tools/testing/selftests/bpf/progs/bpf_iter_test_kern5.c

   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 }