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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task_local_storage_exit_creds.c (712B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2021 Facebook */
      3
      4#include "vmlinux.h"
      5#include <bpf/bpf_helpers.h>
      6#include <bpf/bpf_tracing.h>
      7
      8char _license[] SEC("license") = "GPL";
      9
     10struct {
     11	__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
     12	__uint(map_flags, BPF_F_NO_PREALLOC);
     13	__type(key, int);
     14	__type(value, __u64);
     15} task_storage SEC(".maps");
     16
     17int valid_ptr_count = 0;
     18int null_ptr_count = 0;
     19
     20SEC("fentry/exit_creds")
     21int BPF_PROG(trace_exit_creds, struct task_struct *task)
     22{
     23	__u64 *ptr;
     24
     25	ptr = bpf_task_storage_get(&task_storage, task, 0,
     26				   BPF_LOCAL_STORAGE_GET_F_CREATE);
     27	if (ptr)
     28		__sync_fetch_and_add(&valid_ptr_count, 1);
     29	else
     30		__sync_fetch_and_add(&null_ptr_count, 1);
     31	return 0;
     32}