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_skc_to_unix_sock.c (835B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* Copyright (c) 2021 Hengqi Chen */
      3
      4#include "vmlinux.h"
      5#include <bpf/bpf_helpers.h>
      6#include <bpf/bpf_tracing.h>
      7#include "bpf_tracing_net.h"
      8
      9const volatile pid_t my_pid = 0;
     10char path[256] = {};
     11
     12SEC("fentry/unix_listen")
     13int BPF_PROG(unix_listen, struct socket *sock, int backlog)
     14{
     15	pid_t pid = bpf_get_current_pid_tgid() >> 32;
     16	struct unix_sock *unix_sk;
     17	int i, len;
     18
     19	if (pid != my_pid)
     20		return 0;
     21
     22	unix_sk = (struct unix_sock *)bpf_skc_to_unix_sock(sock->sk);
     23	if (!unix_sk)
     24		return 0;
     25
     26	if (unix_sk->addr->name->sun_path[0])
     27		return 0;
     28
     29	len = unix_sk->addr->len - sizeof(short);
     30	path[0] = '@';
     31	for (i = 1; i < len; i++) {
     32		if (i >= sizeof(struct sockaddr_un))
     33			break;
     34
     35		path[i] = unix_sk->addr->name->sun_path[i];
     36	}
     37	return 0;
     38}
     39
     40char _license[] SEC("license") = "GPL";