1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * Copyright 2020 Google LLC.
5 */
6
7#include <linux/bpf.h>
8#include <errno.h>
9#include <bpf/bpf_helpers.h>
10#include <bpf/bpf_tracing.h>
11
12char _license[] SEC("license") = "GPL";
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} secure_exec_task_map SEC(".maps");
20
21SEC("lsm/bprm_creds_for_exec")
22int BPF_PROG(secure_exec, struct linux_binprm *bprm)
23{
24	int *secureexec;
25
26	secureexec = bpf_task_storage_get(&secure_exec_task_map,
27				   bpf_get_current_task_btf(), 0,
28				   BPF_LOCAL_STORAGE_GET_F_CREATE);
29
30	if (secureexec && *secureexec)
31		bpf_bprm_opts_set(bprm, BPF_F_BPRM_SECUREEXEC);
32
33	return 0;
34}
35