cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_map_in_map.c (1016B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2018 Facebook */
      3#include <stddef.h>
      4#include <linux/bpf.h>
      5#include <linux/types.h>
      6#include <bpf/bpf_helpers.h>
      7
      8struct {
      9	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
     10	__uint(max_entries, 1);
     11	__uint(map_flags, 0);
     12	__type(key, __u32);
     13	__type(value, __u32);
     14} mim_array SEC(".maps");
     15
     16struct {
     17	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
     18	__uint(max_entries, 1);
     19	__uint(map_flags, 0);
     20	__type(key, int);
     21	__type(value, __u32);
     22} mim_hash SEC(".maps");
     23
     24SEC("xdp")
     25int xdp_mimtest0(struct xdp_md *ctx)
     26{
     27	int value = 123;
     28	int *value_p;
     29	int key = 0;
     30	void *map;
     31
     32	map = bpf_map_lookup_elem(&mim_array, &key);
     33	if (!map)
     34		return XDP_DROP;
     35
     36	bpf_map_update_elem(map, &key, &value, 0);
     37	value_p = bpf_map_lookup_elem(map, &key);
     38	if (!value_p || *value_p != 123)
     39		return XDP_DROP;
     40
     41	map = bpf_map_lookup_elem(&mim_hash, &key);
     42	if (!map)
     43		return XDP_DROP;
     44
     45	bpf_map_update_elem(map, &key, &value, 0);
     46
     47	return XDP_PASS;
     48}
     49
     50char _license[] SEC("license") = "GPL";