Commit 750e5d76 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by Daniel Borkmann
Browse files

selftests/bpf: Add a test for map-in-map and per-cpu maps in sleepable progs 



Add a basic test for map-in-map and per-cpu maps in sleepable programs.

Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarKP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210210033634.62081-10-alexei.starovoitov@gmail.com
parent 638e4b82

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

+69 −0
Original line number Diff line number Diff line
@@ -30,6 +30,53 @@ struct { 
	__type(value, __u64);

} lru_hash SEC(".maps");



struct {

	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);

	__uint(max_entries, 1);

	__type(key, __u32);

	__type(value, __u64);

} percpu_array SEC(".maps");



struct {

	__uint(type, BPF_MAP_TYPE_PERCPU_HASH);

	__uint(max_entries, 1);

	__type(key, __u32);

	__type(value, __u64);

} percpu_hash SEC(".maps");



struct {

	__uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH);

	__uint(max_entries, 1);

	__type(key, __u32);

	__type(value, __u64);

} lru_percpu_hash SEC(".maps");



struct inner_map {

	__uint(type, BPF_MAP_TYPE_ARRAY);

	__uint(max_entries, 1);

	__type(key, int);

	__type(value, __u64);

} inner_map SEC(".maps");



struct outer_arr {

	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);

	__uint(max_entries, 1);

	__uint(key_size, sizeof(int));

	__uint(value_size, sizeof(int));

	__array(values, struct inner_map);

} outer_arr SEC(".maps") = {

	.values = { [0] = &inner_map },

};



struct outer_hash {

	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);

	__uint(max_entries, 1);

	__uint(key_size, sizeof(int));

	__array(values, struct inner_map);

} outer_hash SEC(".maps") = {

	.values = { [0] = &inner_map },

};



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



int monitored_pid = 0;
@@ -61,6 +108,7 @@ SEC("lsm.s/bprm_committed_creds") 
int BPF_PROG(test_void_hook, struct linux_binprm *bprm)

{

	__u32 pid = bpf_get_current_pid_tgid() >> 32;

	struct inner_map *inner_map;

	char args[64];

	__u32 key = 0;

	__u64 *value;
@@ -80,6 +128,27 @@ int BPF_PROG(test_void_hook, struct linux_binprm *bprm) 
	value = bpf_map_lookup_elem(&lru_hash, &key);

	if (value)

		*value = 0;

	value = bpf_map_lookup_elem(&percpu_array, &key);

	if (value)

		*value = 0;

	value = bpf_map_lookup_elem(&percpu_hash, &key);

	if (value)

		*value = 0;

	value = bpf_map_lookup_elem(&lru_percpu_hash, &key);

	if (value)

		*value = 0;

	inner_map = bpf_map_lookup_elem(&outer_arr, &key);

	if (inner_map) {

		value = bpf_map_lookup_elem(inner_map, &key);

		if (value)

			*value = 0;

	}

	inner_map = bpf_map_lookup_elem(&outer_hash, &key);

	if (inner_map) {

		value = bpf_map_lookup_elem(inner_map, &key);

		if (value)

			*value = 0;

	}



	return 0;

}