| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|
| 2 | /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ |
|---|
| 3 | #include "bpf_iter.h" |
|---|
| 4 | #include <bpf/bpf_helpers.h> |
|---|
| 5 | |
|---|
| 6 | char _license[] SEC("license" ) = "GPL" ; |
|---|
| 7 | |
|---|
| 8 | __u32 unique_tgid_cnt = 0; |
|---|
| 9 | uintptr_t address = 0; |
|---|
| 10 | uintptr_t offset = 0; |
|---|
| 11 | __u32 last_tgid = 0; |
|---|
| 12 | __u32 pid = 0; |
|---|
| 13 | __u32 page_shift = 0; |
|---|
| 14 | |
|---|
| 15 | SEC("iter/task_vma" ) |
|---|
| 16 | int get_vma_offset(struct bpf_iter__task_vma *ctx) |
|---|
| 17 | { |
|---|
| 18 | struct vm_area_struct *vma = ctx->vma; |
|---|
| 19 | struct seq_file *seq = ctx->meta->seq; |
|---|
| 20 | struct task_struct *task = ctx->task; |
|---|
| 21 | |
|---|
| 22 | if (task == NULL || vma == NULL) |
|---|
| 23 | return 0; |
|---|
| 24 | |
|---|
| 25 | if (last_tgid != task->tgid) |
|---|
| 26 | unique_tgid_cnt++; |
|---|
| 27 | last_tgid = task->tgid; |
|---|
| 28 | |
|---|
| 29 | if (task->tgid != pid) |
|---|
| 30 | return 0; |
|---|
| 31 | |
|---|
| 32 | if (vma->vm_start <= address && vma->vm_end > address) { |
|---|
| 33 | offset = address - vma->vm_start + (vma->vm_pgoff << page_shift); |
|---|
| 34 | BPF_SEQ_PRINTF(seq, "OK\n" ); |
|---|
| 35 | } |
|---|
| 36 | return 0; |
|---|
| 37 | } |
|---|
| 38 | |
|---|
