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_ringbuf_multi.c (1562B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2020 Facebook
      3
      4#include <linux/bpf.h>
      5#include <bpf/bpf_helpers.h>
      6
      7char _license[] SEC("license") = "GPL";
      8
      9struct sample {
     10	int pid;
     11	int seq;
     12	long value;
     13	char comm[16];
     14};
     15
     16struct ringbuf_map {
     17	__uint(type, BPF_MAP_TYPE_RINGBUF);
     18	/* libbpf will adjust to valid page size */
     19	__uint(max_entries, 1000);
     20} ringbuf1 SEC(".maps"),
     21  ringbuf2 SEC(".maps");
     22
     23struct {
     24	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
     25	__uint(max_entries, 4);
     26	__type(key, int);
     27	__array(values, struct ringbuf_map);
     28} ringbuf_arr SEC(".maps") = {
     29	.values = {
     30		[0] = &ringbuf1,
     31		[2] = &ringbuf2,
     32	},
     33};
     34
     35struct {
     36	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
     37	__uint(max_entries, 1);
     38	__type(key, int);
     39	__array(values, struct ringbuf_map);
     40} ringbuf_hash SEC(".maps") = {
     41	.values = {
     42		[0] = &ringbuf1,
     43	},
     44};
     45
     46/* inputs */
     47int pid = 0;
     48int target_ring = 0;
     49long value = 0;
     50
     51/* outputs */
     52long total = 0;
     53long dropped = 0;
     54long skipped = 0;
     55
     56SEC("tp/syscalls/sys_enter_getpgid")
     57int test_ringbuf(void *ctx)
     58{
     59	int cur_pid = bpf_get_current_pid_tgid() >> 32;
     60	struct sample *sample;
     61	void *rb;
     62	int zero = 0;
     63
     64	if (cur_pid != pid)
     65		return 0;
     66
     67	rb = bpf_map_lookup_elem(&ringbuf_arr, &target_ring);
     68	if (!rb) {
     69		skipped += 1;
     70		return 1;
     71	}
     72
     73	sample = bpf_ringbuf_reserve(rb, sizeof(*sample), 0);
     74	if (!sample) {
     75		dropped += 1;
     76		return 1;
     77	}
     78
     79	sample->pid = pid;
     80	bpf_get_current_comm(sample->comm, sizeof(sample->comm));
     81	sample->value = value;
     82
     83	sample->seq = total;
     84	total += 1;
     85
     86	bpf_ringbuf_submit(sample, 0);
     87
     88	return 0;
     89}