From 65320f8e65b2fd5215822c6fc85034cec63dd887 Mon Sep 17 00:00:00 2001
From: Aleksandr Nogikh <nogikh@google.com>
Date: Fri, 21 Apr 2023 14:45:31 +0200
Subject: sys/netbsd: neutralize compat_50_mknod

Otherwise we may end up corrupting device memory.

See https://groups.google.com/g/syzkaller-netbsd-bugs/c/Iy8-NZ_M9Ug/m/5jKKfncsAQAJ
---
 sys/netbsd/init_test.go | 21 +++++++++++++++++++++
 sys/targets/common.go   |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 sys/netbsd/init_test.go

(limited to 'sys')

diff --git a/sys/netbsd/init_test.go b/sys/netbsd/init_test.go
new file mode 100644
index 000000000..1f0abfad3
--- /dev/null
+++ b/sys/netbsd/init_test.go
@@ -0,0 +1,21 @@
+// Copyright 2023 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package netbsd_test
+
+import (
+	"testing"
+
+	"github.com/google/syzkaller/prog"
+	_ "github.com/google/syzkaller/sys/netbsd/gen"
+	"github.com/google/syzkaller/sys/targets"
+)
+
+func TestNetBSDNeutralize(t *testing.T) {
+	prog.TestDeserializeHelper(t, targets.NetBSD, targets.AMD64, nil, []prog.DeserializeTest{
+		{
+			In:  `compat_50_mknod(&(0x7f0000000000)='./file0\x00', 0x2001, 0x400)`,
+			Out: `compat_50_mknod(&(0x7f0000000000)='./file0\x00', 0x8001, 0x400)`,
+		},
+	})
+}
diff --git a/sys/targets/common.go b/sys/targets/common.go
index a29365ce3..b6827e76e 100644
--- a/sys/targets/common.go
+++ b/sys/targets/common.go
@@ -91,7 +91,7 @@ func (arch *UnixNeutralizer) Neutralize(c *prog.Call, fixStructure bool) error {
 		}
 		// Add MAP_FIXED flag, otherwise it produces non-deterministic results.
 		c.Args[3].(*prog.ConstArg).Val |= arch.MAP_FIXED
-	case "mknod", "mknodat":
+	case "mknod", "mknodat", "compat_50_mknod":
 		pos := 1
 		if c.Meta.CallName == "mknodat" {
 			pos = 2
-- 
cgit mrf-deployment