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01/02: gnu: libxml2: Fix CVE-2016-4658.
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From: |
Leo Famulari |
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Subject: |
01/02: gnu: libxml2: Fix CVE-2016-4658. |
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Date: |
Sun, 25 Dec 2016 00:19:49 +0000 (UTC) |
lfam pushed a commit to branch master
in repository guix.
commit 0c83c6bf2669367e81012391b5bc4ab0406ffbf3
Author: Leo Famulari <address@hidden>
Date: Sat Dec 24 19:09:03 2016 -0500
gnu: libxml2: Fix CVE-2016-4658.
* gnu/packages/xml.scm (libxml2)[replacement]: New field.
(libxml2/fixed): New variable.
* gnu/packages/patches/libxml2-CVE-2016-4658.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
---
gnu/local.mk | 1 +
gnu/packages/patches/libxml2-CVE-2016-4658.patch | 257 ++++++++++++++++++++++
gnu/packages/xml.scm | 9 +
3 files changed, 267 insertions(+)
diff --git a/gnu/local.mk b/gnu/local.mk
index ee8f1e5..a1137cf 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -696,6 +696,7 @@ dist_patch_DATA =
\
%D%/packages/patches/libwmf-CVE-2015-0848+CVE-2015-4588.patch \
%D%/packages/patches/libwmf-CVE-2015-4695.patch \
%D%/packages/patches/libwmf-CVE-2015-4696.patch \
+ %D%/packages/patches/libxml2-CVE-2016-4658.patch \
%D%/packages/patches/libxslt-generated-ids.patch \
%D%/packages/patches/libxslt-CVE-2016-4738.patch \
%D%/packages/patches/linux-pam-no-setfsuid.patch \
diff --git a/gnu/packages/patches/libxml2-CVE-2016-4658.patch
b/gnu/packages/patches/libxml2-CVE-2016-4658.patch
new file mode 100644
index 0000000..a4e1f31
--- /dev/null
+++ b/gnu/packages/patches/libxml2-CVE-2016-4658.patch
@@ -0,0 +1,257 @@
+Fix CVE-2016-4658:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4658
+
+Patch copied from upstream source repository:
+
+https://git.gnome.org/browse/libxml2/commit/?id=c1d1f7121194036608bf555f08d3062a36fd344b
+
+From c1d1f7121194036608bf555f08d3062a36fd344b Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <address@hidden>
+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 a7b03fbd..694d120e 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);
+ }
+--
+2.11.0
+
diff --git a/gnu/packages/xml.scm b/gnu/packages/xml.scm
index 594a1a4..d821338 100644
--- a/gnu/packages/xml.scm
+++ b/gnu/packages/xml.scm
@@ -74,6 +74,7 @@ things the parser might find in the XML document (like start
tags).")
(define-public libxml2
(package
(name "libxml2")
+ (replacement libxml2/fixed)
(version "2.9.4")
(source (origin
(method url-fetch)
@@ -101,6 +102,14 @@ things the parser might find in the XML document (like
start tags).")
project (but it is usable outside of the Gnome platform).")
(license license:x11)))
+(define libxml2/fixed
+ (package
+ (inherit libxml2)
+ (source
+ (origin
+ (inherit (package-source libxml2))
+ (patches (search-patches "libxml2-CVE-2016-4658.patch"))))))
+
(define-public python-libxml2
(package (inherit libxml2)
(name "python-libxml2")