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 (bpf_cmp_unlikely(seen, >=, 1000))
32			break;
33
34		vm_ranges[seen].vm_start = vma->vm_start;
35		vm_ranges[seen].vm_end = vma->vm_end;
36		seen++;
37	}
38
39	vmas_seen = seen;
40	return 0;
41}
42
43char _license[] SEC("license") = "GPL";