1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
char _license[] SEC("license") = "GPL";
struct callback_ctx {
int dummy;
};
static long write_vma(struct task_struct *task, struct vm_area_struct *vma,
struct callback_ctx *data)
{
/* writing to vma, which is illegal */
vma->vm_flags |= 0x55;
return 0;
}
SEC("raw_tp/sys_enter")
int handle_getpid(void)
{
struct task_struct *task = bpf_get_current_task_btf();
struct callback_ctx data = {};
bpf_find_vma(task, 0, write_vma, &data, 0);
return 0;
}
|
