1// SPDX-License-Identifier: GPL-2.0 2/* Copyright (c) 2021 Facebook */ 3#include "vmlinux.h" 4#include <bpf/bpf_helpers.h> 5#define vm_flags vm_start 6 7char _license[] SEC("license") = "GPL"; 8 9struct callback_ctx { 10 int dummy; 11}; 12 13static long write_vma(struct task_struct *task, struct vm_area_struct *vma, 14 struct callback_ctx *data) 15{ 16 /* writing to vma, which is illegal */ 17 vma->vm_start = 0xffffffffff600000; 18 19 return 0; 20} 21 22SEC("raw_tp/sys_enter") 23int handle_getpid(void) 24{ 25 struct task_struct *task = bpf_get_current_task_btf(); 26 struct callback_ctx data = {}; 27 28 bpf_find_vma(task, 0, write_vma, &data, 0); 29 return 0; 30} 31