cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bprm_opts.c (723B)

      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}