cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

sample_map_ret0.c (679B)

      1/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
      2#include <linux/bpf.h>
      3#include <bpf/bpf_helpers.h>
      4
      5struct {
      6	__uint(type, BPF_MAP_TYPE_HASH);
      7	__type(key, __u32);
      8	__type(value, long);
      9	__uint(max_entries, 2);
     10} htab SEC(".maps");
     11
     12struct {
     13	__uint(type, BPF_MAP_TYPE_ARRAY);
     14	__type(key, __u32);
     15	__type(value, long);
     16	__uint(max_entries, 2);
     17} array SEC(".maps");
     18
     19/* Sample program which should always load for testing control paths. */
     20SEC(".text") int func()
     21{
     22	__u64 key64 = 0;
     23	__u32 key = 0;
     24	long *value;
     25
     26	value = bpf_map_lookup_elem(&htab, &key);
     27	if (!value)
     28		return 1;
     29	value = bpf_map_lookup_elem(&array, &key64);
     30	if (!value)
     31		return 1;
     32
     33	return 0;
     34}