LXR linux/tools/testing/selftests/bpf/progs/bpf_iter_test

   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
   7char _license[] SEC("license") = "GPL";
   8
   9struct key_t {
  10        int a;
  11        int b;
  12        int c;
  13};
  14
  15struct {
  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
  24SEC("iter/bpf_map_elem")
  25int 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