From: Yue Tao <yue....@windriver.com> for CVE-2015-1819 Enforce the reader to run in constant memory
Signed-off-by: Yue Tao <yue....@windriver.com> --- meta/recipes-core/libxml/libxml2.inc | 1 + ...19-Enforce-the-reader-to-run-in-constant-.patch | 178 +++++++++++++++++++++ 2 files changed, 179 insertions(+) create mode 100644 meta/recipes-core/libxml/libxml2/0001-CVE-2015-1819-Enforce-the-reader-to-run-in-constant-.patch diff --git a/meta/recipes-core/libxml/libxml2.inc b/meta/recipes-core/libxml/libxml2.inc index d337bec..1c3c37d 100644 --- a/meta/recipes-core/libxml/libxml2.inc +++ b/meta/recipes-core/libxml/libxml2.inc @@ -20,6 +20,7 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \ file://python-sitepackages-dir.patch \ file://libxml-m4-use-pkgconfig.patch \ file://configure.ac-fix-cross-compiling-warning.patch \ + file://0001-CVE-2015-1819-Enforce-the-reader-to-run-in-constant-.patch \ " BINCONFIG = "${bindir}/xml2-config" diff --git a/meta/recipes-core/libxml/libxml2/0001-CVE-2015-1819-Enforce-the-reader-to-run-in-constant-.patch b/meta/recipes-core/libxml/libxml2/0001-CVE-2015-1819-Enforce-the-reader-to-run-in-constant-.patch new file mode 100644 index 0000000..8b45dcb --- /dev/null +++ b/meta/recipes-core/libxml/libxml2/0001-CVE-2015-1819-Enforce-the-reader-to-run-in-constant-.patch @@ -0,0 +1,178 @@ +From 213f1fe0d76d30eaed6e5853057defc43e6df2c9 Mon Sep 17 00:00:00 2001 +From: Daniel Veillard <veill...@redhat.com> +Date: Tue, 14 Apr 2015 17:41:48 +0800 +Subject: [PATCH] CVE-2015-1819 Enforce the reader to run in constant memory + +One of the operation on the reader could resolve entities +leading to the classic expansion issue. Make sure the +buffer used for xmlreader operation is bounded. +Introduce a new allocation type for the buffers for this effect. + +Upstream-Status: Backport +--- + buf.c | 43 ++++++++++++++++++++++++++++++++++++++++++- + include/libxml/tree.h | 3 ++- + xmlreader.c | 20 +++++++++++++++++++- + 3 files changed, 63 insertions(+), 3 deletions(-) + +diff --git a/buf.c b/buf.c +index 6efc7b6..07922ff 100644 +--- a/buf.c ++++ b/buf.c +@@ -27,6 +27,7 @@ + #include <libxml/tree.h> + #include <libxml/globals.h> + #include <libxml/tree.h> ++#include <libxml/parserInternals.h> /* for XML_MAX_TEXT_LENGTH */ + #include "buf.h" + + #define WITH_BUFFER_COMPAT +@@ -299,7 +300,8 @@ xmlBufSetAllocationScheme(xmlBufPtr buf, + if ((scheme == XML_BUFFER_ALLOC_DOUBLEIT) || + (scheme == XML_BUFFER_ALLOC_EXACT) || + (scheme == XML_BUFFER_ALLOC_HYBRID) || +- (scheme == XML_BUFFER_ALLOC_IMMUTABLE)) { ++ (scheme == XML_BUFFER_ALLOC_IMMUTABLE) || ++ (scheme == XML_BUFFER_ALLOC_BOUNDED)) { + buf->alloc = scheme; + if (buf->buffer) + buf->buffer->alloc = scheme; +@@ -458,6 +460,18 @@ xmlBufGrowInternal(xmlBufPtr buf, size_t len) { + size = buf->use + len + 100; + #endif + ++ if (buf->alloc == XML_BUFFER_ALLOC_BOUNDED) { ++ /* ++ * Used to provide parsing limits ++ */ ++ if ((buf->use + len >= XML_MAX_TEXT_LENGTH) || ++ (buf->size >= XML_MAX_TEXT_LENGTH)) { ++ xmlBufMemoryError(buf, "buffer error: text too long\n"); ++ return(0); ++ } ++ if (size >= XML_MAX_TEXT_LENGTH) ++ size = XML_MAX_TEXT_LENGTH; ++ } + if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) { + size_t start_buf = buf->content - buf->contentIO; + +@@ -739,6 +753,15 @@ xmlBufResize(xmlBufPtr buf, size_t size) + CHECK_COMPAT(buf) + + if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return(0); ++ if (buf->alloc == XML_BUFFER_ALLOC_BOUNDED) { ++ /* ++ * Used to provide parsing limits ++ */ ++ if (size >= XML_MAX_TEXT_LENGTH) { ++ xmlBufMemoryError(buf, "buffer error: text too long\n"); ++ return(0); ++ } ++ } + + /* Don't resize if we don't have to */ + if (size < buf->size) +@@ -867,6 +890,15 @@ xmlBufAdd(xmlBufPtr buf, const xmlChar *str, int len) { + + needSize = buf->use + len + 2; + if (needSize > buf->size){ ++ if (buf->alloc == XML_BUFFER_ALLOC_BOUNDED) { ++ /* ++ * Used to provide parsing limits ++ */ ++ if (needSize >= XML_MAX_TEXT_LENGTH) { ++ xmlBufMemoryError(buf, "buffer error: text too long\n"); ++ return(-1); ++ } ++ } + if (!xmlBufResize(buf, needSize)){ + xmlBufMemoryError(buf, "growing buffer"); + return XML_ERR_NO_MEMORY; +@@ -938,6 +970,15 @@ xmlBufAddHead(xmlBufPtr buf, const xmlChar *str, int len) { + } + needSize = buf->use + len + 2; + if (needSize > buf->size){ ++ if (buf->alloc == XML_BUFFER_ALLOC_BOUNDED) { ++ /* ++ * Used to provide parsing limits ++ */ ++ if (needSize >= XML_MAX_TEXT_LENGTH) { ++ xmlBufMemoryError(buf, "buffer error: text too long\n"); ++ return(-1); ++ } ++ } + if (!xmlBufResize(buf, needSize)){ + xmlBufMemoryError(buf, "growing buffer"); + return XML_ERR_NO_MEMORY; +diff --git a/include/libxml/tree.h b/include/libxml/tree.h +index 2f90717..4a9b3bc 100644 +--- a/include/libxml/tree.h ++++ b/include/libxml/tree.h +@@ -76,7 +76,8 @@ typedef enum { + XML_BUFFER_ALLOC_EXACT, /* grow only to the minimal size */ + XML_BUFFER_ALLOC_IMMUTABLE, /* immutable buffer */ + XML_BUFFER_ALLOC_IO, /* special allocation scheme used for I/O */ +- XML_BUFFER_ALLOC_HYBRID /* exact up to a threshold, and doubleit thereafter */ ++ XML_BUFFER_ALLOC_HYBRID, /* exact up to a threshold, and doubleit thereafter */ ++ XML_BUFFER_ALLOC_BOUNDED /* limit the upper size of the buffer */ + } xmlBufferAllocationScheme; + + /** +diff --git a/xmlreader.c b/xmlreader.c +index f19e123..471e7e2 100644 +--- a/xmlreader.c ++++ b/xmlreader.c +@@ -2091,6 +2091,9 @@ xmlNewTextReader(xmlParserInputBufferPtr input, const char *URI) { + "xmlNewTextReader : malloc failed\n"); + return(NULL); + } ++ /* no operation on a reader should require a huge buffer */ ++ xmlBufSetAllocationScheme(ret->buffer, ++ XML_BUFFER_ALLOC_BOUNDED); + ret->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler)); + if (ret->sax == NULL) { + xmlBufFree(ret->buffer); +@@ -3616,6 +3619,7 @@ xmlTextReaderConstValue(xmlTextReaderPtr reader) { + return(((xmlNsPtr) node)->href); + case XML_ATTRIBUTE_NODE:{ + xmlAttrPtr attr = (xmlAttrPtr) node; ++ const xmlChar *ret; + + if ((attr->children != NULL) && + (attr->children->type == XML_TEXT_NODE) && +@@ -3629,10 +3633,21 @@ xmlTextReaderConstValue(xmlTextReaderPtr reader) { + "xmlTextReaderSetup : malloc failed\n"); + return (NULL); + } ++ xmlBufSetAllocationScheme(reader->buffer, ++ XML_BUFFER_ALLOC_BOUNDED); + } else + xmlBufEmpty(reader->buffer); + xmlBufGetNodeContent(reader->buffer, node); +- return(xmlBufContent(reader->buffer)); ++ ret = xmlBufContent(reader->buffer); ++ if (ret == NULL) { ++ /* error on the buffer best to reallocate */ ++ xmlBufFree(reader->buffer); ++ reader->buffer = xmlBufCreateSize(100); ++ xmlBufSetAllocationScheme(reader->buffer, ++ XML_BUFFER_ALLOC_BOUNDED); ++ ret = BAD_CAST ""; ++ } ++ return(ret); + } + break; + } +@@ -5131,6 +5146,9 @@ xmlTextReaderSetup(xmlTextReaderPtr reader, + "xmlTextReaderSetup : malloc failed\n"); + return (-1); + } ++ /* no operation on a reader should require a huge buffer */ ++ xmlBufSetAllocationScheme(reader->buffer, ++ XML_BUFFER_ALLOC_BOUNDED); + if (reader->sax == NULL) + reader->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler)); + if (reader->sax == NULL) { +-- +1.7.9.5 + -- 1.9.1 -- _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core
