1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include "bpf_iter.h"
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_tracing.h>
6 
7 char _license[] SEC("license") = "GPL";
8 
9 struct key_t {
10 	int a;
11 	int b;
12 	int c;
13 };
14 
15 struct {
16 	__uint(type, BPF_MAP_TYPE_HASH);
17 	__uint(max_entries, 3);
18 	__type(key, struct key_t);
19 	__type(value, __u64);
20 } hashmap1 SEC(".maps");
21 
22 __u32 key_sum = 0;
23 
24 SEC("iter/bpf_map_elem")
25 int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx)
26 {
27 	void *key = ctx->key;
28 
29 	if (key == (void *)0)
30 		return 0;
31 
32 	/* out of bound access w.r.t. hashmap1 */
33 	key_sum += *(__u32 *)(key + sizeof(struct key_t));
34 	return 0;
35 }
36