lsm_tailcall.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2024 Huawei Technologies Co., Ltd */
 3
 4#include "vmlinux.h"
 5#include <errno.h>
 6#include <bpf/bpf_helpers.h>
 7
 8char _license[] SEC("license") = "GPL";
 9
10struct {
11	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
12	__uint(max_entries, 1);
13	__uint(key_size, sizeof(__u32));
14	__uint(value_size, sizeof(__u32));
15} jmp_table SEC(".maps");
16
17SEC("lsm/file_permission")
18int lsm_file_permission_prog(void *ctx)
19{
20	return 0;
21}
22
23SEC("lsm/kernfs_init_security")
24int lsm_kernfs_init_security_prog(void *ctx)
25{
26	return 0;
27}
28
29SEC("lsm/kernfs_init_security")
30int lsm_kernfs_init_security_entry(void *ctx)
31{
32	bpf_tail_call_static(ctx, &jmp_table, 0);
33	return 0;
34}