details: https://anonhg.NetBSD.org/src/rev/b1e3b77d4a71
branches: trunk
changeset: 841144:b1e3b77d4a71
user: kamil <kamil%NetBSD.org@localhost>
date: Tue Apr 30 22:32:01 2019 +0000
description:
Reject ptrace(2) PIOD_READ/WRITE operations with length 0
Return EINVAL for such invalid requests.
diffstat:
sys/kern/sys_ptrace_common.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diffs (29 lines):
diff -r 87f60f8e67b5 -r b1e3b77d4a71 sys/kern/sys_ptrace_common.c
--- a/sys/kern/sys_ptrace_common.c Tue Apr 30 22:24:27 2019 +0000
+++ b/sys/kern/sys_ptrace_common.c Tue Apr 30 22:32:01 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: sys_ptrace_common.c,v 1.49 2019/04/30 20:50:30 kamil Exp $ */
+/* $NetBSD: sys_ptrace_common.c,v 1.50 2019/04/30 22:32:01 kamil Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -118,7 +118,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_ptrace_common.c,v 1.49 2019/04/30 20:50:30 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_ptrace_common.c,v 1.50 2019/04/30 22:32:01 kamil Exp $");
#ifdef _KERNEL_OPT
#include "opt_ptrace.h"
@@ -1117,6 +1117,10 @@
case PT_IO:
if ((error = ptm->ptm_copyin_piod(&piod, addr, data)) != 0)
break;
+ if (piod.piod_len < 1) {
+ error = EINVAL;
+ break;
+ }
if ((error = ptrace_doio(l, t, lt, &piod, addr, false)) != 0)
break;
if (piod.piod_len < 1) {