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The latest spec for what it essentially an XPath extension seems to be
this working draft from 2002:
https://www.w3.org/TR/xptr-xpointer/
The xpointer() scheme is listed as "being reviewed" in the XPointer
registry since at least 2006. libxml2 seems to be the only modern
software that tries to implement this spec, but the code has many bugs
and quality issues.
If you configure --with-legacy, old symbols are retained for ABI
compatibility.
Introduce xmlXPathSetErrorHandler allowing to set a structured error
handler for an XPath context.
Remove arguments from memory error handlers.
Use xmlRaiseMemoryError.
Remove TODO, STRANGE and CHECK_CTXT macros.
Remove remaining uses of xmlGenericError.
Fix many places where malloc failures aren't reported.
Rework XPath object cache to store free objects in a linked list to
avoid allocating an additional array. Remove some unneeded object pools.
Remove explicit integer casts as final operation
- in assignments
- when passing arguments
- when returning values
Remove casts
- to the same type
- from certain range-bound values
The main motivation is that these explicit casts don't change the result
of operations and only render UBSan's implicit-conversion checks
useless. Removing these casts allows UBSan to detect cases where
truncation or sign-changes occur unexpectedly.
Document some explicit casts as truncating and add a few missing ones.
Private functions were previously declared
- in header files in the root directory
- in public headers guarded with IN_LIBXML
- in libxml.h
- redundantly in source files that used them.
Consolidate all private header files in include/private.
Add a new configuration flag that controls whether the outdated support
for XPointer locations (ranges and points) is enabled.
--with-xptr-locs # Autotools
LIBXML2_WITH_XPTR_LOCS # CMake
The latest spec for what it essentially an XPath extension seems to be
this working draft from 2002:
https://www.w3.org/TR/xptr-xpointer/
The xpointer() scheme is listed as "being reviewed" in the XPointer
registry since at least 2006. libxml2 seems to be the only modern
software that tries to implement this spec, but the code has many bugs
and quality issues.
The flag defaults to "off" and support for this extensions has to be
requested explicitly. The relevant API functions are deprecated.
This code has been broken and deprecated since version 2.6.0, released
in 2003. Because of a bug in commit 961b535c, DOCBparser.c was never
compiled since 2012. I couldn't find a Debian package using any of its
symbols, so it seems safe to remove this module.
Also set ctxt->base when updating ctxt->cur. Always restore ctxt->cur
on error. Avoids integer truncation and wrong column numbers in
xmlXPathErr.
Stop hiding modification of ctxt members behind a macro.
Found with UBSan.
First set of patches for zOS
- entities.c parser.c tree.c xmlschemas.c xmlschemastypes.c xpath.c xpointer.c:
ask conversion of code to ISO Latin 1 to avoid having the compiler assume
EBCDIC codepoint for characters.
- xmlmodule.c: make sure we have support for modules
- xmlIO.c: zOS path names are special avoid dsome of the expectstions from
Unix/Windows
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.
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.
* SAX2.c dict.c error.c hash.c nanohttp.c parser.c python/libxml.c
relaxng.c runtest.c tree.c valid.c xinclude.c xmlregexp.c xmlsave.c
xmlschemas.c xpath.c xpointer.c: mostly removing unneded affectations,
but this led to a few real bugs and some part not yet understood
(relaxng/interleave)
* libxml2.syms: the symbols with history, going back to 2.4.30
* Makefile.am configure.in: linking flags detection and use
* parser.c tree.c valid.c xpointer.c: various cleanup of functions
which could be made static or simply discarded, not that many
* HTMLparser.c SAX2.c encoding.c globals.c parser.c relaxng.c
runsuite.c runtest.c schematron.c testHTML.c testReader.c
testRegexp.c testSAX.c testThreads.c valid.c xinclude.c xmlIO.c
xmllint.c xmlmodule.c xmlschemas.c xpath.c xpointer.c: a lot of
small cleanups based on Linus' sparse check output.
Daniel
* doc/apibuild.py doc/elfgcchack.xsl: revamped the elfgcchack.h
format to cope with gcc4 change of aliasing allowed scopes, had
to add extra informations to doc/libxml2-api.xml to separate
the header from the c module source.
* *.c: updated all c library files to add a #define bottom_xxx
and reimport elfgcchack.h thereafter, and a bit of cleanups.
* doc//* testapi.c: regenerated when rebuilding the API
Daniel
* gentest.py testapi.c: autogenerate a minimal NULL value sequence
for unknown pointer types
* HTMLparser.c SAX2.c chvalid.c encoding.c entities.c parser.c
parserInternals.c relaxng.c valid.c xmlIO.c xmlreader.c
xmlsave.c xmlschemas.c xmlschemastypes.c xmlstring.c xpath.c
xpointer.c: This uncovered an impressive amount of entry points
not checking for NULL pointers when they ought to, closing all
the open gaps.
Daniel
* xinclude.c: enhanced to assure that if xpointer is called
for a document, the XML_PARSE_NOENT flag is set before parsing
the included document so that entities will automatically get
taken care of.
* xpointer.c: corrected code so that, if an XML_ENTITY_REF node
is encountered, it will log it and not crash (bug 135713)
* python/generator.py, python/libxml2class.txt: fixed problem
pointed out by Stphane Bidoul on the list.
* xinclude.c, xpointer.c, xpath.c, include/libxml/xpointer.h:
completed modifications required to fix Bug 129967 (at last!).
Now wait to see how long before further trouble...
* parser.c, xmlmemory.c, include/libxml/xmlmemory.h: Fixed
memory leak reported by Dave Beckett
* xmlschemas.c: Removed spurious comment reported on the mailing
list
* xinclude.c, xpath.c, xpointer.c, libxml/include/xpointer.h:
Further work on Bug 129967 concerning xpointer range handling
and range-to function; much better, but still not complete
