tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
3
4#include "vmlinux.h"
5#include "bpf_experimental.h"
6#include <bpf/bpf_helpers.h>
7#include "bpf_misc.h"
8
9pid_t target_pid = 0;
10unsigned int vmas_seen = 0;
11
12struct {
13 __u64 vm_start;
14 __u64 vm_end;
15} vm_ranges[1000];
16
17SEC("raw_tp/sys_enter")
18int iter_task_vma_for_each(const void *ctx)
19{
20 struct task_struct *task = bpf_get_current_task_btf();
21 struct vm_area_struct *vma;
22 unsigned int seen = 0;
23
24 if (task->pid != target_pid)
25 return 0;
26
27 if (vmas_seen)
28 return 0;
29
30 bpf_for_each(task_vma, vma, task, 0) {
31 if (seen >= 1000)
32 break;
33 barrier_var(seen);
34
35 vm_ranges[seen].vm_start = vma->vm_start;
36 vm_ranges[seen].vm_end = vma->vm_end;
37 seen++;
38 }
39
40 vmas_seen = seen;
41 return 0;
42}
43
44char _license[] SEC("license") = "GPL";