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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include <network_helpers.h>
#include "map_kptr_race.skel.h"
static int get_map_id(int map_fd)
{
struct bpf_map_info info = {};
__u32 len = sizeof(info);
if (!ASSERT_OK(bpf_map_get_info_by_fd(map_fd, &info, &len), "get_map_info"))
return -1;
return info.id;
}
static int read_refs(struct map_kptr_race *skel)
{
LIBBPF_OPTS(bpf_test_run_opts, opts);
int ret;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.count_ref), &opts);
if (!ASSERT_OK(ret, "count_ref run"))
return -1;
if (!ASSERT_OK(opts.retval, "count_ref retval"))
return -1;
return skel->bss->num_of_refs;
}
static void test_htab_leak(void)
{
LIBBPF_OPTS(bpf_test_run_opts, opts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
struct map_kptr_race *skel, *watcher;
int ret, map_id;
skel = map_kptr_race__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
return;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_htab_leak), &opts);
if (!ASSERT_OK(ret, "test_htab_leak run"))
goto out_skel;
if (!ASSERT_OK(opts.retval, "test_htab_leak retval"))
goto out_skel;
map_id = get_map_id(bpf_map__fd(skel->maps.race_hash_map));
if (!ASSERT_GE(map_id, 0, "map_id"))
goto out_skel;
watcher = map_kptr_race__open_and_load();
if (!ASSERT_OK_PTR(watcher, "watcher open_and_load"))
goto out_skel;
watcher->bss->target_map_id = map_id;
watcher->links.map_put = bpf_program__attach(watcher->progs.map_put);
if (!ASSERT_OK_PTR(watcher->links.map_put, "attach fentry"))
goto out_watcher;
watcher->links.htab_map_free = bpf_program__attach(watcher->progs.htab_map_free);
if (!ASSERT_OK_PTR(watcher->links.htab_map_free, "attach fexit"))
goto out_watcher;
map_kptr_race__destroy(skel);
skel = NULL;
kern_sync_rcu();
while (!READ_ONCE(watcher->bss->map_freed))
sched_yield();
ASSERT_EQ(watcher->bss->map_freed, 1, "map_freed");
ASSERT_EQ(read_refs(watcher), 2, "htab refcount");
out_watcher:
map_kptr_race__destroy(watcher);
out_skel:
map_kptr_race__destroy(skel);
}
static void test_percpu_htab_leak(void)
{
LIBBPF_OPTS(bpf_test_run_opts, opts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
struct map_kptr_race *skel, *watcher;
int ret, map_id;
skel = map_kptr_race__open();
if (!ASSERT_OK_PTR(skel, "open"))
return;
skel->rodata->nr_cpus = libbpf_num_possible_cpus();
if (skel->rodata->nr_cpus > 16)
skel->rodata->nr_cpus = 16;
ret = map_kptr_race__load(skel);
if (!ASSERT_OK(ret, "load"))
goto out_skel;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_percpu_htab_leak), &opts);
if (!ASSERT_OK(ret, "test_percpu_htab_leak run"))
goto out_skel;
if (!ASSERT_OK(opts.retval, "test_percpu_htab_leak retval"))
goto out_skel;
map_id = get_map_id(bpf_map__fd(skel->maps.race_percpu_hash_map));
if (!ASSERT_GE(map_id, 0, "map_id"))
goto out_skel;
watcher = map_kptr_race__open_and_load();
if (!ASSERT_OK_PTR(watcher, "watcher open_and_load"))
goto out_skel;
watcher->bss->target_map_id = map_id;
watcher->links.map_put = bpf_program__attach(watcher->progs.map_put);
if (!ASSERT_OK_PTR(watcher->links.map_put, "attach fentry"))
goto out_watcher;
watcher->links.htab_map_free = bpf_program__attach(watcher->progs.htab_map_free);
if (!ASSERT_OK_PTR(watcher->links.htab_map_free, "attach fexit"))
goto out_watcher;
map_kptr_race__destroy(skel);
skel = NULL;
kern_sync_rcu();
while (!READ_ONCE(watcher->bss->map_freed))
sched_yield();
ASSERT_EQ(watcher->bss->map_freed, 1, "map_freed");
ASSERT_EQ(read_refs(watcher), 2, "percpu_htab refcount");
out_watcher:
map_kptr_race__destroy(watcher);
out_skel:
map_kptr_race__destroy(skel);
}
static void test_sk_ls_leak(void)
{
struct map_kptr_race *skel, *watcher;
int listen_fd = -1, client_fd = -1, map_id;
skel = map_kptr_race__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
return;
if (!ASSERT_OK(map_kptr_race__attach(skel), "attach"))
goto out_skel;
listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
if (!ASSERT_GE(listen_fd, 0, "start_server"))
goto out_skel;
client_fd = connect_to_fd(listen_fd, 0);
if (!ASSERT_GE(client_fd, 0, "connect_to_fd"))
goto out_skel;
if (!ASSERT_EQ(skel->bss->sk_ls_leak_done, 1, "sk_ls_leak_done"))
goto out_skel;
close(client_fd);
client_fd = -1;
close(listen_fd);
listen_fd = -1;
map_id = get_map_id(bpf_map__fd(skel->maps.race_sk_ls_map));
if (!ASSERT_GE(map_id, 0, "map_id"))
goto out_skel;
watcher = map_kptr_race__open_and_load();
if (!ASSERT_OK_PTR(watcher, "watcher open_and_load"))
goto out_skel;
watcher->bss->target_map_id = map_id;
watcher->links.map_put = bpf_program__attach(watcher->progs.map_put);
if (!ASSERT_OK_PTR(watcher->links.map_put, "attach fentry"))
goto out_watcher;
watcher->links.sk_map_free = bpf_program__attach(watcher->progs.sk_map_free);
if (!ASSERT_OK_PTR(watcher->links.sk_map_free, "attach fexit"))
goto out_watcher;
map_kptr_race__destroy(skel);
skel = NULL;
kern_sync_rcu();
while (!READ_ONCE(watcher->bss->map_freed))
sched_yield();
ASSERT_EQ(watcher->bss->map_freed, 1, "map_freed");
ASSERT_EQ(read_refs(watcher), 2, "sk_ls refcount");
out_watcher:
map_kptr_race__destroy(watcher);
out_skel:
if (client_fd >= 0)
close(client_fd);
if (listen_fd >= 0)
close(listen_fd);
map_kptr_race__destroy(skel);
}
void serial_test_map_kptr_race(void)
{
if (test__start_subtest("htab_leak"))
test_htab_leak();
if (test__start_subtest("percpu_htab_leak"))
test_percpu_htab_leak();
if (test__start_subtest("sk_ls_leak"))
test_sk_ls_leak();
}
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