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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
/*
* Test that replacing an inner percpu array map with one that has different
* max_entries is rejected. percpu_array_map_gen_lookup() inlines the
* template's index_mask, so allowing a smaller replacement would cause OOB.
*/
void test_percpu_array_inner_map(void)
{
LIBBPF_OPTS(bpf_map_create_opts, opts);
int outer_fd, tmpl_fd, good_fd, bad_fd, err;
int zero = 0;
/* Create template: percpu array with 8 entries */
tmpl_fd = bpf_map_create(BPF_MAP_TYPE_PERCPU_ARRAY, "tmpl",
sizeof(int), sizeof(long), 8, NULL);
if (!ASSERT_OK_FD(tmpl_fd, "create_tmpl"))
return;
/* Create outer array-of-maps using template */
opts.inner_map_fd = tmpl_fd;
outer_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY_OF_MAPS, "outer",
sizeof(int), sizeof(int), 1, &opts);
if (!ASSERT_OK_FD(outer_fd, "create_outer"))
goto close_tmpl;
/* Insert template as initial inner map */
err = bpf_map_update_elem(outer_fd, &zero, &tmpl_fd, 0);
if (!ASSERT_OK(err, "insert_tmpl"))
goto close_outer;
/* Replacement with same max_entries should succeed */
good_fd = bpf_map_create(BPF_MAP_TYPE_PERCPU_ARRAY, "good",
sizeof(int), sizeof(long), 8, NULL);
if (!ASSERT_OK_FD(good_fd, "create_good"))
goto close_outer;
err = bpf_map_update_elem(outer_fd, &zero, &good_fd, 0);
ASSERT_OK(err, "replace_same_max_entries");
close(good_fd);
/* Replacement with fewer max_entries must fail */
bad_fd = bpf_map_create(BPF_MAP_TYPE_PERCPU_ARRAY, "bad",
sizeof(int), sizeof(long), 2, NULL);
if (!ASSERT_OK_FD(bad_fd, "create_bad"))
goto close_outer;
err = bpf_map_update_elem(outer_fd, &zero, &bad_fd, 0);
ASSERT_ERR(err, "replace_smaller_max_entries");
close(bad_fd);
close_outer:
close(outer_fd);
close_tmpl:
close(tmpl_fd);
}
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