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add security fixes for CVE-2016-0718, CVE-2012-6702, CVE-2016-5300,

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CVE-2016-4472
Resolves: CVE-2012-6702
Resolves: CVE-2016-0718
Resolves: CVE-2016-5300
Resolves: CVE-2016-4472
This commit is contained in:
Joe Orton 2016-06-16 15:34:05 +01:00
parent b068659f34
commit 27e66613e8
4 changed files with 905 additions and 1 deletions
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116
expat-2.1.1-CVE-2012-6702.patch Normal file
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@ -0,0 +1,116 @@
From cb31522769d11a375078a073cba94e7176cb48a4 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Wed, 16 Mar 2016 15:30:12 +0100
Subject: [PATCH] Resolve call to srand, use more entropy (patch version 1.0)
Squashed backport against vanilla Expat 2.1.1, addressing:
* CVE-2012-6702 -- unanticipated internal calls to srand
* CVE-2016-5300 -- use of too little entropy
Since commit e3e81a6d9f0885ea02d3979151c358f314bf3d6d
(released with Expat 2.1.0) Expat called srand by itself
from inside generate_hash_secret_salt for an instance
of XML_Parser if XML_SetHashSalt was either (a) not called
for that instance or if (b) salt 0 was passed to XML_SetHashSalt
prior to parsing. That call to srand passed (rather litle)
entropy extracted from the current time as a seed for srand.
That call to srand (1) broke repeatability for code calling
srand with a non-random seed prior to parsing with Expat,
and (2) resulted in a rather small set of hashing salts in
Expat in total.
For a short- to mid-term fix, the new approach avoids calling
srand altogether, extracts more entropy out of the clock and
other sources, too.
For a long term fix, we may want to read sizeof(long) bytes
from a source like getrandom(..) on Linux, and from similar
sources on other supported architectures.
https://bugzilla.redhat.com/show_bug.cgi?id=1197087
diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index e308c79..c5f942f 100644
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -6,7 +6,14 @@
#include <string.h> /* memset(), memcpy() */
#include <assert.h>
#include <limits.h> /* UINT_MAX */
-#include <time.h> /* time() */
+
+#ifdef COMPILED_FROM_DSP
+#define getpid GetCurrentProcessId
+#else
+#include <sys/time.h> /* gettimeofday() */
+#include <sys/types.h> /* getpid() */
+#include <unistd.h> /* getpid() */
+#endif
#define XML_BUILDING_EXPAT 1
@@ -432,7 +439,7 @@ static ELEMENT_TYPE *
getElementType(XML_Parser parser, const ENCODING *enc,
const char *ptr, const char *end);
-static unsigned long generate_hash_secret_salt(void);
+static unsigned long generate_hash_secret_salt(XML_Parser parser);
static XML_Bool startParsing(XML_Parser parser);
static XML_Parser
@@ -691,11 +698,38 @@ static const XML_Char implicitContext[] = {
};
static unsigned long
-generate_hash_secret_salt(void)
+gather_time_entropy(void)
{
- unsigned int seed = time(NULL) % UINT_MAX;
- srand(seed);
- return rand();
+#ifdef COMPILED_FROM_DSP
+ FILETIME ft;
+ GetSystemTimeAsFileTime(&ft); /* never fails */
+ return ft.dwHighDateTime ^ ft.dwLowDateTime;
+#else
+ struct timeval tv;
+ int gettimeofday_res;
+
+ gettimeofday_res = gettimeofday(&tv, NULL);
+ assert (gettimeofday_res == 0);
+
+ /* Microseconds time is <20 bits entropy */
+ return tv.tv_usec;
+#endif
+}
+
+static unsigned long
+generate_hash_secret_salt(XML_Parser parser)
+{
+ /* Process ID is 0 bits entropy if attacker has local access
+ * XML_Parser address is few bits of entropy if attacker has local access */
+ const unsigned long entropy =
+ gather_time_entropy() ^ getpid() ^ (unsigned long)parser;
+
+ /* Factors are 2^31-1 and 2^61-1 (Mersenne primes M31 and M61) */
+ if (sizeof(unsigned long) == 4) {
+ return entropy * 2147483647;
+ } else {
+ return entropy * 2305843009213693951;
+ }
}
static XML_Bool /* only valid for root parser */
@@ -703,7 +737,7 @@ startParsing(XML_Parser parser)
{
/* hash functions must be initialized before setContext() is called */
if (hash_secret_salt == 0)
- hash_secret_salt = generate_hash_secret_salt();
+ hash_secret_salt = generate_hash_secret_salt(parser);
if (ns) {
/* implicit context only set for root parser, since child
parsers (i.e. external entity parsers) will inherit it
--
2.8.2

747
expat-2.1.1-CVE-2016-0718.patch Normal file
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@ -0,0 +1,747 @@
>From cdfcb1b5c95e93b00ae9e9d25708b4a3bee72c15 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Mon, 2 May 2016 00:02:44 +0200
Subject: [PATCH] Address CVE-2016-0718 (/patch/ version 2.2.1)
* Out of bounds memory access when doing text conversion on malformed input
* Integer overflow related to memory allocation
Reported by Gustavo Grieco
Patch credits go to
* Christian Heimes
* Karl Waclawek
* Gustavo Grieco
* Sebastian Pipping
* Pascal Cuoq
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -2426,11 +2426,11 @@ doContent(XML_Parser parser,
for (;;) {
int bufSize;
int convLen;
- XmlConvert(enc,
+ const enum XML_Convert_Result convert_res = XmlConvert(enc,
&fromPtr, rawNameEnd,
(ICHAR **)&toPtr, (ICHAR *)tag->bufEnd - 1);
convLen = (int)(toPtr - (XML_Char *)tag->buf);
- if (fromPtr == rawNameEnd) {
+ if ((convert_res == XML_CONVERT_COMPLETED) || (convert_res == XML_CONVERT_INPUT_INCOMPLETE)) {
tag->name.strLen = convLen;
break;
}
@@ -2651,11 +2651,11 @@ doContent(XML_Parser parser,
if (MUST_CONVERT(enc, s)) {
for (;;) {
ICHAR *dataPtr = (ICHAR *)dataBuf;
- XmlConvert(enc, &s, next, &dataPtr, (ICHAR *)dataBufEnd);
+ const enum XML_Convert_Result convert_res = XmlConvert(enc, &s, next, &dataPtr, (ICHAR *)dataBufEnd);
*eventEndPP = s;
charDataHandler(handlerArg, dataBuf,
(int)(dataPtr - (ICHAR *)dataBuf));
- if (s == next)
+ if ((convert_res == XML_CONVERT_COMPLETED) || (convert_res == XML_CONVERT_INPUT_INCOMPLETE))
break;
*eventPP = s;
}
@@ -3261,11 +3261,11 @@ doCdataSection(XML_Parser parser,
if (MUST_CONVERT(enc, s)) {
for (;;) {
ICHAR *dataPtr = (ICHAR *)dataBuf;
- XmlConvert(enc, &s, next, &dataPtr, (ICHAR *)dataBufEnd);
+ const enum XML_Convert_Result convert_res = XmlConvert(enc, &s, next, &dataPtr, (ICHAR *)dataBufEnd);
*eventEndPP = next;
charDataHandler(handlerArg, dataBuf,
(int)(dataPtr - (ICHAR *)dataBuf));
- if (s == next)
+ if ((convert_res == XML_CONVERT_COMPLETED) || (convert_res == XML_CONVERT_INPUT_INCOMPLETE))
break;
*eventPP = s;
}
@@ -5342,6 +5342,7 @@ reportDefault(XML_Parser parser, const ENCODING *enc,
const char *s, const char *end)
{
if (MUST_CONVERT(enc, s)) {
+ enum XML_Convert_Result convert_res;
const char **eventPP;
const char **eventEndPP;
if (enc == encoding) {
@@ -5354,11 +5355,11 @@ reportDefault(XML_Parser parser, const ENCODING *enc,
}
do {
ICHAR *dataPtr = (ICHAR *)dataBuf;
- XmlConvert(enc, &s, end, &dataPtr, (ICHAR *)dataBufEnd);
+ convert_res = XmlConvert(enc, &s, end, &dataPtr, (ICHAR *)dataBufEnd);
*eventEndPP = s;
defaultHandler(handlerArg, dataBuf, (int)(dataPtr - (ICHAR *)dataBuf));
*eventPP = s;
- } while (s != end);
+ } while ((convert_res != XML_CONVERT_COMPLETED) && (convert_res != XML_CONVERT_INPUT_INCOMPLETE));
}
else
defaultHandler(handlerArg, (XML_Char *)s, (int)((XML_Char *)end - (XML_Char *)s));
@@ -6163,8 +6164,8 @@ poolAppend(STRING_POOL *pool, const ENCODING *enc,
if (!pool->ptr && !poolGrow(pool))
return NULL;
for (;;) {
- XmlConvert(enc, &ptr, end, (ICHAR **)&(pool->ptr), (ICHAR *)pool->end);
- if (ptr == end)
+ const enum XML_Convert_Result convert_res = XmlConvert(enc, &ptr, end, (ICHAR **)&(pool->ptr), (ICHAR *)pool->end);
+ if ((convert_res == XML_CONVERT_COMPLETED) || (convert_res == XML_CONVERT_INPUT_INCOMPLETE))
break;
if (!poolGrow(pool))
return NULL;
@@ -6248,8 +6249,13 @@ poolGrow(STRING_POOL *pool)
}
}
if (pool->blocks && pool->start == pool->blocks->s) {
- int blockSize = (int)(pool->end - pool->start)*2;
- BLOCK *temp = (BLOCK *)
+ BLOCK *temp;
+ int blockSize = (int)((unsigned)(pool->end - pool->start)*2U);
+
+ if (blockSize < 0)
+ return XML_FALSE;
+
+ temp = (BLOCK *)
pool->mem->realloc_fcn(pool->blocks,
(offsetof(BLOCK, s)
+ blockSize * sizeof(XML_Char)));
@@ -6264,6 +6270,10 @@ poolGrow(STRING_POOL *pool)
else {
BLOCK *tem;
int blockSize = (int)(pool->end - pool->start);
+
+ if (blockSize < 0)
+ return XML_FALSE;
+
if (blockSize < INIT_BLOCK_SIZE)
blockSize = INIT_BLOCK_SIZE;
else
diff --git a/expat/lib/xmltok.c b/expat/lib/xmltok.c
index bf09dfc..cb98ce1 100644
--- a/expat/lib/xmltok.c
+++ b/expat/lib/xmltok.c
@@ -318,39 +318,55 @@ enum { /* UTF8_cvalN is value of masked first byte of N byte sequence */
UTF8_cval4 = 0xf0
};
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
utf8_toUtf8(const ENCODING *enc,
const char **fromP, const char *fromLim,
char **toP, const char *toLim)
{
+ enum XML_Convert_Result res = XML_CONVERT_COMPLETED;
char *to;
const char *from;
if (fromLim - *fromP > toLim - *toP) {
/* Avoid copying partial characters. */
+ res = XML_CONVERT_OUTPUT_EXHAUSTED;
for (fromLim = *fromP + (toLim - *toP); fromLim > *fromP; fromLim--)
if (((unsigned char)fromLim[-1] & 0xc0) != 0x80)
break;
}
- for (to = *toP, from = *fromP; from != fromLim; from++, to++)
+ for (to = *toP, from = *fromP; (from < fromLim) && (to < toLim); from++, to++)
*to = *from;
*fromP = from;
*toP = to;
+
+ if ((to == toLim) && (from < fromLim))
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
+ else
+ return res;
}
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
utf8_toUtf16(const ENCODING *enc,
const char **fromP, const char *fromLim,
unsigned short **toP, const unsigned short *toLim)
{
+ enum XML_Convert_Result res = XML_CONVERT_COMPLETED;
unsigned short *to = *toP;
const char *from = *fromP;
- while (from != fromLim && to != toLim) {
+ while (from < fromLim && to < toLim) {
switch (((struct normal_encoding *)enc)->type[(unsigned char)*from]) {
case BT_LEAD2:
+ if (fromLim - from < 2) {
+ res = XML_CONVERT_INPUT_INCOMPLETE;
+ break;
+ }
*to++ = (unsigned short)(((from[0] & 0x1f) << 6) | (from[1] & 0x3f));
from += 2;
break;
case BT_LEAD3:
+ if (fromLim - from < 3) {
+ res = XML_CONVERT_INPUT_INCOMPLETE;
+ break;
+ }
*to++ = (unsigned short)(((from[0] & 0xf) << 12)
| ((from[1] & 0x3f) << 6) | (from[2] & 0x3f));
from += 3;
@@ -358,8 +374,14 @@ utf8_toUtf16(const ENCODING *enc,
case BT_LEAD4:
{
unsigned long n;
- if (to + 1 == toLim)
+ if (toLim - to < 2) {
+ res = XML_CONVERT_OUTPUT_EXHAUSTED;
goto after;
+ }
+ if (fromLim - from < 4) {
+ res = XML_CONVERT_INPUT_INCOMPLETE;
+ goto after;
+ }
n = ((from[0] & 0x7) << 18) | ((from[1] & 0x3f) << 12)
| ((from[2] & 0x3f) << 6) | (from[3] & 0x3f);
n -= 0x10000;
@@ -377,6 +399,7 @@ utf8_toUtf16(const ENCODING *enc,
after:
*fromP = from;
*toP = to;
+ return res;
}
#ifdef XML_NS
@@ -425,7 +448,7 @@ static const struct normal_encoding internal_utf8_encoding = {
STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
};
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
latin1_toUtf8(const ENCODING *enc,
const char **fromP, const char *fromLim,
char **toP, const char *toLim)
@@ -433,30 +456,35 @@ latin1_toUtf8(const ENCODING *enc,
for (;;) {
unsigned char c;
if (*fromP == fromLim)
- break;
+ return XML_CONVERT_COMPLETED;
c = (unsigned char)**fromP;
if (c & 0x80) {
if (toLim - *toP < 2)
- break;
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
*(*toP)++ = (char)((c >> 6) | UTF8_cval2);
*(*toP)++ = (char)((c & 0x3f) | 0x80);
(*fromP)++;
}
else {
if (*toP == toLim)
- break;
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
*(*toP)++ = *(*fromP)++;
}
}
}
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
latin1_toUtf16(const ENCODING *enc,
const char **fromP, const char *fromLim,
unsigned short **toP, const unsigned short *toLim)
{
- while (*fromP != fromLim && *toP != toLim)
+ while (*fromP < fromLim && *toP < toLim)
*(*toP)++ = (unsigned char)*(*fromP)++;
+
+ if ((*toP == toLim) && (*fromP < fromLim))
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
+ else
+ return XML_CONVERT_COMPLETED;
}
#ifdef XML_NS
@@ -483,13 +511,18 @@ static const struct normal_encoding latin1_encoding = {
STANDARD_VTABLE(sb_)
};
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
ascii_toUtf8(const ENCODING *enc,
const char **fromP, const char *fromLim,
char **toP, const char *toLim)
{
- while (*fromP != fromLim && *toP != toLim)
+ while (*fromP < fromLim && *toP < toLim)
*(*toP)++ = *(*fromP)++;
+
+ if ((*toP == toLim) && (*fromP < fromLim))
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
+ else
+ return XML_CONVERT_COMPLETED;
}
#ifdef XML_NS
@@ -536,13 +569,14 @@ unicode_byte_type(char hi, char lo)
}
#define DEFINE_UTF16_TO_UTF8(E) \
-static void PTRCALL \
+static enum XML_Convert_Result PTRCALL \
E ## toUtf8(const ENCODING *enc, \
const char **fromP, const char *fromLim, \
char **toP, const char *toLim) \
{ \
- const char *from; \
- for (from = *fromP; from != fromLim; from += 2) { \
+ const char *from = *fromP; \
+ fromLim = from + (((fromLim - from) >> 1) << 1); /* shrink to even */ \
+ for (; from < fromLim; from += 2) { \
int plane; \
unsigned char lo2; \
unsigned char lo = GET_LO(from); \
@@ -552,7 +586,7 @@ E ## toUtf8(const ENCODING *enc, \
if (lo < 0x80) { \
if (*toP == toLim) { \
*fromP = from; \
- return; \
+ return XML_CONVERT_OUTPUT_EXHAUSTED; \
} \
*(*toP)++ = lo; \
break; \
@@ -562,7 +596,7 @@ E ## toUtf8(const ENCODING *enc, \
case 0x4: case 0x5: case 0x6: case 0x7: \
if (toLim - *toP < 2) { \
*fromP = from; \
- return; \
+ return XML_CONVERT_OUTPUT_EXHAUSTED; \
} \
*(*toP)++ = ((lo >> 6) | (hi << 2) | UTF8_cval2); \
*(*toP)++ = ((lo & 0x3f) | 0x80); \
@@ -570,7 +604,7 @@ E ## toUtf8(const ENCODING *enc, \
default: \
if (toLim - *toP < 3) { \
*fromP = from; \
- return; \
+ return XML_CONVERT_OUTPUT_EXHAUSTED; \
} \
/* 16 bits divided 4, 6, 6 amongst 3 bytes */ \
*(*toP)++ = ((hi >> 4) | UTF8_cval3); \
@@ -580,7 +614,11 @@ E ## toUtf8(const ENCODING *enc, \
case 0xD8: case 0xD9: case 0xDA: case 0xDB: \
if (toLim - *toP < 4) { \
*fromP = from; \
- return; \
+ return XML_CONVERT_OUTPUT_EXHAUSTED; \
+ } \
+ if (fromLim - from < 4) { \
+ *fromP = from; \
+ return XML_CONVERT_INPUT_INCOMPLETE; \
} \
plane = (((hi & 0x3) << 2) | ((lo >> 6) & 0x3)) + 1; \
*(*toP)++ = ((plane >> 2) | UTF8_cval4); \
@@ -596,20 +634,32 @@ E ## toUtf8(const ENCODING *enc, \
} \
} \
*fromP = from; \
+ if (from < fromLim) \
+ return XML_CONVERT_INPUT_INCOMPLETE; \
+ else \
+ return XML_CONVERT_COMPLETED; \
}
#define DEFINE_UTF16_TO_UTF16(E) \
-static void PTRCALL \
+static enum XML_Convert_Result PTRCALL \
E ## toUtf16(const ENCODING *enc, \
const char **fromP, const char *fromLim, \
unsigned short **toP, const unsigned short *toLim) \
{ \
+ enum XML_Convert_Result res = XML_CONVERT_COMPLETED; \
+ fromLim = *fromP + (((fromLim - *fromP) >> 1) << 1); /* shrink to even */ \
/* Avoid copying first half only of surrogate */ \
if (fromLim - *fromP > ((toLim - *toP) << 1) \
- && (GET_HI(fromLim - 2) & 0xF8) == 0xD8) \
+ && (GET_HI(fromLim - 2) & 0xF8) == 0xD8) { \
fromLim -= 2; \
- for (; *fromP != fromLim && *toP != toLim; *fromP += 2) \
+ res = XML_CONVERT_INPUT_INCOMPLETE; \
+ } \
+ for (; *fromP < fromLim && *toP < toLim; *fromP += 2) \
*(*toP)++ = (GET_HI(*fromP) << 8) | GET_LO(*fromP); \
+ if ((*toP == toLim) && (*fromP < fromLim)) \
+ return XML_CONVERT_OUTPUT_EXHAUSTED; \
+ else \
+ return res; \
}
#define SET2(ptr, ch) \
@@ -1288,7 +1338,7 @@ unknown_isInvalid(const ENCODING *enc, const char *p)
return (c & ~0xFFFF) || checkCharRefNumber(c) < 0;
}
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
unknown_toUtf8(const ENCODING *enc,
const char **fromP, const char *fromLim,
char **toP, const char *toLim)
@@ -1299,21 +1349,21 @@ unknown_toUtf8(const ENCODING *enc,
const char *utf8;
int n;
if (*fromP == fromLim)
- break;
+ return XML_CONVERT_COMPLETED;
utf8 = uenc->utf8[(unsigned char)**fromP];
n = *utf8++;
if (n == 0) {
int c = uenc->convert(uenc->userData, *fromP);
n = XmlUtf8Encode(c, buf);
if (n > toLim - *toP)
- break;
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
utf8 = buf;
*fromP += (AS_NORMAL_ENCODING(enc)->type[(unsigned char)**fromP]
- (BT_LEAD2 - 2));
}
else {
if (n > toLim - *toP)
- break;
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
(*fromP)++;
}
do {
@@ -1322,13 +1372,13 @@ unknown_toUtf8(const ENCODING *enc,
}
}
-static void PTRCALL
+static enum XML_Convert_Result PTRCALL
unknown_toUtf16(const ENCODING *enc,
const char **fromP, const char *fromLim,
unsigned short **toP, const unsigned short *toLim)
{
const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
- while (*fromP != fromLim && *toP != toLim) {
+ while (*fromP < fromLim && *toP < toLim) {
unsigned short c = uenc->utf16[(unsigned char)**fromP];
if (c == 0) {
c = (unsigned short)
@@ -1340,6 +1390,11 @@ unknown_toUtf16(const ENCODING *enc,
(*fromP)++;
*(*toP)++ = c;
}
+
+ if ((*toP == toLim) && (*fromP < fromLim))
+ return XML_CONVERT_OUTPUT_EXHAUSTED;
+ else
+ return XML_CONVERT_COMPLETED;
}
ENCODING *
@@ -1503,7 +1558,7 @@ initScan(const ENCODING * const *encodingTable,
{
const ENCODING **encPtr;
- if (ptr == end)
+ if (ptr >= end)
return XML_TOK_NONE;
encPtr = enc->encPtr;
if (ptr + 1 == end) {
diff --git a/expat/lib/xmltok.h b/expat/lib/xmltok.h
index ca867aa..752007e 100644
--- a/expat/lib/xmltok.h
+++ b/expat/lib/xmltok.h
@@ -130,6 +130,12 @@ typedef int (PTRCALL *SCANNER)(const ENCODING *,
const char *,
const char **);
+enum XML_Convert_Result {
+ XML_CONVERT_COMPLETED = 0,
+ XML_CONVERT_INPUT_INCOMPLETE = 1,
+ XML_CONVERT_OUTPUT_EXHAUSTED = 2 /* and therefore potentially input remaining as well */
+};
+
struct encoding {
SCANNER scanners[XML_N_STATES];
SCANNER literalScanners[XML_N_LITERAL_TYPES];
@@ -158,12 +164,12 @@ struct encoding {
const char *ptr,
const char *end,
const char **badPtr);
- void (PTRCALL *utf8Convert)(const ENCODING *enc,
+ enum XML_Convert_Result (PTRCALL *utf8Convert)(const ENCODING *enc,
const char **fromP,
const char *fromLim,
char **toP,
const char *toLim);
- void (PTRCALL *utf16Convert)(const ENCODING *enc,
+ enum XML_Convert_Result (PTRCALL *utf16Convert)(const ENCODING *enc,
const char **fromP,
const char *fromLim,
unsigned short **toP,
diff --git a/expat/lib/xmltok_impl.c b/expat/lib/xmltok_impl.c
index 9c2895b..6c5a3ba 100644
--- a/expat/lib/xmltok_impl.c
+++ b/expat/lib/xmltok_impl.c
@@ -93,13 +93,13 @@ static int PTRCALL
PREFIX(scanComment)(const ENCODING *enc, const char *ptr,
const char *end, const char **nextTokPtr)
{
- if (ptr != end) {
+ if (ptr < end) {
if (!CHAR_MATCHES(enc, ptr, ASCII_MINUS)) {
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
ptr += MINBPC(enc);
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
INVALID_CASES(ptr, nextTokPtr)
case BT_MINUS:
@@ -147,7 +147,7 @@ PREFIX(scanDecl)(const ENCODING *enc, const char *ptr,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
case BT_PERCNT:
if (ptr + MINBPC(enc) == end)
@@ -233,7 +233,7 @@ PREFIX(scanPi)(const ENCODING *enc, const char *ptr,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
case BT_S: case BT_CR: case BT_LF:
@@ -242,7 +242,7 @@ PREFIX(scanPi)(const ENCODING *enc, const char *ptr,
return XML_TOK_INVALID;
}
ptr += MINBPC(enc);
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
INVALID_CASES(ptr, nextTokPtr)
case BT_QUEST:
@@ -305,7 +305,7 @@ static int PTRCALL
PREFIX(cdataSectionTok)(const ENCODING *enc, const char *ptr,
const char *end, const char **nextTokPtr)
{
- if (ptr == end)
+ if (ptr >= end)
return XML_TOK_NONE;
if (MINBPC(enc) > 1) {
size_t n = end - ptr;
@@ -348,7 +348,7 @@ PREFIX(cdataSectionTok)(const ENCODING *enc, const char *ptr,
ptr += MINBPC(enc);
break;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
case BT_LEAD ## n: \
@@ -391,11 +391,11 @@ PREFIX(scanEndTag)(const ENCODING *enc, const char *ptr,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
case BT_S: case BT_CR: case BT_LF:
- for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
+ for (ptr += MINBPC(enc); ptr < end; ptr += MINBPC(enc)) {
switch (BYTE_TYPE(enc, ptr)) {
case BT_S: case BT_CR: case BT_LF:
break;
@@ -432,7 +432,7 @@ static int PTRCALL
PREFIX(scanHexCharRef)(const ENCODING *enc, const char *ptr,
const char *end, const char **nextTokPtr)
{
- if (ptr != end) {
+ if (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
case BT_DIGIT:
case BT_HEX:
@@ -441,7 +441,7 @@ PREFIX(scanHexCharRef)(const ENCODING *enc, const char *ptr,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
+ for (ptr += MINBPC(enc); ptr < end; ptr += MINBPC(enc)) {
switch (BYTE_TYPE(enc, ptr)) {
case BT_DIGIT:
case BT_HEX:
@@ -464,7 +464,7 @@ static int PTRCALL
PREFIX(scanCharRef)(const ENCODING *enc, const char *ptr,
const char *end, const char **nextTokPtr)
{
- if (ptr != end) {
+ if (ptr < end) {
if (CHAR_MATCHES(enc, ptr, ASCII_x))
return PREFIX(scanHexCharRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
switch (BYTE_TYPE(enc, ptr)) {
@@ -474,7 +474,7 @@ PREFIX(scanCharRef)(const ENCODING *enc, const char *ptr,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
+ for (ptr += MINBPC(enc); ptr < end; ptr += MINBPC(enc)) {
switch (BYTE_TYPE(enc, ptr)) {
case BT_DIGIT:
break;
@@ -506,7 +506,7 @@ PREFIX(scanRef)(const ENCODING *enc, const char *ptr, const char *end,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
case BT_SEMI:
@@ -529,7 +529,7 @@ PREFIX(scanAtts)(const ENCODING *enc, const char *ptr, const char *end,
#ifdef XML_NS
int hadColon = 0;
#endif
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
#ifdef XML_NS
@@ -716,7 +716,7 @@ PREFIX(scanLt)(const ENCODING *enc, const char *ptr, const char *end,
hadColon = 0;
#endif
/* we have a start-tag */
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
#ifdef XML_NS
@@ -740,7 +740,7 @@ PREFIX(scanLt)(const ENCODING *enc, const char *ptr, const char *end,
case BT_S: case BT_CR: case BT_LF:
{
ptr += MINBPC(enc);
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
case BT_GT:
@@ -785,7 +785,7 @@ static int PTRCALL
PREFIX(contentTok)(const ENCODING *enc, const char *ptr, const char *end,
const char **nextTokPtr)
{
- if (ptr == end)
+ if (ptr >= end)
return XML_TOK_NONE;
if (MINBPC(enc) > 1) {
size_t n = end - ptr;
@@ -832,7 +832,7 @@ PREFIX(contentTok)(const ENCODING *enc, const char *ptr, const char *end,
ptr += MINBPC(enc);
break;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
case BT_LEAD ## n: \
@@ -895,7 +895,7 @@ PREFIX(scanPercent)(const ENCODING *enc, const char *ptr, const char *end,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
case BT_SEMI:
@@ -921,7 +921,7 @@ PREFIX(scanPoundName)(const ENCODING *enc, const char *ptr, const char *end,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
case BT_CR: case BT_LF: case BT_S:
@@ -941,7 +941,7 @@ PREFIX(scanLit)(int open, const ENCODING *enc,
const char *ptr, const char *end,
const char **nextTokPtr)
{
- while (ptr != end) {
+ while (ptr < end) {
int t = BYTE_TYPE(enc, ptr);
switch (t) {
INVALID_CASES(ptr, nextTokPtr)
@@ -973,7 +973,7 @@ PREFIX(prologTok)(const ENCODING *enc, const char *ptr, const char *end,
const char **nextTokPtr)
{
int tok;
- if (ptr == end)
+ if (ptr >= end)
return XML_TOK_NONE;
if (MINBPC(enc) > 1) {
size_t n = end - ptr;
@@ -1141,7 +1141,7 @@ PREFIX(prologTok)(const ENCODING *enc, const char *ptr, const char *end,
*nextTokPtr = ptr;
return XML_TOK_INVALID;
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
case BT_GT: case BT_RPAR: case BT_COMMA:
@@ -1204,10 +1204,10 @@ PREFIX(attributeValueTok)(const ENCODING *enc, const char *ptr,
const char *end, const char **nextTokPtr)
{
const char *start;
- if (ptr == end)
+ if (ptr >= end)
return XML_TOK_NONE;
start = ptr;
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
case BT_LEAD ## n: ptr += n; break;
@@ -1262,10 +1262,10 @@ PREFIX(entityValueTok)(const ENCODING *enc, const char *ptr,
const char *end, const char **nextTokPtr)
{
const char *start;
- if (ptr == end)
+ if (ptr >= end)
return XML_TOK_NONE;
start = ptr;
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
case BT_LEAD ## n: ptr += n; break;
@@ -1326,7 +1326,7 @@ PREFIX(ignoreSectionTok)(const ENCODING *enc, const char *ptr,
end = ptr + n;
}
}
- while (ptr != end) {
+ while (ptr < end) {
switch (BYTE_TYPE(enc, ptr)) {
INVALID_CASES(ptr, nextTokPtr)
case BT_LT:
@@ -1373,7 +1373,7 @@ PREFIX(isPublicId)(const ENCODING *enc, const char *ptr, const char *end,
{
ptr += MINBPC(enc);
end -= MINBPC(enc);
- for (; ptr != end; ptr += MINBPC(enc)) {
+ for (; ptr < end; ptr += MINBPC(enc)) {
switch (BYTE_TYPE(enc, ptr)) {
case BT_DIGIT:
case BT_HEX:
@@ -1760,7 +1760,7 @@ PREFIX(updatePosition)(const ENCODING *enc,
case BT_CR:
pos->lineNumber++;
ptr += MINBPC(enc);
- if (ptr != end && BYTE_TYPE(enc, ptr) == BT_LF)
+ if (ptr < end && BYTE_TYPE(enc, ptr) == BT_LF)
ptr += MINBPC(enc);
pos->columnNumber = (XML_Size)-1;
break;
--
2.8.2

31
expat-2.1.1-CVE-2016-4472.patch Normal file
View File

@ -0,0 +1,31 @@
commit f0bec73b018caa07d3e75ec8dd967f3785d71bde
Author: Pascal Cuoq <cuoq@trust-in-soft.com>
Date: Sun May 15 09:05:46 2016 +0200
Avoid relying on undefined behavior in CVE-2015-1283 fix. It does not really work: https://godbolt.org/g/Zl8gdF
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-4472
--- expat-2.1.1/lib/xmlparse.c.cve4472
+++ expat-2.1.1/lib/xmlparse.c
@@ -1727,7 +1727,8 @@ XML_GetBuffer(XML_Parser parser, int len
}
if (len > bufferLim - bufferEnd) {
- int neededSize = len + (int)(bufferEnd - bufferPtr);
+ /* Do not invoke signed arithmetic overflow: */
+ int neededSize = (int) ((unsigned)len + (unsigned)(bufferEnd - bufferPtr));
if (neededSize < 0) {
errorCode = XML_ERROR_NO_MEMORY;
return NULL;
@@ -1759,7 +1760,8 @@ XML_GetBuffer(XML_Parser parser, int len
if (bufferSize == 0)
bufferSize = INIT_BUFFER_SIZE;
do {
- bufferSize *= 2;
+ /* Do not invoke signed arithmetic overflow: */
+ bufferSize = (int) (2U * (unsigned) bufferSize);
} while (bufferSize < neededSize && bufferSize > 0);
if (bufferSize <= 0) {
errorCode = XML_ERROR_NO_MEMORY;

12
expat.spec
View File

@ -1,10 +1,13 @@
Summary: An XML parser library
Name: expat
Version: 2.1.1
Release: 1%{?dist}
Release: 2%{?dist}
Source: http://downloads.sourceforge.net/expat/expat-%{version}.tar.bz2
URL: http://www.libexpat.org/
License: MIT
Patch0: expat-2.1.1-CVE-2016-0718.patch
Patch1: expat-2.1.1-CVE-2012-6702.patch
Patch2: expat-2.1.1-CVE-2016-4472.patch
%description
This is expat, the C library for parsing XML, written by James Clark. Expat
@ -32,6 +35,9 @@ Install it if you need to link statically with expat.
%prep
%setup -q
%patch0 -p2 -b .cve0718
%patch1 -p2 -b .cve6702
%patch2 -p1 -b .cve4472
%build
export CFLAGS="$RPM_OPT_FLAGS -fPIC"
@ -70,6 +76,10 @@ make check
%{_libdir}/lib*.a
%changelog
* Thu Jun 16 2016 Joe Orton <jorton@redhat.com> - 2.1.1-2
- add security fixes for CVE-2016-0718, CVE-2012-6702, CVE-2016-5300,
CVE-2016-4472
* Mon Apr 18 2016 David Tardon <dtardon@redhat.com> - 2.1.1-1
- new upstream release