[src/netbsd-9]: src/sys/arch/amd64/amd64 Pull up following revision(s) (reque...

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

details:   https://anonhg.NetBSD.org/src/rev/72a19d07da83
branches:  netbsd-9
changeset: 843012:72a19d07da83
user:      martin <martin%NetBSD.org@localhost>
date:      Tue Aug 06 16:14:33 2019 +0000

description:
Pull up following revision(s) (requested by kamil in ticket #19):

        sys/arch/amd64/amd64/process_machdep.c: revision 1.44

Do not dereference user pointer in ptrace_machdep_dorequest()/amd64

Always use copyin(9) for reading user memory.

This fixes SMAP crash on some amd64 machines.

Reported by <msaitoh>

diffstat:

 sys/arch/amd64/amd64/process_machdep.c |  25 ++++++++++++++++---------
 1 files changed, 16 insertions(+), 9 deletions(-)

diffs (47 lines):

diff -r 1159473262c7 -r 72a19d07da83 sys/arch/amd64/amd64/process_machdep.c
--- a/sys/arch/amd64/amd64/process_machdep.c    Mon Aug 05 04:41:41 2019 +0000
+++ b/sys/arch/amd64/amd64/process_machdep.c    Tue Aug 06 16:14:33 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: process_machdep.c,v 1.43 2019/07/24 16:36:47 bouyer Exp $      */
+/*     $NetBSD: process_machdep.c,v 1.43.2.1 2019/08/06 16:14:33 martin Exp $  */
 
 /*
  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@@ -74,7 +74,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.43 2019/07/24 16:36:47 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.43.2.1 2019/08/06 16:14:33 martin Exp $");
 
 #include "opt_xen.h"
 #include <sys/param.h>
@@ -327,14 +327,21 @@
                if (!process_machdep_validxstate(lt->l_proc))
                        return EINVAL;
                if (__predict_false(l->l_proc->p_flag & PK_32)) {
-                       struct netbsd32_iovec *user_iov = addr;
-                       iov.iov_base = NETBSD32PTR64(user_iov->iov_base);
-                       iov.iov_len = user_iov->iov_len;
+                       struct netbsd32_iovec user_iov;
+                       if ((error = copyin(addr, &user_iov, sizeof(user_iov)))
+                           != 0)
+                               return error;
+
+                       iov.iov_base = NETBSD32PTR64(user_iov.iov_base);
+                       iov.iov_len = user_iov.iov_len;
                } else {
-                       struct iovec *user_iov;
-                       user_iov = (struct iovec*)addr;
-                       iov.iov_base = user_iov->iov_base;
-                       iov.iov_len = user_iov->iov_len;
+                       struct iovec user_iov;
+                       if ((error = copyin(addr, &user_iov, sizeof(user_iov)))
+                           != 0)
+                               return error;
+
+                       iov.iov_base = user_iov.iov_base;
+                       iov.iov_len = user_iov.iov_len;
                }
 
                error = proc_vmspace_getref(l->l_proc, &vm);