[src/trunk]: src/sys/kern Check the CTF magic number in an endian friendly wa...

[simonb <simonb%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d01253cfd734
branches:  trunk
changeset: 961013:d01253cfd734
user:      simonb <simonb%NetBSD.org@localhost>
date:      Tue Apr 06 07:57:03 2021 +0000

description:
Check the CTF magic number in an endian friendly way (and don't use
magic numbers to check the magic number!).

diffstat:

 sys/kern/kern_ctf.c |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diffs (29 lines):

diff -r e89006d2cb1a -r d01253cfd734 sys/kern/kern_ctf.c
--- a/sys/kern/kern_ctf.c       Tue Apr 06 07:56:10 2021 +0000
+++ b/sys/kern/kern_ctf.c       Tue Apr 06 07:57:03 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_ctf.c,v 1.7 2018/05/28 21:05:00 chs Exp $ */
+/*     $NetBSD: kern_ctf.c,v 1.8 2021/04/06 07:57:03 simonb Exp $      */
 /*-
  * Copyright (c) 2008 John Birrell <jb%freebsd.org@localhost>
  * All rights reserved.
@@ -81,6 +81,7 @@
 
        void *ctfbuf = NULL;
        uint8_t *ctfaddr;
+       uint16_t ctfmagic;
        size_t ctfsize;
 
        /*
@@ -137,8 +138,9 @@
                goto out;
        }
 
-       /* Check the CTF magic number. (XXX check for big endian!) */
-       if (ctfaddr[0] != 0xf1 || ctfaddr[1] != 0xcf) {
+       /* Check the CTF magic number. */
+       memcpy(&ctfmagic, ctfaddr, sizeof ctfmagic);
+       if (ctfmagic != CTF_MAGIC) {
                error = EINVAL;
                goto out;
        }