summaryrefslogtreecommitdiffstats
path: root/meta/recipes-multimedia/libsndfile/files/0001-src-sd2.c-Fix-segfault-in-SD2-RSRC-parser.patch
blob: cd48710fb7a507cc551fbc4426c5ad622c6da100 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
From 9341e9c6e70cd3ad76c901c3cf052d4cb52fd827 Mon Sep 17 00:00:00 2001
From: Erik de Castro Lopo <erikd@mega-nerd.com>
Date: Thu, 27 Jun 2013 18:04:03 +1000
Subject: [PATCH] src/sd2.c : Fix segfault in SD2 RSRC parser.

(Upstream commit 9341e9c6e70cd3ad76c901c3cf052d4cb52fd827)

A specially crafted resource fork for an SD2 file can cause
the SD2 RSRC parser to read data from outside a dynamically
defined buffer. The data that is read is converted into a
short or int and used during further processing.

Since no write occurs, this is unlikely to be exploitable.

Bug reported by The Mayhem Team from Cylab, Carnegie Mellon
Univeristy. Paper is:
http://users.ece.cmu.edu/~arebert/papers/mayhem-oakland-12.pdf

Upstream-Status: Backport

Signed-off-by: Yue Tao <yue.tao@windriver.com>
---
 src/sd2.c |   93 ++++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 55 insertions(+), 38 deletions(-)

diff --git a/src/sd2.c b/src/sd2.c
index 35ce36b..6be150c 100644
--- a/src/sd2.c
+++ b/src/sd2.c
@@ -1,5 +1,5 @@
 /*
-** Copyright (C) 2001-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
+** Copyright (C) 2001-2013 Erik de Castro Lopo <erikd@mega-nerd.com>
 ** Copyright (C) 2004 Paavo Jumppanen
 **
 ** This program is free software; you can redistribute it and/or modify
@@ -371,44 +371,61 @@ sd2_write_rsrc_fork (SF_PRIVATE *psf, int UNUSED (calc_length))
 */
 
 static inline int
-read_char (const unsigned char * data, int offset)
-{	return data [offset] ;
-} /* read_char */
+read_rsrc_char (const SD2_RSRC *prsrc, int offset)
+{	const unsigned char * data = prsrc->rsrc_data ;
+	if (offset < 0 || offset >= prsrc->rsrc_len)
+		return 0 ;
+	return data [offset] ;
+} /* read_rsrc_char */
 
 static inline int
-read_short (const unsigned char * data, int offset)
-{	return (data [offset] << 8) + data [offset + 1] ;
-} /* read_short */
+read_rsrc_short (const SD2_RSRC *prsrc, int offset)
+{	const unsigned char * data = prsrc->rsrc_data ;
+	if (offset < 0 || offset + 1 >= prsrc->rsrc_len)
+		return 0 ;
+	return (data [offset] << 8) + data [offset + 1] ;
+} /* read_rsrc_short */
 
 static inline int
-read_int (const unsigned char * data, int offset)
-{	return (data [offset] << 24) + (data [offset + 1] << 16) + (data [offset + 2] << 8) + data [offset + 3] ;
-} /* read_int */
+read_rsrc_int (const SD2_RSRC *prsrc, int offset)
+{	const unsigned char * data = prsrc->rsrc_data ;
+	if (offset < 0 || offset + 3 >= prsrc->rsrc_len)
+		return 0 ;
+	return (data [offset] << 24) + (data [offset + 1] << 16) + (data [offset + 2] << 8) + data [offset + 3] ;
+} /* read_rsrc_int */
 
 static inline int
-read_marker (const unsigned char * data, int offset)
-{
+read_rsrc_marker (const SD2_RSRC *prsrc, int offset)
+{	const unsigned char * data = prsrc->rsrc_data ;
+
+	if (offset < 0 || offset + 3 >= prsrc->rsrc_len)
+		return 0 ;
+
 	if (CPU_IS_BIG_ENDIAN)
 		return (data [offset] << 24) + (data [offset + 1] << 16) + (data [offset + 2] << 8) + data [offset + 3] ;
-	else if (CPU_IS_LITTLE_ENDIAN)
+	if (CPU_IS_LITTLE_ENDIAN)
 		return data [offset] + (data [offset + 1] << 8) + (data [offset + 2] << 16) + (data [offset + 3] << 24) ;
-	else
-		return 0x666 ;
-} /* read_marker */
+
+	return 0 ;
+} /* read_rsrc_marker */
 
 static void
-read_str (const unsigned char * data, int offset, char * buffer, int buffer_len)
-{	int k ;
+read_rsrc_str (const SD2_RSRC *prsrc, int offset, char * buffer, int buffer_len)
+{	const unsigned char * data = prsrc->rsrc_data ;
+	int k ;
 
 	memset (buffer, 0, buffer_len) ;
 
+	if (offset < 0 || offset + buffer_len >= prsrc->rsrc_len)
+		return ;
+
 	for (k = 0 ; k < buffer_len - 1 ; k++)
 	{	if (psf_isprint (data [offset + k]) == 0)
 			return ;
 		buffer [k] = data [offset + k] ;
 		} ;
 	return ;
-} /* read_str */
+} /* read_rsrc_str */
 
 static int
 sd2_parse_rsrc_fork (SF_PRIVATE *psf)
@@ -435,17 +452,17 @@ sd2_parse_rsrc_fork (SF_PRIVATE *psf)
 	/* Reset the header storage because we have changed to the rsrcdes. */
 	psf->headindex = psf->headend = rsrc.rsrc_len ;
 
-	rsrc.data_offset = read_int (rsrc.rsrc_data, 0) ;
-	rsrc.map_offset = read_int (rsrc.rsrc_data, 4) ;
-	rsrc.data_length = read_int (rsrc.rsrc_data, 8) ;
-	rsrc.map_length = read_int (rsrc.rsrc_data, 12) ;
+	rsrc.data_offset = read_rsrc_int (&rsrc, 0) ;
+	rsrc.map_offset = read_rsrc_int (&rsrc, 4) ;
+	rsrc.data_length = read_rsrc_int (&rsrc, 8) ;
+	rsrc.map_length = read_rsrc_int (&rsrc, 12) ;
 
 	if (rsrc.data_offset == 0x51607 && rsrc.map_offset == 0x20000)
 	{	psf_log_printf (psf, "Trying offset of 0x52 bytes.\n") ;
-		rsrc.data_offset = read_int (rsrc.rsrc_data, 0x52 + 0) + 0x52 ;
-		rsrc.map_offset = read_int (rsrc.rsrc_data, 0x52 + 4) + 0x52 ;
-		rsrc.data_length = read_int (rsrc.rsrc_data, 0x52 + 8) ;
-		rsrc.map_length = read_int (rsrc.rsrc_data, 0x52 + 12) ;
+		rsrc.data_offset = read_rsrc_int (&rsrc, 0x52 + 0) + 0x52 ;
+		rsrc.map_offset = read_rsrc_int (&rsrc, 0x52 + 4) + 0x52 ;
+		rsrc.data_length = read_rsrc_int (&rsrc, 0x52 + 8) ;
+		rsrc.map_length = read_rsrc_int (&rsrc, 0x52 + 12) ;
 		} ;
 
 	psf_log_printf (psf, "  data offset : 0x%04X\n  map  offset : 0x%04X\n"
@@ -488,7 +505,7 @@ sd2_parse_rsrc_fork (SF_PRIVATE *psf)
 		goto parse_rsrc_fork_cleanup ;
 		} ;
 
-	rsrc.string_offset = rsrc.map_offset + read_short (rsrc.rsrc_data, rsrc.map_offset + 26) ;
+	rsrc.string_offset = rsrc.map_offset + read_rsrc_short (&rsrc, rsrc.map_offset + 26) ;
 	if (rsrc.string_offset > rsrc.rsrc_len)
 	{	psf_log_printf (psf, "Bad string offset (%d).\n", rsrc.string_offset) ;
 		error = SFE_SD2_BAD_RSRC ;
@@ -497,7 +514,7 @@ sd2_parse_rsrc_fork (SF_PRIVATE *psf)
 
 	rsrc.type_offset = rsrc.map_offset + 30 ;
 
-	rsrc.type_count = read_short (rsrc.rsrc_data, rsrc.map_offset + 28) + 1 ;
+	rsrc.type_count = read_rsrc_short (&rsrc, rsrc.map_offset + 28) + 1 ;
 	if (rsrc.type_count < 1)
 	{	psf_log_printf (psf, "Bad type count.\n") ;
 		error = SFE_SD2_BAD_RSRC ;
@@ -513,11 +530,11 @@ sd2_parse_rsrc_fork (SF_PRIVATE *psf)
 
 	rsrc.str_index = -1 ;
 	for (k = 0 ; k < rsrc.type_count ; k ++)
-	{	marker = read_marker (rsrc.rsrc_data, rsrc.type_offset + k * 8) ;
+	{	marker = read_rsrc_marker (&rsrc, rsrc.type_offset + k * 8) ;
 
 		if (marker == STR_MARKER)
 		{	rsrc.str_index = k ;
-			rsrc.str_count = read_short (rsrc.rsrc_data, rsrc.type_offset + k * 8 + 4) + 1 ;
+			rsrc.str_count = read_rsrc_short (&rsrc, rsrc.type_offset + k * 8 + 4) + 1 ;
 			error = parse_str_rsrc (psf, &rsrc) ;
 			goto parse_rsrc_fork_cleanup ;
 			} ;
@@ -549,26 +566,26 @@ parse_str_rsrc (SF_PRIVATE *psf, SD2_RSRC * rsrc)
 	for (k = 0 ; data_offset + data_len < rsrc->rsrc_len ; k++)
 	{	int slen ;
 
-		slen = read_char (rsrc->rsrc_data, str_offset) ;
-		read_str (rsrc->rsrc_data, str_offset + 1, name, SF_MIN (SIGNED_SIZEOF (name), slen + 1)) ;
+		slen = read_rsrc_char (rsrc, str_offset) ;
+		read_rsrc_str (rsrc, str_offset + 1, name, SF_MIN (SIGNED_SIZEOF (name), slen + 1)) ;
 		str_offset += slen + 1 ;
 
-		rsrc_id = read_short (rsrc->rsrc_data, rsrc->item_offset + k * 12) ;
+		rsrc_id = read_rsrc_short (rsrc, rsrc->item_offset + k * 12) ;
 
-		data_offset = rsrc->data_offset + read_int (rsrc->rsrc_data, rsrc->item_offset + k * 12 + 4) ;
+		data_offset = rsrc->data_offset + read_rsrc_int (rsrc, rsrc->item_offset + k * 12 + 4) ;
 		if (data_offset < 0 || data_offset > rsrc->rsrc_len)
 		{	psf_log_printf (psf, "Exiting parser on data offset of %d.\n", data_offset) ;
 			break ;
 			} ;
 
-		data_len = read_int (rsrc->rsrc_data, data_offset) ;
+		data_len = read_rsrc_int (rsrc, data_offset) ;
 		if (data_len < 0 || data_len > rsrc->rsrc_len)
 		{	psf_log_printf (psf, "Exiting parser on data length of %d.\n", data_len) ;
 			break ;
 			} ;
 
-		slen = read_char (rsrc->rsrc_data, data_offset + 4) ;
-		read_str (rsrc->rsrc_data, data_offset + 5, value, SF_MIN (SIGNED_SIZEOF (value), slen + 1)) ;
+		slen = read_rsrc_char (rsrc, data_offset + 4) ;
+		read_rsrc_str (rsrc, data_offset + 5, value, SF_MIN (SIGNED_SIZEOF (value), slen + 1)) ;
 
 		psf_log_printf (psf, "  0x%04x     %4d     %4d     %3d    '%s'\n", data_offset, rsrc_id, data_len, slen, value) ;
 
-- 
1.7.9.5