wrong_owner(void)
 21{
 22	LIBBPF_OPTS(bpf_test_run_opts, opts,
 23		    .data_in = &pkt_v4,
 24		    .data_size_in = sizeof(pkt_v4),
 25		    .repeat = 1,
 26	);
 27	struct refcounted_kptr *skel;
 28	int ret;
 29
 30	skel = refcounted_kptr__open_and_load();
 31	if (!ASSERT_OK_PTR(skel, "refcounted_kptr__open_and_load"))
 32		return;
 33
 34	ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.rbtree_wrong_owner_remove_fail_a1), &opts);
 35	ASSERT_OK(ret, "rbtree_wrong_owner_remove_fail_a1");
 36	ASSERT_OK(opts.retval, "rbtree_wrong_owner_remove_fail_a1 retval");
 37
 38	ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.rbtree_wrong_owner_remove_fail_b), &opts);
 39	ASSERT_OK(ret, "rbtree_wrong_owner_remove_fail_b");
 40	ASSERT_OK(opts.retval, "rbtree_wrong_owner_remove_fail_b retval");
 41
 42	ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.rbtree_wrong_owner_remove_fail_a2), &opts);
 43	ASSERT_OK(ret, "rbtree_wrong_owner_remove_fail_a2");
 44	ASSERT_OK(opts.retval, "rbtree_wrong_owner_remove_fail_a2 retval");
 45	refcounted_kptr__destroy(skel);
 46}
 47
 48void test_percpu_hash_refcounted_kptr_refcount_leak(void)
 49{
 50	struct refcounted_kptr *skel;
 51	int cpu_nr, fd, err, key = 0;
 52	struct bpf_map *map;
 53	size_t values_sz;
 54	u64 *values;
 55	LIBBPF_OPTS(bpf_test_run_opts, opts,
 56		    .data_in = &pkt_v4,
 57		    .data_size_in = sizeof(pkt_v4),
 58		    .repeat = 1,
 59	);
 60
 61	cpu_nr = libbpf_num_possible_cpus();
 62	if (!ASSERT_GT(cpu_nr, 0, "libbpf_num_possible_cpus"))
 63		return;
 64
 65	values = calloc(cpu_nr, sizeof(u64));
 66	if (!ASSERT_OK_PTR(values, "calloc values"))
 67		return;
 68
 69	skel = refcounted_kptr__open_and_load();
 70	if (!ASSERT_OK_PTR(skel, "refcounted_kptr__open_and_load")) {
 71		free(values);
 72		return;
 73	}
 74
 75	values_sz = cpu_nr * sizeof(u64);
 76	memset(values, 0, values_sz);
 77
 78	map = skel->maps.percpu_hash;
 79	err = bpf_map__update_elem(map, &key, sizeof(key), values, values_sz, 0);
 80	if (!ASSERT_OK(err, "bpf_map__update_elem"))
 81		goto out;
 82
 83	fd = bpf_program__fd(skel->progs.percpu_hash_refcount_leak);
 84	err = bpf_prog_test_run_opts(fd, &opts);
 85	if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
 86		goto out;
 87	if (!ASSERT_EQ(opts.retval, 2, "opts.retval"))
 88		goto out;
 89
 90	err = bpf_map__update_elem(map, &key, sizeof(key), values, values_sz, 0);
 91	if (!ASSERT_OK(err, "bpf_map__update_elem"))
 92		goto out;
 93
 94	fd = bpf_program__fd(skel->progs.check_percpu_hash_refcount);
 95	err = bpf_prog_test_run_opts(fd, &opts);
 96	ASSERT_OK(err, "bpf_prog_test_run_opts");
 97	ASSERT_EQ(opts.retval, 1, "opts.retval");
 98
 99out:
100	refcounted_kptr__destroy(skel);
101	free(values);
102}