tools/testing/selftests/bpf/progs/bprm_opts.c

   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 }