30 lines
587 B
C
30 lines
587 B
C
// 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_task(struct task_struct *task, struct vm_area_struct *vma,
|
|
struct callback_ctx *data)
|
|
{
|
|
/* writing to task, which is illegal */
|
|
task->mm = NULL;
|
|
|
|
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_task, &data, 0);
|
|
return 0;
|
|
}
|