Commit 2ec9db80 authored by Salvatore Bonaccorso's avatar Salvatore Bonaccorso Committed by Mattia Rizzolo

Import Debian patch 2.9.4+dfsg1-2.1

parent ea6cb3f8
libxml2 (2.9.4+dfsg1-2.1) unstable; urgency=medium
* Non-maintainer upload.
* Fix comparison with root node in xmlXPathCmpNodes
* Fix XPointer paths beginning with range-to (CVE-2016-5131)
(Closes: #840554)
* Disallow namespace nodes in XPointer ranges (CVE-2016-4658)
(Closes: #840553)
* Fix more NULL pointer derefs in xpointer.c
-- Salvatore Bonaccorso <carnil@debian.org> Sun, 30 Oct 2016 16:30:55 +0100
libxml2 (2.9.4+dfsg1-2) unstable; urgency=medium
[ YunQiang Su ]
......
From a005199330b86dada19d162cae15ef9bdcb6baa8 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 28 Jun 2016 14:19:58 +0200
Subject: [PATCH] Fix comparison with root node in xmlXPathCmpNodes
This change has already been made in xmlXPathCmpNodesExt but not in
xmlXPathCmpNodes.
---
xpath.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/xpath.c b/xpath.c
index 751665b..d992841 100644
--- a/xpath.c
+++ b/xpath.c
@@ -3342,13 +3342,13 @@ xmlXPathCmpNodes(xmlNodePtr node1, xmlNodePtr node2) {
* compute depth to root
*/
for (depth2 = 0, cur = node2;cur->parent != NULL;cur = cur->parent) {
- if (cur == node1)
+ if (cur->parent == node1)
return(1);
depth2++;
}
root = cur;
for (depth1 = 0, cur = node1;cur->parent != NULL;cur = cur->parent) {
- if (cur == node2)
+ if (cur->parent == node2)
return(-1);
depth1++;
}
--
2.10.1
From 9ab01a277d71f54d3143c2cf333c5c2e9aaedd9e Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 28 Jun 2016 14:22:23 +0200
Subject: [PATCH] Fix XPointer paths beginning with range-to
The old code would invoke the broken xmlXPtrRangeToFunction. range-to
isn't really a function but a special kind of location step. Remove
this function and always handle range-to in the XPath code.
The old xmlXPtrRangeToFunction could also be abused to trigger a
use-after-free error with the potential for remote code execution.
Found with afl-fuzz.
Fixes CVE-2016-5131.
---
result/XPath/xptr/vidbase | 13 ++++++++
test/XPath/xptr/vidbase | 1 +
xpath.c | 7 ++++-
xpointer.c | 76 ++++-------------------------------------------
4 files changed, 26 insertions(+), 71 deletions(-)
--- a/xpath.c
+++ b/xpath.c
@@ -10691,13 +10691,18 @@ xmlXPathCompPathExpr(xmlXPathParserConte
lc = 1;
break;
} else if ((NXT(len) == '(')) {
- /* Note Type or Function */
+ /* Node Type or Function */
if (xmlXPathIsNodeType(name)) {
#ifdef DEBUG_STEP
xmlGenericError(xmlGenericErrorContext,
"PathExpr: Type search\n");
#endif
lc = 1;
+#ifdef LIBXML_XPTR_ENABLED
+ } else if (ctxt->xptr &&
+ xmlStrEqual(name, BAD_CAST "range-to")) {
+ lc = 1;
+#endif
} else {
#ifdef DEBUG_STEP
xmlGenericError(xmlGenericErrorContext,
--- a/xpointer.c
+++ b/xpointer.c
@@ -1332,8 +1332,6 @@ xmlXPtrNewContext(xmlDocPtr doc, xmlNode
ret->here = here;
ret->origin = origin;
- xmlXPathRegisterFunc(ret, (xmlChar *)"range-to",
- xmlXPtrRangeToFunction);
xmlXPathRegisterFunc(ret, (xmlChar *)"range",
xmlXPtrRangeFunction);
xmlXPathRegisterFunc(ret, (xmlChar *)"range-inside",
@@ -2243,76 +2241,14 @@ xmlXPtrRangeInsideFunction(xmlXPathParse
* @nargs: the number of args
*
* Implement the range-to() XPointer function
+ *
+ * Obsolete. range-to is not a real function but a special type of location
+ * step which is handled in xpath.c.
*/
void
-xmlXPtrRangeToFunction(xmlXPathParserContextPtr ctxt, int nargs) {
- xmlXPathObjectPtr range;
- const xmlChar *cur;
- xmlXPathObjectPtr res, obj;
- xmlXPathObjectPtr tmp;
- xmlLocationSetPtr newset = NULL;
- xmlNodeSetPtr oldset;
- int i;
-
- if (ctxt == NULL) return;
- CHECK_ARITY(1);
- /*
- * Save the expression pointer since we will have to evaluate
- * it multiple times. Initialize the new set.
- */
- CHECK_TYPE(XPATH_NODESET);
- obj = valuePop(ctxt);
- oldset = obj->nodesetval;
- ctxt->context->node = NULL;
-
- cur = ctxt->cur;
- newset = xmlXPtrLocationSetCreate(NULL);
-
- for (i = 0; i < oldset->nodeNr; i++) {
- ctxt->cur = cur;
-
- /*
- * Run the evaluation with a node list made of a single item
- * in the nodeset.
- */
- ctxt->context->node = oldset->nodeTab[i];
- tmp = xmlXPathNewNodeSet(ctxt->context->node);
- valuePush(ctxt, tmp);
-
- xmlXPathEvalExpr(ctxt);
- CHECK_ERROR;
-
- /*
- * The result of the evaluation need to be tested to
- * decided whether the filter succeeded or not
- */
- res = valuePop(ctxt);
- range = xmlXPtrNewRangeNodeObject(oldset->nodeTab[i], res);
- if (range != NULL) {
- xmlXPtrLocationSetAdd(newset, range);
- }
-
- /*
- * Cleanup
- */
- if (res != NULL)
- xmlXPathFreeObject(res);
- if (ctxt->value == tmp) {
- res = valuePop(ctxt);
- xmlXPathFreeObject(res);
- }
-
- ctxt->context->node = NULL;
- }
-
- /*
- * The result is used as the new evaluation set.
- */
- xmlXPathFreeObject(obj);
- ctxt->context->node = NULL;
- ctxt->context->contextSize = -1;
- ctxt->context->proximityPosition = -1;
- valuePush(ctxt, xmlXPtrWrapLocationSet(newset));
+xmlXPtrRangeToFunction(xmlXPathParserContextPtr ctxt,
+ int nargs ATTRIBUTE_UNUSED) {
+ XP_ERROR(XPATH_EXPR_ERROR);
}
/**
From c1d1f7121194036608bf555f08d3062a36fd344b Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 28 Jun 2016 18:34:52 +0200
Subject: [PATCH] Disallow namespace nodes in XPointer ranges
Namespace nodes must be copied to avoid use-after-free errors.
But they don't necessarily have a physical representation in a
document, so simply disallow them in XPointer ranges.
Found with afl-fuzz.
Fixes CVE-2016-4658.
---
xpointer.c | 149 +++++++++++++++++++++++--------------------------------------
1 file changed, 56 insertions(+), 93 deletions(-)
diff --git a/xpointer.c b/xpointer.c
index a7b03fb..694d120 100644
--- a/xpointer.c
+++ b/xpointer.c
@@ -320,6 +320,45 @@ xmlXPtrRangesEqual(xmlXPathObjectPtr range1, xmlXPathObjectPtr range2) {
}
/**
+ * xmlXPtrNewRangeInternal:
+ * @start: the starting node
+ * @startindex: the start index
+ * @end: the ending point
+ * @endindex: the ending index
+ *
+ * Internal function to create a new xmlXPathObjectPtr of type range
+ *
+ * Returns the newly created object.
+ */
+static xmlXPathObjectPtr
+xmlXPtrNewRangeInternal(xmlNodePtr start, int startindex,
+ xmlNodePtr end, int endindex) {
+ xmlXPathObjectPtr ret;
+
+ /*
+ * Namespace nodes must be copied (see xmlXPathNodeSetDupNs).
+ * Disallow them for now.
+ */
+ if ((start != NULL) && (start->type == XML_NAMESPACE_DECL))
+ return(NULL);
+ if ((end != NULL) && (end->type == XML_NAMESPACE_DECL))
+ return(NULL);
+
+ ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+ if (ret == NULL) {
+ xmlXPtrErrMemory("allocating range");
+ return(NULL);
+ }
+ memset(ret, 0, sizeof(xmlXPathObject));
+ ret->type = XPATH_RANGE;
+ ret->user = start;
+ ret->index = startindex;
+ ret->user2 = end;
+ ret->index2 = endindex;
+ return(ret);
+}
+
+/**
* xmlXPtrNewRange:
* @start: the starting node
* @startindex: the start index
@@ -344,17 +383,7 @@ xmlXPtrNewRange(xmlNodePtr start, int startindex,
if (endindex < 0)
return(NULL);
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start;
- ret->index = startindex;
- ret->user2 = end;
- ret->index2 = endindex;
+ ret = xmlXPtrNewRangeInternal(start, startindex, end, endindex);
xmlXPtrRangeCheckOrder(ret);
return(ret);
}
@@ -381,17 +410,8 @@ xmlXPtrNewRangePoints(xmlXPathObjectPtr start, xmlXPathObjectPtr end) {
if (end->type != XPATH_POINT)
return(NULL);
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start->user;
- ret->index = start->index;
- ret->user2 = end->user;
- ret->index2 = end->index;
+ ret = xmlXPtrNewRangeInternal(start->user, start->index, end->user,
+ end->index);
xmlXPtrRangeCheckOrder(ret);
return(ret);
}
@@ -416,17 +436,7 @@ xmlXPtrNewRangePointNode(xmlXPathObjectPtr start, xmlNodePtr end) {
if (start->type != XPATH_POINT)
return(NULL);
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start->user;
- ret->index = start->index;
- ret->user2 = end;
- ret->index2 = -1;
+ ret = xmlXPtrNewRangeInternal(start->user, start->index, end, -1);
xmlXPtrRangeCheckOrder(ret);
return(ret);
}
@@ -453,17 +463,7 @@ xmlXPtrNewRangeNodePoint(xmlNodePtr start, xmlXPathObjectPtr end) {
if (end->type != XPATH_POINT)
return(NULL);
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start;
- ret->index = -1;
- ret->user2 = end->user;
- ret->index2 = end->index;
+ ret = xmlXPtrNewRangeInternal(start, -1, end->user, end->index);
xmlXPtrRangeCheckOrder(ret);
return(ret);
}
@@ -486,17 +486,7 @@ xmlXPtrNewRangeNodes(xmlNodePtr start, xmlNodePtr end) {
if (end == NULL)
return(NULL);
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start;
- ret->index = -1;
- ret->user2 = end;
- ret->index2 = -1;
+ ret = xmlXPtrNewRangeInternal(start, -1, end, -1);
xmlXPtrRangeCheckOrder(ret);
return(ret);
}
@@ -516,17 +506,7 @@ xmlXPtrNewCollapsedRange(xmlNodePtr start) {
if (start == NULL)
return(NULL);
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start;
- ret->index = -1;
- ret->user2 = NULL;
- ret->index2 = -1;
+ ret = xmlXPtrNewRangeInternal(start, -1, NULL, -1);
return(ret);
}
@@ -541,6 +521,8 @@ xmlXPtrNewCollapsedRange(xmlNodePtr start) {
*/
xmlXPathObjectPtr
xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
+ xmlNodePtr endNode;
+ int endIndex;
xmlXPathObjectPtr ret;
if (start == NULL)
@@ -549,7 +531,12 @@ xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
return(NULL);
switch (end->type) {
case XPATH_POINT:
+ endNode = end->user;
+ endIndex = end->index;
+ break;
case XPATH_RANGE:
+ endNode = end->user2;
+ endIndex = end->index2;
break;
case XPATH_NODESET:
/*
@@ -557,39 +544,15 @@ xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
*/
if (end->nodesetval->nodeNr <= 0)
return(NULL);
+ endNode = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
+ endIndex = -1;
break;
default:
/* TODO */
return(NULL);
}
- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
- if (ret == NULL) {
- xmlXPtrErrMemory("allocating range");
- return(NULL);
- }
- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
- ret->type = XPATH_RANGE;
- ret->user = start;
- ret->index = -1;
- switch (end->type) {
- case XPATH_POINT:
- ret->user2 = end->user;
- ret->index2 = end->index;
- break;
- case XPATH_RANGE:
- ret->user2 = end->user2;
- ret->index2 = end->index2;
- break;
- case XPATH_NODESET: {
- ret->user2 = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
- ret->index2 = -1;
- break;
- }
- default:
- STRANGE
- return(NULL);
- }
+ ret = xmlXPtrNewRangeInternal(start, -1, endNode, endIndex);
xmlXPtrRangeCheckOrder(ret);
return(ret);
}
--
2.10.1
From e905f08123e4a6e7731549e6f09dadff4cab65bd Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 26 Jun 2016 12:38:28 +0200
Subject: [PATCH] Fix more NULL pointer derefs in xpointer.c
Found with afl-fuzz.
---
xpointer.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/xpointer.c b/xpointer.c
index 694d120..e643ee9 100644
--- a/xpointer.c
+++ b/xpointer.c
@@ -542,7 +542,7 @@ xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
/*
* Empty set ...
*/
- if (end->nodesetval->nodeNr <= 0)
+ if ((end->nodesetval == NULL) || (end->nodesetval->nodeNr <= 0))
return(NULL);
endNode = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
endIndex = -1;
@@ -1361,7 +1361,7 @@ xmlXPtrEval(const xmlChar *str, xmlXPathContextPtr ctx) {
*/
xmlNodeSetPtr set;
set = tmp->nodesetval;
- if ((set->nodeNr != 1) ||
+ if ((set == NULL) || (set->nodeNr != 1) ||
(set->nodeTab[0] != (xmlNodePtr) ctx->doc))
stack++;
} else
@@ -2034,9 +2034,11 @@ xmlXPtrRangeFunction(xmlXPathParserContextPtr ctxt, int nargs) {
xmlXPathFreeObject(set);
XP_ERROR(XPATH_MEMORY_ERROR);
}
- for (i = 0;i < oldset->locNr;i++) {
- xmlXPtrLocationSetAdd(newset,
- xmlXPtrCoveringRange(ctxt, oldset->locTab[i]));
+ if (oldset != NULL) {
+ for (i = 0;i < oldset->locNr;i++) {
+ xmlXPtrLocationSetAdd(newset,
+ xmlXPtrCoveringRange(ctxt, oldset->locTab[i]));
+ }
}
/*
--
2.1.4
0001-modify-xml2-config-and-pkgconfig-behaviour.patch
0002-fix-python-multiarch-includes.patch
0003-Fix-NULL-pointer-deref-in-XPointer-range-to.patch
0004-Fix-comparison-with-root-node-in-xmlXPathCmpNodes.patch
0005-Fix-XPointer-paths-beginning-with-range-to.patch
0006-Disallow-namespace-nodes-in-XPointer-ranges.patch
0007-Fix-more-NULL-pointer-derefs-in-xpointer.c.patch
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