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linux-stable-mirror/tools/testing/selftests/bpf/prog_tests/map_kptr.c
T
Kumar Kartikeya DwivediandAlexei Starovoitov 2e7c6cb4d8 selftests/bpf: Exercise kptr map update lifetime 
Add focused map_kptr coverage for BPF-side map updates that touch values
containing referenced kptrs.

The new syscall programs stash the testmod refcounted object in an array
map, a preallocated hash map, and a no-prealloc hash map, then update the
same map from BPF. The refcount must remain elevated after the update,
while the userspace runner destroys the skeleton and reuses the existing
refcount wait to confirm map teardown releases the kptr.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260609202548.3571690-5-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-06-09 21:23:11 -07:00

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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
#include "map_kptr.skel.h"
#include "map_kptr_fail.skel.h"
#include "rcu_tasks_trace_gp.skel.h"
static void test_map_kptr_success(bool test_run)
{
LIBBPF_OPTS(bpf_test_run_opts, lopts);
LIBBPF_OPTS(bpf_test_run_opts, opts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
int key = 0, ret, cpu;
struct map_kptr *skel;
char buf[16], *pbuf;
skel = map_kptr__open_and_load();
if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
return;
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref1), &opts);
ASSERT_OK(ret, "test_map_kptr_ref1 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref1 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref2), &opts);
ASSERT_OK(ret, "test_map_kptr_ref2 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref2 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_ls_map_kptr_ref1), &lopts);
ASSERT_OK(ret, "test_ls_map_kptr_ref1 refcount");
ASSERT_OK(lopts.retval, "test_ls_map_kptr_ref1 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_ls_map_kptr_ref2), &lopts);
ASSERT_OK(ret, "test_ls_map_kptr_ref2 refcount");
ASSERT_OK(lopts.retval, "test_ls_map_kptr_ref2 retval");
if (test_run)
goto exit;
cpu = libbpf_num_possible_cpus();
if (!ASSERT_GT(cpu, 0, "libbpf_num_possible_cpus"))
goto exit;
pbuf = calloc(cpu, sizeof(buf));
if (!ASSERT_OK_PTR(pbuf, "calloc(pbuf)"))
goto exit;
ret = bpf_map__update_elem(skel->maps.array_map,
&key, sizeof(key), buf, sizeof(buf), 0);
ASSERT_OK(ret, "array_map update");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__update_elem(skel->maps.pcpu_array_map,
&key, sizeof(key), pbuf, cpu * sizeof(buf), 0);
ASSERT_OK(ret, "pcpu_array_map update");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "hash_map delete");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.pcpu_hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "pcpu_hash_map delete");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.hash_malloc_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "hash_malloc_map delete");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.pcpu_hash_malloc_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "pcpu_hash_malloc_map delete");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.lru_hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "lru_hash_map delete");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_map__delete_elem(skel->maps.lru_pcpu_hash_map, &key, sizeof(key), 0);
ASSERT_OK(ret, "lru_pcpu_hash_map delete");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref3), &opts);
ASSERT_OK(ret, "test_map_kptr_ref3 refcount");
ASSERT_OK(opts.retval, "test_map_kptr_ref3 retval");
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_ls_map_kptr_ref_del), &lopts);
ASSERT_OK(ret, "test_ls_map_kptr_ref_del delete");
skel->data->ref--;
ASSERT_OK(lopts.retval, "test_ls_map_kptr_ref_del retval");
free(pbuf);
exit:
map_kptr__destroy(skel);
}
static int kern_sync_rcu_tasks_trace(struct rcu_tasks_trace_gp *rcu)
{
LIBBPF_OPTS(bpf_test_run_opts, opts);
int ret;
WRITE_ONCE(rcu->bss->done, 0);
ret = bpf_prog_test_run_opts(bpf_program__fd(rcu->progs.call_rcu_tasks_trace), &opts);
if (!ASSERT_OK(ret, "call_rcu_tasks_trace"))
return -EFAULT;
if (!ASSERT_OK(opts.retval, "call_rcu_tasks_trace retval"))
return -EFAULT;
while (!READ_ONCE(rcu->bss->done))
sched_yield();
return 0;
}
static void wait_for_map_release(void)
{
LIBBPF_OPTS(bpf_test_run_opts, lopts);
struct map_kptr *skel;
int ret;
skel = map_kptr__open_and_load();
if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
return;
do {
ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.count_ref), &lopts);
ASSERT_OK(ret, "count_ref ret");
ASSERT_OK(lopts.retval, "count_ref retval");
} while (skel->bss->num_of_refs != 2);
map_kptr__destroy(skel);
}
enum map_update_kptr_case {
MAP_UPDATE_KPTR_ARRAY,
MAP_UPDATE_KPTR_HASH,
MAP_UPDATE_KPTR_HASH_MALLOC,
};
static struct bpf_program *map_update_kptr_prog(struct map_kptr *skel,
enum map_update_kptr_case test)
{
switch (test) {
case MAP_UPDATE_KPTR_ARRAY:
return skel->progs.test_array_map_update_kptr;
case MAP_UPDATE_KPTR_HASH:
return skel->progs.test_hash_map_update_kptr;
case MAP_UPDATE_KPTR_HASH_MALLOC:
return skel->progs.test_hash_malloc_map_update_kptr;
}
return NULL;
}
static void test_map_update_kptr(enum map_update_kptr_case test)
{
LIBBPF_OPTS(bpf_test_run_opts, opts);
struct map_kptr *skel;
struct bpf_program *prog;
int ret;
skel = map_kptr__open_and_load();
if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load"))
return;
prog = map_update_kptr_prog(skel, test);
if (!ASSERT_OK_PTR(prog, "map_update_kptr_prog"))
goto out;
ret = bpf_prog_test_run_opts(bpf_program__fd(prog), &opts);
if (!ASSERT_OK(ret, "map_update_kptr"))
goto out;
if (!ASSERT_OK(opts.retval, "map_update_kptr retval"))
goto out;
ASSERT_EQ(skel->bss->num_of_refs, 3, "refs_after_update");
out:
map_kptr__destroy(skel);
wait_for_map_release();
}
void serial_test_map_kptr(void)
{
struct rcu_tasks_trace_gp *skel;
RUN_TESTS(map_kptr_fail);
if (test__start_subtest("update_array_map_kptr"))
test_map_update_kptr(MAP_UPDATE_KPTR_ARRAY);
if (test__start_subtest("update_hash_map_kptr"))
test_map_update_kptr(MAP_UPDATE_KPTR_HASH);
if (test__start_subtest("update_hash_malloc_map_kptr"))
test_map_update_kptr(MAP_UPDATE_KPTR_HASH_MALLOC);
skel = rcu_tasks_trace_gp__open_and_load();
if (!ASSERT_OK_PTR(skel, "rcu_tasks_trace_gp__open_and_load"))
return;
if (test__start_subtest("success-map")) {
test_map_kptr_success(true);
ASSERT_OK(kern_sync_rcu_tasks_trace(skel), "sync rcu_tasks_trace");
ASSERT_OK(kern_sync_rcu(), "sync rcu");
wait_for_map_release();
/* Observe refcount dropping to 1 on bpf_map_free_deferred */
test_map_kptr_success(false);
ASSERT_OK(kern_sync_rcu_tasks_trace(skel), "sync rcu_tasks_trace");
ASSERT_OK(kern_sync_rcu(), "sync rcu");
wait_for_map_release();
/* Observe refcount dropping to 1 on map release. */
test_map_kptr_success(true);
}
rcu_tasks_trace_gp__destroy(skel);
}
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