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__ __ _
___\ \/ /_ __ __ _| |_
/ _ \\ /| '_ \ / _` | __|
| __// \| |_) | (_| | |_
\___/_/\_\ .__/ \__,_|\__|
|_| XML parser
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! <blink>Expat is UNDERSTAFFED and WITHOUT FUNDING.</blink> !!
!! ~~~~~~~~~~~~ !!
!! The following topics need *additional skilled C developers* to progress !!
!! in a timely manner or at all (loosely ordered by descending priority): !!
!! !!
!! - <blink>fixing a complex non-public security issue</blink>, !!
!! - teaming up on researching and fixing future security reports and !!
!! ClusterFuzz findings with few-days-max response times in communication !!
!! in order to (1) have a sound fix ready before the end of a 90 days !!
!! grace period and (2) in a sustainable manner, !!
!! - implementing and auto-testing XML 1.0r5 support !!
!! (needs discussion before pull requests), !!
!! - smart ideas on fixing the Autotools CMake files generation issue !!
!! without breaking CI (needs discussion before pull requests), !!
!! - the Windows binaries topic (needs requirements engineering first), !!
!! - pushing migration from `int` to `size_t` further !!
!! including edge-cases test coverage (needs discussion before anything). !!
!! !!
!! For details, please reach out via e-mail to sebastian@pipping.org so we !!
!! can schedule a voice call on the topic, in English or German. !!
!! !!
!! THANK YOU! Sebastian Pipping -- Berlin, 2024-03-09 !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Release 2.6.4 Wed November 6 2024
Security fixes:
#915 CVE-2024-50602 -- Fix crash within function XML_ResumeParser
from a NULL pointer dereference by disallowing function
XML_StopParser to (stop or) suspend an unstarted parser.
A new error code XML_ERROR_NOT_STARTED was introduced to
properly communicate this situation. // CWE-476 CWE-754
Other changes:
#903 CMake: Add alias target "expat::expat"
#905 docs: Document use via CMake >=3.18 with FetchContent
and SOURCE_SUBDIR and its consequences
#902 tests: Reduce use of global parser instance
#904 tests: Resolve duplicate handler
#317 #918 tests: Improve tests on doctype closing (ex CVE-2019-15903)
#914 Fix signedness of format strings
#919 #920 Version info bumped from 10:3:9 (libexpat*.so.1.9.3)
to 11:0:10 (libexpat*.so.1.10.0); see https://verbump.de/
for what these numbers do
Infrastructure:
#907 CI: Upgrade Clang from 18 to 19
#913 CI: Drop macos-12 and add macos-15
#910 CI: Adapt to breaking changes in GitHub Actions
#898 Add missing entries to .gitignore
Special thanks to:
Hanno Böck
José Eduardo Gutiérrez Conejo
José Ricardo Cardona Quesada
Release 2.6.3 Wed September 4 2024
Security fixes:
#887 #890 CVE-2024-45490 -- Calling function XML_ParseBuffer with
len < 0 without noticing and then calling XML_GetBuffer
will have XML_ParseBuffer fail to recognize the problem
and XML_GetBuffer corrupt memory.
With the fix, XML_ParseBuffer now complains with error
XML_ERROR_INVALID_ARGUMENT just like sibling XML_Parse
has been doing since Expat 2.2.1, and now documented.
Impact is denial of service to potentially artitrary code
execution.
#888 #891 CVE-2024-45491 -- Internal function dtdCopy can have an
integer overflow for nDefaultAtts on 32-bit platforms
(where UINT_MAX equals SIZE_MAX).
Impact is denial of service to potentially artitrary code
execution.
#889 #892 CVE-2024-45492 -- Internal function nextScaffoldPart can
have an integer overflow for m_groupSize on 32-bit
platforms (where UINT_MAX equals SIZE_MAX).
Impact is denial of service to potentially artitrary code
execution.
Other changes:
#851 #879 Autotools: Sync CMake templates with CMake 3.28
#853 Autotools: Always provide path to find(1) for portability
#861 Autotools: Ensure that the m4 directory always exists.
#870 Autotools: Simplify handling of SIZEOF_VOID_P
#869 Autotools: Support non-GNU sed
#856 Autotools|CMake: Fix main() to main(void)
#865 Autotools|CMake: Fix compile tests for HAVE_SYSCALL_GETRANDOM
#863 Autotools|CMake: Stop requiring dos2unix
#854 #855 CMake: Fix check for symbols size_t and off_t
#864 docs|tests: Convert README to Markdown and update
#741 Windows: Drop support for Visual Studio <=15.0/2017
#886 Drop needless XML_DTD guards around is_param access
#885 Fix typo in a code comment
#894 #896 Version info bumped from 10:2:9 (libexpat*.so.1.9.2)
to 10:3:9 (libexpat*.so.1.9.3); see https://verbump.de/
for what these numbers do
Infrastructure:
#880 Readme: Promote the call for help
#868 CI: Fix various issues
#849 CI: Allow triggering GitHub Actions workflows manually
#851 #872 ..
#873 #879 CI: Adapt to breaking changes in GitHub Actions
Special thanks to:
Alexander Bluhm
Berkay Eren Ürün
Dag-Erling Smørgrav
Ferenc Géczi
TaiYou
Release 2.6.2 Wed March 13 2024
Security fixes:
#839 #842 CVE-2024-28757 -- Prevent billion laughs attacks with
isolated use of external parsers. Please see the commit
message of commit 1d50b80cf31de87750103656f6eb693746854aa8
for details.
Bug fixes:
#839 #841 Reject direct parameter entity recursion
and avoid the related undefined behavior
Other changes:
#847 Autotools: Fix build for DOCBOOK_TO_MAN containing spaces
#837 Add missing #821 and #824 to 2.6.1 change log
#838 #843 Version info bumped from 10:1:9 (libexpat*.so.1.9.1)
to 10:2:9 (libexpat*.so.1.9.2); see https://verbump.de/
for what these numbers do
Special thanks to:
Philippe Antoine
Tomas Korbar
and
Clang UndefinedBehaviorSanitizer
OSS-Fuzz / ClusterFuzz
Release 2.6.1 Thu February 29 2024
Bug fixes:
#817 Make tests independent of CPU speed, and thus more robust
#828 #836 Expose billion laughs API with XML_DTD defined and
XML_GE undefined, regression from 2.6.0
Other changes:
#829 Hide test-only code behind new internal macro
#833 Autotools: Reject expat_config.h.in defining SIZEOF_VOID_P
#821 #824 Autotools: Fix "make clean" for case:
./configure --without-docbook && make clean all
#819 Address compiler warnings
#832 #834 Version info bumped from 10:0:9 (libexpat*.so.1.9.0)
to 10:1:9 (libexpat*.so.1.9.1); see https://verbump.de/
for what these numbers do
Infrastructure:
#818 CI: Adapt to breaking changes in clang-format
Special thanks to:
David Hall
Snild Dolkow
Release 2.6.0 Tue February 6 2024
Security fixes:
#789 #814 CVE-2023-52425 -- Fix quadratic runtime issues with big tokens
that can cause denial of service, in partial where
dealing with compressed XML input. Applications
that parsed a document in one go -- a single call to
functions XML_Parse or XML_ParseBuffer -- were not affected.
The smaller the chunks/buffers you use for parsing
previously, the bigger the problem prior to the fix.
Backporters should be careful to no omit parts of
pull request #789 and to include earlier pull request #771,
in order to not break the fix.
#777 CVE-2023-52426 -- Fix billion laughs attacks for users
compiling *without* XML_DTD defined (which is not common).
Users with XML_DTD defined have been protected since
Expat >=2.4.0 (and that was CVE-2013-0340 back then).
Bug fixes:
#753 Fix parse-size-dependent "invalid token" error for
external entities that start with a byte order mark
#780 Fix NULL pointer dereference in setContext via
XML_ExternalEntityParserCreate for compilation with
XML_DTD undefined
#812 #813 Protect against closing entities out of order
Other changes:
#723 Improve support for arc4random/arc4random_buf
#771 #788 Improve buffer growth in XML_GetBuffer and XML_Parse
#761 #770 xmlwf: Support --help and --version
#759 #770 xmlwf: Support custom buffer size for XML_GetBuffer and read
#744 xmlwf: Improve language and URL clickability in help output
#673 examples: Add new example "element_declarations.c"
#764 Be stricter about macro XML_CONTEXT_BYTES at build time
#765 Make inclusion to expat_config.h consistent
#726 #727 Autotools: configure.ac: Support --disable-maintainer-mode
#678 #705 ..
#706 #733 #792 Autotools: Sync CMake templates with CMake 3.26
#795 Autotools: Make installation of shipped man page doc/xmlwf.1
independent of docbook2man availability
#815 Autotools|CMake: Add missing -DXML_STATIC to pkg-config file
section "Cflags.private" in order to fix compilation
against static libexpat using pkg-config on Windows
#724 #751 Autotools|CMake: Require a C99 compiler
(a de-facto requirement already since Expat 2.2.2 of 2017)
#793 Autotools|CMake: Fix PACKAGE_BUGREPORT variable
#750 #786 Autotools|CMake: Make test suite require a C++11 compiler
#749 CMake: Require CMake >=3.5.0
#672 CMake: Lowercase off_t and size_t to help a bug in Meson
#746 CMake: Sort xmlwf sources alphabetically
#785 CMake|Windows: Fix generation of DLL file version info
#790 CMake: Build tests/benchmark/benchmark.c as well for
a build with -DEXPAT_BUILD_TESTS=ON
#745 #757 docs: Document the importance of isFinal + adjust tests
accordingly
#736 docs: Improve use of "NULL" and "null"
#713 docs: Be specific about version of XML (XML 1.0r4)
and version of C (C99); (XML 1.0r5 will need a sponsor.)
#762 docs: reference.html: Promote function XML_ParseBuffer more
#779 docs: reference.html: Add HTML anchors to XML_* macros
#760 docs: reference.html: Upgrade to OK.css 1.2.0
#763 #739 docs: Fix typos
#696 docs|CI: Use HTTPS URLs instead of HTTP at various places
#669 #670 ..
#692 #703 ..
#733 #772 Address compiler warnings
#798 #800 Address clang-tidy warnings
#775 #776 Version info bumped from 9:10:8 (libexpat*.so.1.8.10)
to 10:0:9 (libexpat*.so.1.9.0); see https://verbump.de/
for what these numbers do
Infrastructure:
#700 #701 docs: Document security policy in file SECURITY.md
#766 docs: Improve parse buffer variables in-code documentation
#674 #738 ..
#740 #747 ..
#748 #781 #782 Refactor coverage and conformance tests
#714 #716 Refactor debug level variables to unsigned long
#671 Improve handling of empty environment variable value
in function getDebugLevel (without visible user effect)
#755 #774 ..
#758 #783 ..
#784 #787 tests: Improve test coverage with regard to parse chunk size
#660 #797 #801 Fuzzing: Improve fuzzing coverage
#367 #799 Fuzzing|CI: Start running OSS-Fuzz fuzzing regression tests
#698 #721 CI: Resolve some Travis CI leftovers
#669 CI: Be robust towards absence of Git tags
#693 #694 CI: Set permissions to "contents: read" for security
#709 CI: Pin all GitHub Actions to specific commits for security
#739 CI: Reject spelling errors using codespell
#798 CI: Enforce clang-tidy clean code
#773 #808 ..
#809 #810 CI: Upgrade Clang from 15 to 18
#796 CI: Start using Clang's Control Flow Integrity sanitizer
#675 #720 #722 CI: Adapt to breaking changes in GitHub Actions Ubuntu images
#689 CI: Adapt to breaking changes in Clang/LLVM Debian packaging
#763 CI: Adapt to breaking changes in codespell
#803 CI: Adapt to breaking changes in Cppcheck
Special thanks to:
Ivan Galkin
Joyce Brum
Philippe Antoine
Rhodri James
Snild Dolkow
spookyahell
Steven Garske
and
Clang AddressSanitizer
Clang UndefinedBehaviorSanitizer
codespell
GCC Farm Project
OSS-Fuzz
Sony Mobile
Release 2.5.0 Tue October 25 2022
Security fixes:
#616 #649 #650 CVE-2022-43680 -- Fix heap use-after-free after overeager
destruction of a shared DTD in function
XML_ExternalEntityParserCreate in out-of-memory situations.
Expected impact is denial of service or potentially
arbitrary code execution.
Bug fixes:
#612 #645 Fix corruption from undefined entities
#613 #654 Fix case when parsing was suspended while processing nested
entities
#616 #652 #653 Stop leaking opening tag bindings after a closing tag
mismatch error where a parser is reset through
XML_ParserReset and then reused to parse
#656 CMake: Fix generation of pkg-config file
#658 MinGW|CMake: Fix static library name
Other changes:
#663 Protect header expat_config.h from multiple inclusion
#666 examples: Make use of XML_GetBuffer and be more
consistent across examples
#648 Address compiler warnings
#667 #668 Version info bumped from 9:9:8 to 9:10:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Jann Horn
Mark Brand
Osyotr
Rhodri James
and
Google Project Zero
Release 2.4.9 Tue September 20 2022
Security fixes:
#629 #640 CVE-2022-40674 -- Heap use-after-free vulnerability in
function doContent. Expected impact is denial of service
or potentially arbitrary code execution.
Bug fixes:
#634 MinGW: Fix mis-compilation for -D__USE_MINGW_ANSI_STDIO=0
#614 docs: Fix documentation on effect of switch XML_DTD on
symbol visibility in doc/reference.html
Other changes:
#638 MinGW: Make fix-xmltest-log.sh drop more Wine bug output
#596 #625 Autotools: Sync CMake templates with CMake 3.22
#608 CMake: Migrate from use of CMAKE_*_POSTFIX to
dedicated variables EXPAT_*_POSTFIX to stop affecting
other projects
#597 #599 Windows|CMake: Add missing -DXML_STATIC to test runners
and fuzzers
#512 #621 Windows|CMake: Render .def file from a template to fix
linking with -DEXPAT_DTD=OFF and/or -DEXPAT_ATTR_INFO=ON
#611 #621 MinGW|CMake: Apply MSVC .def file when linking
#622 #624 MinGW|CMake: Sync library name with GNU Autotools,
i.e. produce libexpat-1.dll rather than libexpat.dll
by default. Filename libexpat.dll.a is unaffected.
#632 MinGW|CMake: Set missing variable CMAKE_RC_COMPILER in
toolchain file "cmake/mingw-toolchain.cmake" to avoid
error "windres: Command not found" on e.g. Ubuntu 20.04
#597 #627 CMake: Unify inconsistent use of set() and option() in
context of public build time options to take need for
set(.. FORCE) in projects using Expat by means of
add_subdirectory(..) off Expat's users' shoulders
#626 #641 Stop exporting API symbols when building a static library
#644 Resolve use of deprecated "fgrep" by "grep -F"
#620 CMake: Make documentation on variables a bit more consistent
#636 CMake: Drop leading whitespace from a #cmakedefine line in
file expat_config.h.cmake
#594 xmlwf: Fix harmless variable mix-up in function nsattcmp
#592 #593 #610 Address Cppcheck warnings
#643 Address Clang 15 compiler warnings
#642 #644 Version info bumped from 9:8:8 to 9:9:8;
see https://verbump.de/ for what these numbers do
Infrastructure:
#597 #598 CI: Windows: Start covering MSVC 2022
#619 CI: macOS: Migrate off deprecated macOS 10.15
#632 CI: Linux: Make migration off deprecated Ubuntu 18.04 work
#643 CI: Upgrade Clang from 14 to 15
#637 apply-clang-format.sh: Add support for BSD find
#633 coverage.sh: Exclude MinGW headers
#635 coverage.sh: Fix name collision for -funsigned-char
Special thanks to:
David Faure
Felix Wilhelm
Frank Bergmann
Rhodri James
Rosen Penev
Thijs Schreijer
Vincent Torri
and
Google Project Zero
Release 2.4.8 Mon March 28 2022
Other changes:
#587 pkg-config: Move "-lm" to section "Libs.private"
#587 CMake|MSVC: Fix pkg-config section "Libs"
#55 #582 CMake|macOS: Start using linker arguments
"-compatibility_version <version>" and
"-current_version <version>" in a way compatible with
GNU Libtool
#590 #591 Version info bumped from 9:7:8 to 9:8:8;
see https://verbump.de/ for what these numbers do
Infrastructure:
#589 CI: Upgrade Clang from 13 to 14
Special thanks to:
evpobr
Kai Pastor
Sam James
Release 2.4.7 Fri March 4 2022
Bug fixes:
#572 #577 Relax fix to CVE-2022-25236 (introduced with release 2.4.5)
with regard to all valid URI characters (RFC 3986),
i.e. the following set (excluding whitespace):
ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz
0123456789 % -._~ :/?#[]@ !$&'()*+,;=
Other changes:
#555 #570 #581 CMake|Windows: Store Expat version in the DLL
#577 Document consequences of namespace separator choices not just
in doc/reference.html but also in header <expat.h>
#577 Document Expat's lack of validation of namespace URIs against
RFC 3986, and that the XML 1.0r4 specification doesn't
require Expat to validate namespace URIs, and that Expat
may do more in that regard in future releases.
If you find need for strict RFC 3986 URI validation on
application level today, https://uriparser.github.io/ may
be of interest.
#579 Fix documentation of XML_EndDoctypeDeclHandler in <expat.h>
#575 Document that a call to XML_FreeContentModel can be done at
a later time from outside the element declaration handler
#574 Make hardcoded namespace URIs easier to find in code
#573 Update documentation on use of XML_POOR_ENTOPY on Solaris
#569 #571 tests: Resolve use of macros NAN and INFINITY for GNU G++
4.8.2 on Solaris.
#578 #580 Version info bumped from 9:6:8 to 9:7:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Jeffrey Walton
Johnny Jazeix
Thijs Schreijer
Release 2.4.6 Sun February 20 2022
Bug fixes:
#566 Fix a regression introduced by the fix for CVE-2022-25313
in release 2.4.5 that affects applications that (1)
call function XML_SetElementDeclHandler and (2) are
parsing XML that contains nested element declarations
(e.g. "<!ELEMENT junk ((bar|foo|xyz+), zebra*)>").
Other changes:
#567 #568 Version info bumped from 9:5:8 to 9:6:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Matt Sergeant
Samanta Navarro
Sergei Trofimovich
and
NixOS
Perl XML::Parser
Release 2.4.5 Fri February 18 2022
Security fixes:
#562 CVE-2022-25235 -- Passing malformed 2- and 3-byte UTF-8
sequences (e.g. from start tag names) to the XML
processing application on top of Expat can cause
arbitrary damage (e.g. code execution) depending
on how invalid UTF-8 is handled inside the XML
processor; validation was not their job but Expat's.
Exploits with code execution are known to exist.
#561 CVE-2022-25236 -- Passing (one or more) namespace separator
characters in "xmlns[:prefix]" attribute values
made Expat send malformed tag names to the XML
processor on top of Expat which can cause
arbitrary damage (e.g. code execution) depending
on such unexpectable cases are handled inside the XML
processor; validation was not their job but Expat's.
Exploits with code execution are known to exist.
#558 CVE-2022-25313 -- Fix stack exhaustion in doctype parsing
that could be triggered by e.g. a 2 megabytes
file with a large number of opening braces.
Expected impact is denial of service or potentially
arbitrary code execution.
#560 CVE-2022-25314 -- Fix integer overflow in function copyString;
only affects the encoding name parameter at parser creation
time which is often hardcoded (rather than user input),
takes a value in the gigabytes to trigger, and a 64-bit
machine. Expected impact is denial of service.
#559 CVE-2022-25315 -- Fix integer overflow in function storeRawNames;
needs input in the gigabytes and a 64-bit machine.
Expected impact is denial of service or potentially
arbitrary code execution.
Other changes:
#557 #564 Version info bumped from 9:4:8 to 9:5:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Ivan Fratric
Samanta Navarro
and
Google Project Zero
JetBrains
Release 2.4.4 Sun January 30 2022
Security fixes:
#550 CVE-2022-23852 -- Fix signed integer overflow
(undefined behavior) in function XML_GetBuffer
(that is also called by function XML_Parse internally)
for when XML_CONTEXT_BYTES is defined to >0 (which is both
common and default).
Impact is denial of service or more.
#551 CVE-2022-23990 -- Fix unsigned integer overflow in function
doProlog triggered by large content in element type
declarations when there is an element declaration handler
present (from a prior call to XML_SetElementDeclHandler).
Impact is denial of service or more.
Bug fixes:
#544 #545 xmlwf: Fix a memory leak on output file opening error
Other changes:
#546 Autotools: Fix broken CMake support under Cygwin
#554 Windows: Add missing files to the installer to fix
compilation with CMake from installed sources
#552 #554 Version info bumped from 9:3:8 to 9:4:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Carlo Bramini
hwt0415
Roland Illig
Samanta Navarro
and
Clang LeakSan and the Clang team
Release 2.4.3 Sun January 16 2022
Security fixes:
#531 #534 CVE-2021-45960 -- Fix issues with left shifts by >=29 places
resulting in
a) realloc acting as free
b) realloc allocating too few bytes
c) undefined behavior
depending on architecture and precise value
for XML documents with >=2^27+1 prefixed attributes
on a single XML tag a la
"<r xmlns:a='[..]' a:a123='[..]' [..] />"
where XML_ParserCreateNS is used to create the parser
(which needs argument "-n" when running xmlwf).
Impact is denial of service, or more.
#532 #538 CVE-2021-46143 (ZDI-CAN-16157) -- Fix integer overflow
on variable m_groupSize in function doProlog leading
to realloc acting as free.
Impact is denial of service or more.
#539 CVE-2022-22822 to CVE-2022-22827 -- Prevent integer overflows
near memory allocation at multiple places. Mitre assigned
a dedicated CVE for each involved internal C function:
- CVE-2022-22822 for function addBinding
- CVE-2022-22823 for function build_model
- CVE-2022-22824 for function defineAttribute
- CVE-2022-22825 for function lookup
- CVE-2022-22826 for function nextScaffoldPart
- CVE-2022-22827 for function storeAtts
Impact is denial of service or more.
Other changes:
#535 CMake: Make call to file(GENERATE [..]) work for CMake <3.19
#541 Autotools|CMake: MinGW: Make run.sh(.in) work for Cygwin
and MSYS2 by not going through Wine on these platforms
#527 #528 Address compiler warnings
#533 #543 Version info bumped from 9:2:8 to 9:3:8;
see https://verbump.de/ for what these numbers do
Infrastructure:
#536 CI: Check for realistic minimum CMake version
#529 #539 CI: Cover compilation with -m32
#529 CI: Store coverage reports as artifacts for download
#528 CI: Upgrade Clang from 11 to 13
Special thanks to:
An anonymous whitehat
Christopher Degawa
J. Peter Mugaas
Tyson Smith
and
GCC Farm Project
Trend Micro Zero Day Initiative
Release 2.4.2 Sun December 19 2021
Other changes:
#509 #510 Link againgst libm for function "isnan"
#513 #514 Include expat_config.h as early as possible
#498 Autotools: Include files with release archives:
- buildconf.sh
- fuzz/*.c
#507 #519 Autotools: Sync CMake templates with CMake 3.20
#495 #524 CMake: MinGW: Fix pkg-config section "Libs" for
- non-release build types (e.g. -DCMAKE_BUILD_TYPE=Debug)
- multi-config CMake generators (e.g. Ninja Multi-Config)
#502 #503 docs: Document that function XML_GetBuffer may return NULL
when asking for a buffer of 0 (zero) bytes size
#522 #523 docs: Fix return value docs for both
XML_SetBillionLaughsAttackProtection* functions
#525 #526 Version info bumped from 9:1:8 to 9:2:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Donghee Na
Joergen Ibsen
Kai Pastor
Release 2.4.1 Sun May 23 2021
Bug fixes:
#488 #490 Autotools: Fix installed header expat_config.h for multilib
systems; regression introduced in 2.4.0 by pull request #486
Other changes:
#491 #492 Version info bumped from 9:0:8 to 9:1:8;
see https://verbump.de/ for what these numbers do
Special thanks to:
Gentoo's QA check "multilib_check_headers"
Release 2.4.0 Sun May 23 2021
Security fixes:
#34 #466 #484 CVE-2013-0340/CWE-776 -- Protect against billion laughs attacks
(denial-of-service; flavors targeting CPU time or RAM or both,
leveraging general entities or parameter entities or both)
by tracking and limiting the input amplification factor
(<amplification> := (<direct> + <indirect>) / <direct>).
By conservative default, amplification up to a factor of 100.0
is tolerated and rejection only starts after 8 MiB of output bytes
(=<direct> + <indirect>) have been processed.
The fix adds the following to the API:
- A new error code XML_ERROR_AMPLIFICATION_LIMIT_BREACH to
signals this specific condition.
- Two new API functions ..
- XML_SetBillionLaughsAttackProtectionMaximumAmplification and
- XML_SetBillionLaughsAttackProtectionActivationThreshold
.. to further tighten billion laughs protection parameters
when desired. Please see file "doc/reference.html" for details.
If you ever need to increase the defaults for non-attack XML
payload, please file a bug report with libexpat.
- Two new XML_FEATURE_* constants ..
- that can be queried using the XML_GetFeatureList function, and
- that are shown in "xmlwf -v" output.
- Two new environment variable switches ..
- EXPAT_ACCOUNTING_DEBUG=(0|1|2|3) and
- EXPAT_ENTITY_DEBUG=(0|1)
.. for runtime debugging of accounting and entity processing.
Specific behavior of these values may change in the future.
- Two new command line arguments "-a FACTOR" and "-b BYTES"
for xmlwf to further tighten billion laughs protection
parameters when desired.
If you ever need to increase the defaults for non-attack XML
payload, please file a bug report with libexpat.
Bug fixes:
#332 #470 For (non-default) compilation with -DEXPAT_MIN_SIZE=ON (CMake)
or CPPFLAGS=-DXML_MIN_SIZE (GNU Autotools): Fix segfault
for UTF-16 payloads containing CDATA sections.
#485 #486 Autotools: Fix generated CMake files for non-64bit and
non-Linux platforms (e.g. macOS and MinGW in particular)
that were introduced with release 2.3.0
Other changes:
#468 #469 xmlwf: Improve help output and the xmlwf man page
#463 xmlwf: Improve maintainability through some refactoring
#477 xmlwf: Fix man page DocBook validity
#456 Autotools: Sync CMake templates with CMake 3.18
#458 #459 CMake: Support absolute paths for both CMAKE_INSTALL_LIBDIR
and CMAKE_INSTALL_INCLUDEDIR
#471 #481 CMake: Add support for standard variable BUILD_SHARED_LIBS
#457 Unexpose symbol _INTERNAL_trim_to_complete_utf8_characters
#467 Resolve macro HAVE_EXPAT_CONFIG_H
#472 Delete unused legacy helper file "conftools/PrintPath"
#473 #483 Improve attribution
#464 #465 #477 doc/reference.html: Fix XHTML validity
#475 #478 doc/reference.html: Replace the 90s look by OK.css
#479 Version info bumped from 8:0:7 to 9:0:8
due to addition of new symbols and error codes;
see https://verbump.de/ for what these numbers do
Infrastructure:
#456 CI: Enable periodic runs
#457 CI: Start covering the list of exported symbols
#474 CI: Isolate coverage task
#476 #482 CI: Adapt to breaking changes in image "ubuntu-18.04"
#477 CI: Cover well-formedness and DocBook/XHTML validity
of doc/reference.html and doc/xmlwf.xml
Special thanks to:
Dimitry Andric
Eero Helenius
Nick Wellnhofer
Rhodri James
Tomas Korbar
Yury Gribov
and
Clang LeakSan
JetBrains
OSS-Fuzz
Release 2.3.0 Thu March 25 2021
Bug fixes:
#438 When calling XML_ParseBuffer without a prior successful call to
XML_GetBuffer as a user, no longer trigger undefined behavior
(by adding an integer to a NULL pointer) but rather return
XML_STATUS_ERROR and set the error code to (new) code
XML_ERROR_NO_BUFFER. Found by UBSan (UndefinedBehaviorSanitizer)
of Clang 11 (but not Clang 9).
#444 xmlwf: Exit status 2 was used for both:
- malformed input files (documented) and
- invalid command-line arguments (undocumented).
The case of invalid command-line arguments now
has its own exit status 4, resolving the ambiguity.
Other changes:
#439 xmlwf: Add argument -k to allow continuing after
non-fatal errors
#439 xmlwf: Add section about exit status to the -h help output
#422 #426 #447 Windows: Drop support for Visual Studio <=14.0/2015
#434 Windows: CMake: Detect unsupported Visual Studio at
configure time (rather than at compile time)
#382 #428 testrunner: Make verbose mode (argument "-v") report
about passed tests, and make default mode report about
failures, as well.
#442 CMake: Call "enable_language(CXX)" prior to tinkering
with CMAKE_CXX_* variables
#448 Document use of libexpat from a CMake-based project
#451 Autotools: Install CMake files as generated by CMake 3.19.6
so that users with "find_package(expat [..] CONFIG [..])"
are served on distributions that are *not* using the CMake
build system inside for libexpat packaging
#436 #437 Autotools: Drop obsolescent macro AC_HEADER_STDC
#450 #452 Autotools: Resolve use of obsolete macro AC_CONFIG_HEADER
#441 Address compiler warnings
#443 Version info bumped from 7:12:6 to 8:0:7
due to addition of error code XML_ERROR_NO_BUFFER
(see https://verbump.de/ for what these numbers do)
Infrastructure:
#435 #446 Replace Travis CI by GitHub Actions
Special thanks to:
Alexander Richardson
Oleksandr Popovych
Thomas Beutlich
Tim Bray
and
Clang LeakSan, Clang 11 UBSan and the Clang team
Release 2.2.10 Sat October 3 2020
Bug fixes:
#390 #395 #398 Fix undefined behavior during parsing caused by
pointer arithmetic with NULL pointers
#404 #405 Fix reading uninitialized variable during parsing
#406 xmlwf: Add missing check for malloc NULL return
Other changes:
#396 Windows: Drop support for Visual Studio <=8.0/2005
#409 Windows: Add missing file "Changes" to the installer
to fix compilation with CMake from installed sources
#403 xmlwf: Document exit codes in xmlwf manpage and
exit with code 3 (rather than code 1) for output errors
when used with "-d DIRECTORY"
#356 #359 MinGW: Provide declaration of rand_s for mingwrt <5.3.0
#383 #392 Autotools: Use -Werror while configure tests the compiler
for supported compile flags to avoid false positives
#383 #393 #394 Autotools: Improve handling of user (C|CPP|CXX|LD)FLAGS,
e.g. ensure that they have the last word over flags added
while running ./configure
#360 CMake: Create libexpatw.{dll,so} and expatw.pc (with emphasis
on suffix "w") with -DEXPAT_CHAR_TYPE=(ushort|wchar_t)
#360 CMake: Detect and deny unsupported build combinations
involving -DEXPAT_CHAR_TYPE=(ushort|wchar_t)
#360 CMake: Install pre-compiled shipped xmlwf.1 manpage in case
of -DEXPAT_BUILD_DOCS=OFF
#375 #380 #419 CMake: Fix use of Expat by means of add_subdirectory
#407 #408 CMake: Keep expat target name constant at "expat"
(i.e. refrain from using the target name to control
build artifact filenames)
#385 CMake: Fix compilation with -DEXPAT_SHARED_LIBS=OFF for
Windows
CMake: Expose man page compilation as target "xmlwf-manpage"
#413 #414 CMake: Introduce option EXPAT_BUILD_PKGCONFIG
to control generation of pkg-config file "expat.pc"
#424 CMake: Add minimalistic support for building binary packages
with CMake target "package"; based on CPack
#366 CMake: Add option -DEXPAT_OSSFUZZ_BUILD=(ON|OFF) with
default OFF to build fuzzer code against OSS-Fuzz and
related environment variable LIB_FUZZING_ENGINE
#354 Fix testsuite for -DEXPAT_DTD=OFF and -DEXPAT_NS=OFF, each
#354 #355 ..
#356 #412 Address compiler warnings
#368 #369 Address pngcheck warnings with doc/*.png images
#425 Version info bumped from 7:11:6 to 7:12:6
Special thanks to:
asavah
Ben Wagner
Bhargava Shastry
Frank Landgraf
Jeffrey Walton
Joe Orton
Kleber Tarcísio
Ma Lin
Maciej Sroczyński
Mohammed Khajapasha
Vadim Zeitlin
and
Cppcheck 2.0 and the Cppcheck team
Release 2.2.9 Wed September 25 2019
Other changes:
examples: Drop executable bits from elements.c
#349 Windows: Change the name of the Windows DLLs from expat*.dll
to libexpat*.dll once more (regression from 2.2.8, first
fixed in 1.95.3, issue #61 on SourceForge today,
was issue #432456 back then); needs a fix due
case-insensitive file systems on Windows and the fact that
Perl's XML::Parser::Expat compiles into Expat.dll.
#347 Windows: Only define _CRT_RAND_S if not defined
Version info bumped from 7:10:6 to 7:11:6
Special thanks to:
Ben Wagner
Release 2.2.8 Fri September 13 2019
Security fixes:
#317 #318 CVE-2019-15903 -- Fix heap overflow triggered by
XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber),
and deny internal entities closing the doctype;
fixed in commit c20b758c332d9a13afbbb276d30db1d183a85d43
Bug fixes:
#240 Fix cases where XML_StopParser did not have any effect
when called from inside of an end element handler
#341 xmlwf: Fix exit code for operation without "-d DIRECTORY";
previously, only "-d DIRECTORY" would give you a proper
exit code:
# xmlwf -d . <<<'<not well-formed>' 2>/dev/null ; echo $?
2
# xmlwf <<<'<not well-formed>' 2>/dev/null ; echo $?
0
Now both cases return exit code 2.
Other changes:
#299 #302 Windows: Replace LoadLibrary hack to access
unofficial API function SystemFunction036 (RtlGenRandom)
by using official API function rand_s (needs WinXP+)
#325 Windows: Drop support for Visual Studio <=7.1/2003
and document supported compilers in README.md
#286 Windows: Remove COM code from xmlwf; in case it turns
out needed later, there will be a dedicated repository
below https://github.com/libexpat/ for that code
#322 Windows: Remove explicit MSVC solution and project files.
You can generate Visual Studio solution files through
CMake, e.g.: cmake -G"Visual Studio 15 2017" .
#338 xmlwf: Make "xmlwf -h" help output more friendly
#339 examples: Improve elements.c
#244 #264 Autotools: Add argument --enable-xml-attr-info
#239 #301 Autotools: Add arguments
--with-getrandom
--without-getrandom
--with-sys-getrandom
--without-sys-getrandom
#312 #343 Autotools: Fix linking issues with "./configure LD=clang"
Autotools: Fix "make run-xmltest" for out-of-source builds
#329 #336 CMake: Pull all options from Expat <=2.2.7 into namespace
prefix EXPAT_ with the exception of DOCBOOK_TO_MAN:
- BUILD_doc -> EXPAT_BUILD_DOCS (plural)
- BUILD_examples -> EXPAT_BUILD_EXAMPLES
- BUILD_shared -> EXPAT_SHARED_LIBS
- BUILD_tests -> EXPAT_BUILD_TESTS
- BUILD_tools -> EXPAT_BUILD_TOOLS
- DOCBOOK_TO_MAN -> DOCBOOK_TO_MAN (unchanged)
- INSTALL -> EXPAT_ENABLE_INSTALL
- MSVC_USE_STATIC_CRT -> EXPAT_MSVC_STATIC_CRT
- USE_libbsd -> EXPAT_WITH_LIBBSD
- WARNINGS_AS_ERRORS -> EXPAT_WARNINGS_AS_ERRORS
- XML_CONTEXT_BYTES -> EXPAT_CONTEXT_BYTES
- XML_DEV_URANDOM -> EXPAT_DEV_URANDOM
- XML_DTD -> EXPAT_DTD
- XML_NS -> EXPAT_NS
- XML_UNICODE -> EXPAT_CHAR_TYPE=ushort (!)
- XML_UNICODE_WCHAR_T -> EXPAT_CHAR_TYPE=wchar_t (!)
#244 #264 CMake: Add argument -DEXPAT_ATTR_INFO=(ON|OFF),
default OFF
#326 CMake: Add argument -DEXPAT_LARGE_SIZE=(ON|OFF),
default OFF
#328 CMake: Add argument -DEXPAT_MIN_SIZE=(ON|OFF),
default OFF
#239 #277 CMake: Add arguments
-DEXPAT_WITH_GETRANDOM=(ON|OFF|AUTO), default AUTO
-DEXPAT_WITH_SYS_GETRANDOM=(ON|OFF|AUTO), default AUTO
#326 CMake: Install expat_config.h to include directory
#326 CMake: Generate and install configuration files for
future find_package(expat [..] CONFIG [..])
CMake: Now produces a summary of applied configuration
CMake: Require C++ compiler only when tests are enabled
#330 CMake: Fix compilation for 16bit character types,
i.e. ex -DXML_UNICODE=ON (and ex -DXML_UNICODE_WCHAR_T=ON)
#265 CMake: Fix linking with MinGW
#330 CMake: Add full support for MinGW; to enable, use
-DCMAKE_TOOLCHAIN_FILE=[expat]/cmake/mingw-toolchain.cmake
#330 CMake: Port "make run-xmltest" from GNU Autotools to CMake
#316 CMake: Windows: Make binary postfix match MSVC
Old: expat[d].lib
New: expat[w][d][MD|MT].lib
CMake: Migrate files from Windows to Unix line endings
#308 CMake: Integrate OSS-Fuzz fuzzers, option
-DEXPAT_BUILD_FUZZERS=(ON|OFF), default OFF
#14 Drop an OpenVMS support leftover
#235 #268 ..
#270 #310 ..
#313 #331 #333 Address compiler warnings
#282 #283 ..
#284 #285 Address cppcheck warnings
#294 #295 Address Clang Static Analyzer warnings
#24 #293 Mass-apply clang-format 9 (and ensure conformance during CI)
Version info bumped from 7:9:6 to 7:10:6
Special thanks to:
David Loffredo
Joonun Jang
Kishore Kunche
Marco Maggi
Mitch Phillips
Mohammed Khajapasha
Rolf Ade
xantares
Zhongyuan Zhou
Release 2.2.7 Wed June 19 2019
Security fixes:
#186 #262 CVE-2018-20843 -- Fix extraction of namespace prefixes from
XML names; XML names with multiple colons could end up in
the wrong namespace, and take a high amount of RAM and CPU
resources while processing, opening the door to
use for denial-of-service attacks
Other changes:
#195 #197 Autotools/CMake: Utilize -fvisibility=hidden to stop
exporting non-API symbols
#227 Autotools: Add --without-examples and --without-tests
#228 Autotools: Modernize configure.ac
#245 #246 Autotools: Fix check for -fvisibility=hidden for Clang
#247 #248 Autotools: Fix compilation for lack of docbook2x-man
#236 #258 Autotools: Produce .tar.{gz,lz,xz} release archives
#212 CMake: Make libdir of pkgconfig expat.pc support multilib
#158 #263 CMake: Build man page in PROJECT_BINARY_DIR not _SOURCE_DIR
#219 Remove fallback to bcopy, assume that memmove(3) exists
#257 Use portable "/usr/bin/env bash" shebang (e.g. for OpenBSD)
#243 Windows: Fix syntax of .def module definition files
Version info bumped from 7:8:6 to 7:9:6
Special thanks to:
Benjamin Peterson
Caolán McNamara
Hanno Böck
KangLin
Kishore Kunche
Marco Maggi
Rhodri James
Sebastian Dröge
userwithuid
Yury Gribov
Release 2.2.6 Sun August 12 2018
Bug fixes:
#170 #206 Avoid doing arithmetic with NULL pointers in XML_GetBuffer
#204 #205 Fix 2.2.5 regression with suspend-resume while parsing
a document like '<root/>'
Other changes:
#165 #168 Autotools: Fix docbook-related configure syntax error
#166 Autotools: Avoid grep option `-q` for Solaris
#167 Autotools: Support
./configure DOCBOOK_TO_MAN="xmlto man --skip-validation"
#159 #167 Autotools: Support DOCBOOK_TO_MAN command which produces
xmlwf.1 rather than XMLWF.1; also covers case insensitive
file systems
#181 Autotools: Drop -rpath option passed to libtool
#188 Autotools: Detect and deny SGML docbook2man as ours is XML
#188 Autotools/CMake: Support command db2x_docbook2man as well
#174 CMake: Introduce option WARNINGS_AS_ERRORS, defaults to OFF
#184 #185 CMake: Introduce option MSVC_USE_STATIC_CRT, defaults to OFF
#207 #208 CMake: Introduce option XML_UNICODE and XML_UNICODE_WCHAR_T,
both defaulting to OFF
#175 CMake: Prefer check_symbol_exists over check_function_exists
#176 CMake: Create the same pkg-config file as with GNU Autotools
#178 #179 CMake: Use GNUInstallDirs module to set proper defaults for
install directories
#208 CMake: Utilize expat_config.h.cmake for XML_DEV_URANDOM
#180 Windows: Fix compilation of test suite for Visual Studio 2008
#131 #173 #202 Address compiler warnings
#187 #190 #200 Fix miscellaneous typos
Version info bumped from 7:7:6 to 7:8:6
Special thanks to:
Anton Maklakov
Benjamin Peterson
Brad King
Franek Korta
Frank Rast
Joe Orton
luzpaz
Pedro Vicente
Rainer Jung
Rhodri James
Rolf Ade