linux/security/selinux/exports.c
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   1/*
   2 * SELinux services exported to the rest of the kernel.
   3 *
   4 * Author: James Morris <jmorris@redhat.com>
   5 *
   6 * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com>
   7 * Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   8 * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2,
  12 * as published by the Free Software Foundation.
  13 */
  14#include <linux/types.h>
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/selinux.h>
  18#include <linux/fs.h>
  19#include <linux/ipc.h>
  20#include <asm/atomic.h>
  21
  22#include "security.h"
  23#include "objsec.h"
  24
  25/* SECMARK reference count */
  26extern atomic_t selinux_secmark_refcount;
  27
  28int selinux_string_to_sid(char *str, u32 *sid)
  29{
  30        if (selinux_enabled)
  31                return security_context_to_sid(str, strlen(str), sid);
  32        else {
  33                *sid = 0;
  34                return 0;
  35        }
  36}
  37EXPORT_SYMBOL_GPL(selinux_string_to_sid);
  38
  39int selinux_secmark_relabel_packet_permission(u32 sid)
  40{
  41        if (selinux_enabled) {
  42                struct task_security_struct *tsec = current->security;
  43
  44                return avc_has_perm(tsec->sid, sid, SECCLASS_PACKET,
  45                                    PACKET__RELABELTO, NULL);
  46        }
  47        return 0;
  48}
  49EXPORT_SYMBOL_GPL(selinux_secmark_relabel_packet_permission);
  50
  51void selinux_secmark_refcount_inc(void)
  52{
  53        atomic_inc(&selinux_secmark_refcount);
  54}
  55EXPORT_SYMBOL_GPL(selinux_secmark_refcount_inc);
  56
  57void selinux_secmark_refcount_dec(void)
  58{
  59        atomic_dec(&selinux_secmark_refcount);
  60}
  61EXPORT_SYMBOL_GPL(selinux_secmark_refcount_dec);
  62