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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timer_mim_reject.c (1671B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2021 Facebook */
      3#include <linux/bpf.h>
      4#include <time.h>
      5#include <errno.h>
      6#include <bpf/bpf_helpers.h>
      7#include "bpf_tcp_helpers.h"
      8
      9char _license[] SEC("license") = "GPL";
     10struct hmap_elem {
     11	int pad; /* unused */
     12	struct bpf_timer timer;
     13};
     14
     15struct inner_map {
     16	__uint(type, BPF_MAP_TYPE_HASH);
     17	__uint(max_entries, 1024);
     18	__type(key, int);
     19	__type(value, struct hmap_elem);
     20} inner_htab SEC(".maps");
     21
     22#define ARRAY_KEY 1
     23#define ARRAY_KEY2 2
     24#define HASH_KEY 1234
     25
     26struct outer_arr {
     27	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
     28	__uint(max_entries, 2);
     29	__uint(key_size, sizeof(int));
     30	__uint(value_size, sizeof(int));
     31	__array(values, struct inner_map);
     32} outer_arr SEC(".maps") = {
     33	.values = { [ARRAY_KEY] = &inner_htab },
     34};
     35
     36__u64 err;
     37__u64 ok;
     38__u64 cnt;
     39
     40/* callback for inner hash map */
     41static int timer_cb(void *map, int *key, struct hmap_elem *val)
     42{
     43	return 0;
     44}
     45
     46SEC("fentry/bpf_fentry_test1")
     47int BPF_PROG(test1, int a)
     48{
     49	struct hmap_elem init = {};
     50	struct bpf_map *inner_map, *inner_map2;
     51	struct hmap_elem *val;
     52	int array_key = ARRAY_KEY;
     53	int array_key2 = ARRAY_KEY2;
     54	int hash_key = HASH_KEY;
     55
     56	inner_map = bpf_map_lookup_elem(&outer_arr, &array_key);
     57	if (!inner_map)
     58		return 0;
     59
     60	inner_map2 = bpf_map_lookup_elem(&outer_arr, &array_key2);
     61	if (!inner_map2)
     62		return 0;
     63	bpf_map_update_elem(inner_map, &hash_key, &init, 0);
     64	val = bpf_map_lookup_elem(inner_map, &hash_key);
     65	if (!val)
     66		return 0;
     67
     68	bpf_timer_init(&val->timer, inner_map2, CLOCK_MONOTONIC);
     69	if (bpf_timer_set_callback(&val->timer, timer_cb))
     70		err |= 4;
     71	if (bpf_timer_start(&val->timer, 0, 0))
     72		err |= 8;
     73	return 0;
     74}