| 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 | |
| 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 |