[src/trunk]: src/sys/arch/amd64/amd64 Replace misaligned operations with memc...

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

details:   https://anonhg.NetBSD.org/src/rev/730e9b5f11c6
branches:  trunk
changeset: 999294:730e9b5f11c6
user:      kamil <kamil%NetBSD.org@localhost>
date:      Tue May 28 03:52:08 2019 +0000

description:
Replace misaligned operations with memcpy() calls in kobj_machdep.c

Detected with kUBSan.

diffstat:

 sys/arch/amd64/amd64/kobj_machdep.c |  14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diffs (61 lines):

diff -r 30bb6e4c3573 -r 730e9b5f11c6 sys/arch/amd64/amd64/kobj_machdep.c
--- a/sys/arch/amd64/amd64/kobj_machdep.c       Tue May 28 01:20:02 2019 +0000
+++ b/sys/arch/amd64/amd64/kobj_machdep.c       Tue May 28 03:52:08 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kobj_machdep.c,v 1.7 2018/12/24 21:48:52 christos Exp $        */
+/*     $NetBSD: kobj_machdep.c,v 1.8 2019/05/28 03:52:08 kamil Exp $   */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -55,7 +55,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.7 2018/12/24 21:48:52 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.8 2019/05/28 03:52:08 kamil Exp $");
 
 #define        ELFSIZE         ARCH_ELFSIZE
 
@@ -115,7 +115,7 @@
                if (error)
                        return -1;
                val = addr + addend;
-               *where = val;
+               memcpy(where, &val, sizeof(val));
                break;
 
        case R_X86_64_PC32:     /* S + A - P */
@@ -125,7 +125,7 @@
                        return -1;
                where32 = (Elf32_Addr *)where;
                val32 = (Elf32_Addr)(addr + addend - (Elf64_Addr)where);
-               *where32 = val32;
+               memcpy(where32, &val32, sizeof(val32));
                break;
 
        case R_X86_64_32:       /* S + A */
@@ -135,7 +135,7 @@
                        return -1;
                val32 = (Elf32_Addr)(addr + addend);
                where32 = (Elf32_Addr *)where;
-               *where32 = val32;
+               memcpy(where32, &val32, sizeof(val32));
                break;
 
        case R_X86_64_GLOB_DAT: /* S */
@@ -143,13 +143,13 @@
                error = kobj_sym_lookup(ko, symidx, &addr);
                if (error)
                        return -1;
-               *where = addr;
+               memcpy(where, &addr, sizeof(addr));
                break;
 
        case R_X86_64_RELATIVE: /* B + A */
                addr = relocbase + addend;
                val = addr;
-               *where = val;
+               memcpy(where, &val, sizeof(val));
                break;
 
        default: