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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: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210210033634.62081-10-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-02-09 19:36:34 -08:00 committed by Daniel Borkmann
parent 638e4b825d
commit 750e5d7649
1 changed files with 69 additions and 0 deletions
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69
tools/testing/selftests/bpf/progs/lsm.c
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@ -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;
}