// SPDX-License-Identifier: GPL-2.0

/*
 * Copyright 2020 Google LLC.
 */

#include <linux/bpf.h>
#include <errno.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

struct {
        __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
        __uint(map_flags, BPF_F_NO_PREALLOC);
        __type(key, int);
        __type(value, int);
} secure_exec_task_map SEC(".maps");

SEC("lsm/bprm_creds_for_exec")
int BPF_PROG(secure_exec, struct linux_binprm *bprm)
{
        int *secureexec;

        secureexec = bpf_task_storage_get(&secure_exec_task_map,
                                   bpf_get_current_task_btf(), 0,
                                   BPF_LOCAL_STORAGE_GET_F_CREATE);

        if (secureexec && *secureexec)
                bpf_bprm_opts_set(bprm, BPF_F_BPRM_SECUREEXEC);

        return 0;
}