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}

 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}