cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

find_vma_fail2.c (587B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2021 Facebook */
      3#include "vmlinux.h"
      4#include <bpf/bpf_helpers.h>
      5
      6char _license[] SEC("license") = "GPL";
      7
      8struct callback_ctx {
      9	int dummy;
     10};
     11
     12static long write_task(struct task_struct *task, struct vm_area_struct *vma,
     13		       struct callback_ctx *data)
     14{
     15	/* writing to task, which is illegal */
     16	task->mm = NULL;
     17
     18	return 0;
     19}
     20
     21SEC("raw_tp/sys_enter")
     22int handle_getpid(void)
     23{
     24	struct task_struct *task = bpf_get_current_task_btf();
     25	struct callback_ctx data = {};
     26
     27	bpf_find_vma(task, 0, write_task, &data, 0);
     28	return 0;
     29}