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_prog_array_init.c (693B)

      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
      8const volatile pid_t my_pid = 0;
      9int value = 0;
     10
     11SEC("raw_tp/sys_enter")
     12int tailcall_1(void *ctx)
     13{
     14	value = 42;
     15	return 0;
     16}
     17
     18struct {
     19	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
     20	__uint(max_entries, 2);
     21	__uint(key_size, sizeof(__u32));
     22	__array(values, int (void *));
     23} prog_array_init SEC(".maps") = {
     24	.values = {
     25		[1] = (void *)&tailcall_1,
     26	},
     27};
     28
     29SEC("raw_tp/sys_enter")
     30int entry(void *ctx)
     31{
     32	pid_t pid = bpf_get_current_pid_tgid() >> 32;
     33
     34	if (pid != my_pid)
     35		return 0;
     36
     37	bpf_tail_call(ctx, &prog_array_init, 1);
     38	return 0;
     39}