bsd/kern/kern_ecc.c

   1 /*
   2 * Copyright (c) 2013 Apple Inc. All rights reserved.
   3 *
   4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5 *
   6 * This file contains Original Code and/or Modifications of Original Code
   7 * as defined in and that are subject to the Apple Public Source License
   8 * Version 2.0 (the 'License'). You may not use this file except in
   9 * compliance with the License. The rights granted to you under the License
  10 * may not be used to create, or enable the creation or redistribution of,
  11 * unlawful or unlicensed copies of an Apple operating system, or to
  12 * circumvent, violate, or enable the circumvention or violation of, any
  13 * terms of an Apple operating system software license agreement.
  14 *
  15 * Please obtain a copy of the License at
  16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17 *
  18 * The Original Code and all software distributed under the License are
  19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23 * Please see the License for the specific language governing rights and
  24 * limitations under the License.
  25 *
  26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27 */
  28 #include <kern/debug.h>
  29 #include <sys/param.h>
  30 #include <sys/mman.h>
  31 #include <sys/stat.h>
  32 #include <sys/sysctl.h>
  33 #include <sys/priv.h>
  34 #include <mach/machine.h>
  35 #include <libkern/libkern.h>
  36 #include <kern/assert.h>
  37 #include <pexpert/pexpert.h>
  38 #include <kern/ecc.h>
  39
  40 static int
  41 get_ecc_data_handler(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2,
  42                 struct sysctl_req *req)
  43 {
  44         struct ecc_event ev;
  45         int changed, retval;
  46
  47         if (priv_check_cred(kauth_cred_get(), PRIV_HW_DEBUG_DATA, 0) != 0) {
  48                 return EPERM;
  49         }
  50
  51         if (KERN_SUCCESS != ecc_log_get_next_event(&ev)) {
  52                 /*
  53                  * EAGAIN would be better, but sysctl infrastructure
  54                  * interprets that */
  55                 return EBUSY;
  56         }
  57
  58         retval = sysctl_io_opaque(req, &ev, sizeof(ev), &changed);
  59         assert(!changed);
  60
  61         return retval;
  62 }
  63
  64 SYSCTL_PROC(_kern, OID_AUTO, next_ecc_event,
  65             CTLFLAG_RD | CTLFLAG_ANYBODY | CTLFLAG_MASKED | CTLTYPE_STRUCT,
  66             0, 0, get_ecc_data_handler,
  67             "-", "");