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_pe_preserve_elems.c (841B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2020 Facebook
      3#include <linux/bpf.h>
      4#include <bpf/bpf_helpers.h>
      5#include <bpf/bpf_tracing.h>
      6
      7struct {
      8	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
      9	__uint(max_entries, 1);
     10	__type(key, int);
     11	__type(value, int);
     12} array_1 SEC(".maps");
     13
     14struct {
     15	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
     16	__uint(max_entries, 1);
     17	__type(key, int);
     18	__type(value, int);
     19	__uint(map_flags, BPF_F_PRESERVE_ELEMS);
     20} array_2 SEC(".maps");
     21
     22SEC("raw_tp/sched_switch")
     23int BPF_PROG(read_array_1)
     24{
     25	struct bpf_perf_event_value val;
     26
     27	return bpf_perf_event_read_value(&array_1, 0, &val, sizeof(val));
     28}
     29
     30SEC("raw_tp/task_rename")
     31int BPF_PROG(read_array_2)
     32{
     33	struct bpf_perf_event_value val;
     34
     35	return bpf_perf_event_read_value(&array_2, 0, &val, sizeof(val));
     36}
     37
     38char LICENSE[] SEC("license") = "GPL";