1 // SPDX-License-Identifier: GPL-2.0
2 
3 /*
4  * Copyright 2020 Google LLC.
5  */
6 
7 #include "vmlinux.h"
8 #include <errno.h>
9 #include <bpf/bpf_helpers.h>
10 #include <bpf/bpf_tracing.h>
11 
12 char _license[] SEC("license") = "GPL";
13 
14 struct {
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 
21 SEC("lsm/bprm_creds_for_exec")
22 int 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