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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get_cgroup_id_kern.c (806B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2018 Facebook
      3
      4#include <linux/bpf.h>
      5#include <bpf/bpf_helpers.h>
      6
      7struct {
      8	__uint(type, BPF_MAP_TYPE_ARRAY);
      9	__uint(max_entries, 1);
     10	__type(key, __u32);
     11	__type(value, __u64);
     12} cg_ids SEC(".maps");
     13
     14struct {
     15	__uint(type, BPF_MAP_TYPE_ARRAY);
     16	__uint(max_entries, 1);
     17	__type(key, __u32);
     18	__type(value, __u32);
     19} pidmap SEC(".maps");
     20
     21SEC("tracepoint/syscalls/sys_enter_nanosleep")
     22int trace(void *ctx)
     23{
     24	__u32 pid = bpf_get_current_pid_tgid();
     25	__u32 key = 0, *expected_pid;
     26	__u64 *val;
     27
     28	expected_pid = bpf_map_lookup_elem(&pidmap, &key);
     29	if (!expected_pid || *expected_pid != pid)
     30		return 0;
     31
     32	val = bpf_map_lookup_elem(&cg_ids, &key);
     33	if (val)
     34		*val = bpf_get_current_cgroup_id();
     35
     36	return 0;
     37}
     38
     39char _license[] SEC("license") = "GPL";