Commit 1022b67b authored by Rhys Rustad-Elliott's avatar Rhys Rustad-Elliott Committed by Martin KaFai Lau
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selftests/bpf: Add access_inner_map selftest 



Add a selftest that accesses a BPF_MAP_TYPE_ARRAY (at a nonzero index)
nested within a BPF_MAP_TYPE_HASH_OF_MAPS to flex a previously buggy
case.

Signed-off-by: default avatarRhys Rustad-Elliott <me@rhysre.net>
Link: https://lore.kernel.org/r/20230602190110.47068-3-me@rhysre.net


Signed-off-by: default avatarMartin KaFai Lau <martin.lau@kernel.org>
parent cba41bb7

tools/testing/selftests/bpf/prog_tests/inner_array_lookup.c

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+31 −0
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// SPDX-License-Identifier: GPL-2.0-only



#include <test_progs.h>



#include "inner_array_lookup.skel.h"



void test_inner_array_lookup(void)

{

	int map1_fd, err;

	int key = 3;

	int val = 1;

	struct inner_array_lookup *skel;



	skel = inner_array_lookup__open_and_load();

	if (!ASSERT_OK_PTR(skel, "open_load_skeleton"))

		return;



	err = inner_array_lookup__attach(skel);

	if (!ASSERT_OK(err, "skeleton_attach"))

		goto cleanup;



	map1_fd = bpf_map__fd(skel->maps.inner_map1);

	bpf_map_update_elem(map1_fd, &key, &val, 0);



	/* Probe should have set the element at index 3 to 2 */

	bpf_map_lookup_elem(map1_fd, &key, &val);

	ASSERT_EQ(val, 2, "value_is_2");



cleanup:

	inner_array_lookup__destroy(skel);

}

tools/testing/selftests/bpf/progs/inner_array_lookup.c

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// SPDX-License-Identifier: GPL-2.0-only



#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>



struct inner_map {

	__uint(type, BPF_MAP_TYPE_ARRAY);

	__uint(max_entries, 5);

	__type(key, int);

	__type(value, int);

} inner_map1 SEC(".maps");



struct outer_map {

	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);

	__uint(max_entries, 3);

	__type(key, int);

	__array(values, struct inner_map);

} outer_map1 SEC(".maps") = {

	.values = {

		[2] = &inner_map1,

	},

};



SEC("raw_tp/sys_enter")

int handle__sys_enter(void *ctx)

{

	int outer_key = 2, inner_key = 3;

	int *val;

	void *map;



	map = bpf_map_lookup_elem(&outer_map1, &outer_key);

	if (!map)

		return 1;



	val = bpf_map_lookup_elem(map, &inner_key);

	if (!val)

		return 1;



	if (*val == 1)

		*val = 2;



	return 0;

}



char _license[] SEC("license") = "GPL";