KFunc bpf_iter_task_vma_new
Create a new task vma iterator.
Definition
int bpf_iter_task_vma_new(struct bpf_iter_task_vma *it, struct task_struct *task, u64 addr)
Usage
Docs could be improved
This part of the docs is incomplete, contributions are very welcome
Program types
The following program types can make use of this kfunc:
- BPF_PROG_TYPE_CGROUP_SKB
- BPF_PROG_TYPE_CGROUP_SOCK_ADDR
- BPF_PROG_TYPE_LSM
- BPF_PROG_TYPE_LWT_IN
- BPF_PROG_TYPE_LWT_OUT
- BPF_PROG_TYPE_LWT_SEG6LOCAL
- BPF_PROG_TYPE_LWT_XMIT
- BPF_PROG_TYPE_NETFILTER
- BPF_PROG_TYPE_SCHED_ACT
- BPF_PROG_TYPE_SCHED_CLS
- BPF_PROG_TYPE_SK_SKB
- BPF_PROG_TYPE_SOCKET_FILTER
- BPF_PROG_TYPE_STRUCT_OPS
- BPF_PROG_TYPE_SYSCALL
- BPF_PROG_TYPE_TRACING
- BPF_PROG_TYPE_XDP
Example
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include "bpf_experimental.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
pid_t target_pid = 0;
unsigned int vmas_seen = 0;
struct {
__u64 vm_start;
__u64 vm_end;
} vm_ranges[1000];
SEC("raw_tp/sys_enter")
int iter_task_vma_for_each(const void *ctx)
{
struct task_struct *task = bpf_get_current_task_btf();
struct vm_area_struct *vma;
unsigned int seen = 0;
if (task->pid != target_pid)
return 0;
if (vmas_seen)
return 0;
bpf_for_each(task_vma, vma, task, 0) {
if (seen >= 1000)
break;
vm_ranges[seen].vm_start = vma->vm_start;
vm_ranges[seen].vm_end = vma->vm_end;
seen++;
}
vmas_seen = seen;
return 0;
}
char _license[] SEC("license") = "GPL";