Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include "vmlinux.h"
4#include <errno.h>
5#include <bpf/bpf_helpers.h>
6#include <bpf/bpf_tracing.h>
7
8char _license[] SEC("license") = "GPL";
9
10extern bool CONFIG_PREEMPTION __kconfig __weak;
11int nr_get_errs = 0;
12int nr_del_errs = 0;
13
14struct {
15 __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
16 __uint(map_flags, BPF_F_NO_PREALLOC);
17 __type(key, int);
18 __type(value, int);
19} task_storage SEC(".maps");
20
21SEC("lsm.s/socket_post_create")
22int BPF_PROG(socket_post_create, struct socket *sock, int family, int type,
23 int protocol, int kern)
24{
25 struct task_struct *task;
26 int ret, zero = 0;
27 int *value;
28
29 if (!CONFIG_PREEMPTION)
30 return 0;
31
32 task = bpf_get_current_task_btf();
33 value = bpf_task_storage_get(&task_storage, task, &zero,
34 BPF_LOCAL_STORAGE_GET_F_CREATE);
35 if (!value)
36 __sync_fetch_and_add(&nr_get_errs, 1);
37
38 ret = bpf_task_storage_delete(&task_storage,
39 bpf_get_current_task_btf());
40 if (ret == -EDEADLK || ret == -ETIMEDOUT)
41 __sync_fetch_and_add(&nr_del_errs, 1);
42
43 return 0;
44}