path: root/release_docs/RELEASE.txt

HDF5 version 1.10.11-1 currently under development
================================================================================


INTRODUCTION
============

This document describes the differences between this release and the previous
HDF5 release. It contains information on the platforms tested and known
problems in this release. For more details check the HISTORY*.txt files in the
HDF5 source.

Note that documentation in the links below will be updated at the time of each
final release.

Links to HDF5 documentation can be found on The HDF5 web page:

     https://portal.hdfgroup.org/display/HDF5/HDF5

The official HDF5 releases can be obtained from:

     https://www.hdfgroup.org/downloads/hdf5/

Changes from Release to Release and New Features in the HDF5-1.10.x release series
can be found at:

     https://portal.hdfgroup.org/display/HDF5/Release+Specific+Information

If you have any questions or comments, please send them to the HDF Help Desk:

     help@hdfgroup.org


CONTENTS
========

- New Features
- Support for new platforms and languages
- Bug Fixes since HDF5-1.10.10
- Supported Platforms
- Tested Configuration Features Summary
- More Tested Platforms
- Known Problems
- CMake vs. Autotools installations


New Features
============

    Configuration:
    -------------
    - Added support for CMake presets file.

      CMake supports two main files, CMakePresets.json and CMakeUserPresets.json,
      that allow users to specify common configure options and share them with others.
      HDF added a CMakePresets.json file of a typical configuration and support
      file, config/cmake-presets/hidden-presets.json. 
      Also added a section to INSTALL_CMake.txt with very basic explanation of the
      process to use CMakePresets.

    - Enabled instrumentation of the library by default in CMake for parallel
      debug builds

      HDF5 can be configured to instrument portions of the parallel library to
      aid in debugging. Autotools builds of HDF5 turn this capability on by
      default for parallel debug builds and off by default for other build types.
      CMake has been updated to match this behavior.


    Library:
    --------
    - Change the error handling for a not found path in the find plugin process.

      While attempting to load a plugin the HDF5 library will fail if one of the
      directories in the plugin paths does not exist, even if there are more paths
      to check. Instead of exiting the function with an error, just logged the error
      and continue processing the list of paths to check.


    Parallel Library:
    -----------------
    -


    Fortran Library:
    ----------------
    -


    C++ Library:
    ------------
    -


    Java Library:
    -------------
    - HDF5GroupInfo class has been deprecated.

      This class assumes that an object can contain four values which uniquely identify an
      object among those HDF5 files which are open. This is no longer valid in future
      HDF5 releases.


    Tools:
    ------
    -


    High-Level APIs:
    ----------------
    -


    C Packet Table API:
    -------------------
    -


    Internal header file:
    ---------------------
    -


    Documentation:
    --------------
    -


Support for new platforms, languages and compilers
==================================================
    -


Bug Fixes since HDF5-1.10.10 release
===================================
    Library
    -------
    - Seg fault on file close

      h5debug fails at file close with core dump on a file that has an
      illegal file size in its cache image.  In H5F__dest(), the library
      performs all the closing operations for the file and keeps track of
      the error encountered when reading the file cache image.  
      At the end of the routine, it frees the file's file structure and 
      returns error.  Due to the error return, the file object is not removed 
      from the ID node table.  This eventually causes assertion failure in 
      H5F__close_cb() when the library finally exits and tries to 
      access that file object in the table for closing.

      The closing routine, H5F__dest(), will not free the file structure if
      there is error, keeping a valid file structure in the ID node table.
      It will be freed later in H5F__close_cb() when the library exits and 
      terminates the file package.

      Fix for HDFFV-11052, CVE-2020-10812

    - Fixed memory leaks that could occur when reading a dataset from a
      malformed file

      When attempting to read layout, pline, and efl information for a
      dataset, memory leaks could occur if attempting to read pline/efl
      information threw an error, which is due to the memory that was 
      allocated for pline and efl not being properly cleaned up on error.  

      Fixes Github issue #2602

    - Fixed a bug in H5Ocopy that could generate invalid HDF5 files

      H5Ocopy was missing a check to determine whether the new object's
      object header version is greater than version 1. Without this check,
      copying of objects with object headers that are smaller than a
      certain size would cause H5Ocopy to create an object header for the
      new object that has a gap in the header data. According to the
      HDF5 File Format Specification, this is not allowed for version
      1 of the object header format.

      Fixes GitHub issue #2653

    - Fixed potential heap buffer overflow in decoding of link info message

      Detections of buffer overflow were added for decoding version, index
      flags, link creation order value, and the next three addresses.  The
      checkings will remove the potential invalid read of any of these
      values that could be triggered by a malformed file.

      Fixes GitHub issue #2603

    - Fixed potential buffer overrun issues in some object header decode routines

      Several checks were added to H5O__layout_decode and H5O__sdspace_decode to
      ensure that memory buffers don't get overrun when decoding buffers read from
      a (possibly corrupted) HDF5 file.

    - Fixed a heap buffer overflow that occurs when reading from
      a dataset with a compact layout within a malformed HDF5 file

      During opening of a dataset that has a compact layout, the
      library allocates a buffer that stores the dataset's raw data.
      The dataset's object header that gets written to the file
      contains information about how large of a buffer the library
      should allocate. If this object header is malformed such that
      it causes the library to allocate a buffer that is too small
      to hold the dataset's raw data, future I/O to the dataset can
      result in heap buffer overflows. To fix this issue, an extra
      check is now performed for compact datasets to ensure that
      the size of the allocated buffer matches the expected size
      of the dataset's raw data (as calculated from the dataset's
      dataspace and datatype information). If the two sizes do not
      match, opening of the dataset will fail.

      Fixes GitHub issue #2606

    - Fix for CVE-2019-8396

      Malformed HDF5 files may have truncated content which does not match
      the expected size. When H5O__pline_decode() attempts to decode these it
      may read past the end of the allocated space leading to heap overflows
      as bounds checking is incomplete.

      The fix ensures each element is within bounds before reading.

      Fixes Jira issue HDFFV-10712, CVE-2019-8396, GitHub issue #2209

    - Memory leak

      Memory leak was detected when running h5dump with "pov".  The memory was allocated
      via H5FL__malloc() in hdf5/src/H5FL.c

      The fuzzed file "pov" was an HDF5 file containing an illegal continuation message.
      When deserializing the object header chunks for the file, memory is allocated for the
      array of continuation messages (cont_msg_info->msgs) in continuation message info struct.
      As error is encountered in loading the illegal message, the memory allocated for
      cont_msg_info->msgs needs to be freed.

      Fix for GitHub issue #2599


    Java Library
    ------------
    - Fixed switch case 'L' block missing a break statement.

      The HDF5Array.arrayify method is missing a break statement in the case 'L': section
      which causes it to fall through and throw an HDF5JavaException when attempting to
      read an Array[Array[Long]].

      The error was fixed by inserting a break statement at the end of the case 'L': sections.

      Fixes GitHub issue #3056


    Configuration
    -------------
    - Fixed syntax of generator expressions used by CMake

      Adding quotes around the generator expression should allow CMake to
      correctly parse the expression. Generator expressions are typically
      parsed after command arguments. If a generator expression contains
      spaces, new lines, semicolons or other characters that may be
      interpreted as command argument separators, the whole expression
      should be surrounded by quotes when passed to a command. Failure to
      do so may result in the expression being split and it may no longer
      be recognized as a generator expression.

      Fixes GitHub issue #2906


    Tools
    -----
    - Names of objects with square brackets will have trouble without the
      special argument, --no-compact-subset, on the h5dump command line.

      h5diff did not have this option and now it has been added.

      Fix for GitHub issue #2682


    Performance
    -------------
    -


    Fortran API
    -----------
    -


    High-Level Library
    ------------------
    -


    Fortran High-Level APIs
    -----------------------
    -


    Documentation
    -------------
    -


    F90 APIs
    --------
    -


    C++ APIs
    --------
    - 


    Testing
    -------
    -


Platforms Tested
===================

    Linux 5.13.14-200.fc34           GNU gcc (GCC) 11.2.1 2021078 (Red Hat 11.2.1-1)
    #1 SMP x86_64  GNU/Linux         GNU Fortran (GCC) 11.2.1 2021078 (Red Hat 11.2.1-1)
    Fedora34                         clang version 12.0.1 (Fedora 12.0.1-1.fc34)
                                     (cmake and autotools)

    Linux 5.11.0-34-generic          GNU gcc (GCC) 9.3.0-17ubuntu1
    #36-Ubuntu SMP x86_64 GNU/Linux  GNU Fortran (GCC) 9.3.0-17ubuntu1
    Ubuntu 20.04                     Ubuntu clang version 10.0.0-4
                                     (cmake and autotools)

    Linux 5.8.0-63-generic           GNU gcc (GCC) 10.3.0-1ubuntu1
    #71-Ubuntu SMP x86_64 GNU/Linux  GNU Fortran (GCC) 10.3.0-1ubuntu1
    Ubuntu20.10                      Ubuntu clang version 11.0.0-2
                                     (cmake and autotools)

    Linux 5.3.18-22-default          GNU gcc (SUSE Linux) 7.5.0
    #1 SMP x86_64  GNU/Linux         GNU Fortran (SUSE Linux) 7.5.0
    SUSE15sp2                        clang version 7.0.1 (tags/RELEASE_701/final 349238)
                                     (cmake and autotools)

    Linux-4.14.0-115.21.2            spectrum-mpi/rolling-release
    #1 SMP ppc64le GNU/Linux             clang 8.0.1, 11.0.1
    (lassen)                             GCC 7.3.1
                                         XL 16.1.1.2
                                     (cmake)

    Linux-4.12.14-150.75-default     cray-mpich/7.7.10
    #1 SMP x86_64 GNU/Linux              GCC 7.3.0, 8.2.0
    (cori)                               Intel (R) Version 19.0.3.199
                                     (cmake)

    Linux-4.12.14-197.86-default     cray-mpich/7.7.6
    # 1SMP x86_64 GNU/Linux              GCC  7.3.0, 9.3.0, 10.2.0
    (mutrino)                            Intel (R) Version 17.0.4, 18.0.5, 19.1.3
                                     (cmake)

    Linux 3.10.0-1160.36.2.el7.ppc64 gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
    #1 SMP ppc64be GNU/Linux         g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
    Power8 (echidna)                 GNU Fortran (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)

    Linux 3.10.0-1160.24.1.el7       GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP x86_64 GNU/Linux          compilers:
    Centos7                              Version 4.8.5 20150623 (Red Hat 4.8.5-4)
    (jelly/kituo/moohan)                 Version 4.9.3, Version 5.3.0, Version 6.3.0,
                                         Version 7.2.0, Version 8.3.0, Version 9.1.0
                                     Intel(R) C (icc), C++ (icpc), Fortran (icc)
                                     compilers:
                                         Version 17.0.0.098 Build 20160721
                                     GNU C (gcc) and C++ (g++) 4.8.5 compilers
                                         with NAG Fortran Compiler Release 6.1(Tozai)
                                     Intel(R) C (icc) and C++ (icpc) 17.0.0.098 compilers
                                         with NAG Fortran Compiler Release 6.1(Tozai)
                                     MPICH 3.1.4 compiled with GCC 4.9.3
                                     MPICH 3.3 compiled with GCC 7.2.0
                                     OpenMPI 2.1.6 compiled with icc 18.0.1
                                     OpenMPI 3.1.3 and 4.0.0 compiled with GCC 7.2.0
                                     PGI C, Fortran, C++ for 64-bit target on
                                     x86_64;
                                         Version 19.10-0

    Linux-3.10.0-1127.0.0.1chaos     openmpi-4.0.0
    #1 SMP x86_64 GNU/Linux              clang 6.0.0, 11.0.1
    (quartz)                             GCC 7.3.0, 8.1.0
                                         Intel 16.0.4, 18.0.2, 19.0.4

    macOS Apple M1 11.6              Apple clang version 12.0.5 (clang-1205.0.22.11)
    Darwin 20.6.0 arm64              gfortran GNU Fortran (Homebrew GCC 11.2.0) 11.1.0
    (macmini-m1)                     Intel icc/icpc/ifort version 2021.3.0 20210609

    macOS Big Sur 11.3.1             Apple clang version 12.0.5 (clang-1205.0.22.9)
    Darwin 20.4.0 x86_64             gfortran GNU Fortran (Homebrew GCC 10.2.0_3) 10.2.0
    (bigsur-1)                       Intel icc/icpc/ifort version 2021.2.0 20210228

    macOS High Sierra 10.13.6        Apple LLVM version 10.0.0 (clang-1000.10.44.4)
    64-bit                           gfortran GNU Fortran (GCC) 6.3.0
    (bear)                           Intel icc/icpc/ifort version 19.0.4.233 20190416

    macOS Sierra 10.12.6             Apple LLVM version 9.0.0 (clang-900.39.2)
    64-bit                           gfortran GNU Fortran (GCC) 7.4.0
    (kite)                           Intel icc/icpc/ifort version 17.0.2

    Mac OS X El Capitan 10.11.6      Apple clang version 7.3.0 from Xcode 7.3
    64-bit                           gfortran GNU Fortran (GCC) 5.2.0
    (osx1011test)                    Intel icc/icpc/ifort version 16.0.2

    Linux 2.6.32-573.22.1.el6        GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP x86_64 GNU/Linux          compilers:
    Centos6                              Version 4.4.7 20120313
    (platypus)                           Version 4.9.3, 5.3.0, 6.2.0
                                     MPICH 3.1.4 compiled with GCC 4.9.3
                                     PGI C, Fortran, C++ for 64-bit target on
                                     x86_64;
                                         Version 19.10-0

    Windows 10 x64                  Visual Studio 2015 w/ Intel C/C++/Fortran 18 (cmake)
                                    Visual Studio 2017 w/ Intel C/C++/Fortran 19 (cmake)
                                    Visual Studio 2019 w/ clang 12.0.0
                                        with MSVC-like command-line (C/C++ only - cmake)
                                    Visual Studio 2019 
                                        w/ Intel C/C++/Fortran oneAPI 2021 (cmake)
                                    Visual Studio 2019 w/ MSMPI 10.1 (C only - cmake)


Known Problems
==============
    Setting a variable-length dataset fill value will leak the memory allocated
    for the p field of the hvl_t struct. A fix is in progress for this.
    HDFFV-10840

    CMake files do not behave correctly with paths containing spaces.
    Do not use spaces in paths because the required escaping for handling spaces
    results in very complex and fragile build files.
    ADB - 2019/05/07

    At present, metadata cache images may not be generated by parallel
    applications.  Parallel applications can read files with metadata cache
    images, but since this is a collective operation, a deadlock is possible
    if one or more processes do not participate.

    Two tests fail attempting collective writes with OpenMPI 3.0.0/GCC-7.2.0-2.29:
        testphdf5 (ecdsetw, selnone, cchunk1, cchunk3, cchunk4, and actualio)
        t_shapesame (sscontig2)

    CPP ptable test fails on both VS2017 and VS2019 with Intel compiler, JIRA
    issue: HDFFV-10628.  This test will pass with VS2015 with Intel compiler.

    The subsetting option in ph5diff currently will fail and should be avoided.
    The subsetting option works correctly in serial h5diff.

    Known problems in previous releases can be found in the HISTORY*.txt files
    in the HDF5 source. Please report any new problems found to
    help@hdfgroup.org.


CMake vs. Autotools installations
=================================
While both build systems produce similar results, there are differences.
Each system produces the same set of folders on linux (only CMake works
on standard Windows); bin, include, lib and share. Autotools places the
COPYING and RELEASE.txt file in the root folder, CMake places them in
the share folder.

The bin folder contains the tools and the build scripts. Additionally, CMake
creates dynamic versions of the tools with the suffix "-shared". Autotools
installs one set of tools depending on the "--enable-shared" configuration
option.
  build scripts
  -------------
  Autotools: h5c++, h5cc, h5fc
  CMake: h5c++, h5cc, h5hlc++, h5hlcc

The include folder holds the header files and the fortran mod files. CMake
places the fortran mod files into separate shared and static subfolders,
while Autotools places one set of mod files into the include folder. Because
CMake produces a tools library, the header files for tools will appear in
the include folder.

The lib folder contains the library files, and CMake adds the pkgconfig
subfolder with the hdf5*.pc files used by the bin/build scripts created by
the CMake build. CMake separates the C interface code from the fortran code by
creating C-stub libraries for each Fortran library. In addition, only CMake
installs the tools library. The names of the szip libraries are different
between the build systems.

The share folder will have the most differences because CMake builds include
a number of CMake specific files for support of CMake's find_package and support
for the HDF5 Examples CMake project.

The issues with the gif tool are:
    HDFFV-10592 CVE-2018-17433
    HDFFV-10593 CVE-2018-17436
    HDFFV-11048 CVE-2020-10809
These CVE issues have not yet been addressed and can be avoided by not building
the gif tool. Disable building the High-Level tools with these options:
    autotools:   --disable-hltools
    cmake:       HDF5_BUILD_HL_TOOLS=OFF