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upx/NEWS.md
Markus F.X.J. Oberhumer b8d9c2b755 all: assorted updates and cleanups
2023-02-05 17:20:32 +01:00

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==================================================================

User visible changes for UPX

==================================================================

Changes in 4.0.3 (XX XXX 2023):

Changes in 4.0.2 (30 Jan 2023):

Changes in 4.0.1 (16 Nov 2022):

Changes in 4.0.0 (28 Oct 2022):

  • Switch to semantic versioning
  • SECURITY NOTES: emphasize the security context in the docs
  • Support easy building from source code with CMake
  • Support easy rebuilding the stubs from source with Podman/Docker
  • Add integrated doctest C++ testing framework
  • Add support for EFI files (PE x86; Kornel Pal)
  • win32/pe and win64/pe: set correct SizeOfHeaders in the PE header
  • bug fixes - see https://github.com/upx/upx/milestone/6
  • bug fixes - see https://github.com/upx/upx/milestone/7

Changes in 3.96 (23 Jan 2020):

Changes in 3.95 (26 Aug 2018):

  • Flag --android-shlib to work around bad design in Android
  • Flag --force-pie when ET_DYN main program is not marked as DF_1_PIE
  • Better compatibility with varying layout of address space on Linux
  • Support for 4 PT_LOAD layout in ELF generated by binutils-2.31
  • bug fixes, particularly better diagnosis of malformed input
  • bug fixes - see https://github.com/upx/upx/milestone/4

Changes in 3.94 (12 May 2017):

  • Add support for arm64-linux (aka "aarch64").
  • Add support for --lzma compression on 64-bit PowerPC (Thierry Fauck).
  • For Mach, "upx -d" will unpack a prefix of the file (and warn).
  • Various improvements to the ELF formats.
  • bug fixes - see https://github.com/upx/upx/milestone/3

Changes in 3.93 (29 Jan 2017):

Changes in 3.92 (11 Dec 2016):

  • INFO: UPX has moved to GitHub - the new home page is https://upx.github.io
  • IMPORTANT: all PE formats: internal changes: reunited the diverged source files - please report all regressions into the bug tracker and try UPX 3.91 in case of problems.
  • Support Apple MacOS 10.12 "Sierra", including more-robust de-compression.
  • Explicitly diagnose Go-language bad PT_LOAD; recommend hemfix.c. https://sourceforge.net/p/upx/bugs/195/ https://github.com/pwaller/goupx
  • Fix CERT-FI Case 829767 UPX command line tools segfaults. Received by UPX Team on 2015-May-08; originally reported by Codenomicon to NCSC-FI on 2015-01-08. The vulnerabilities were discovered by Joonas Kuorilehto and Antti Häyrynen from Codenomicon.
  • bug fixes - see https://github.com/upx/upx/milestone/1

Changes in 3.91 (30 Sep 2013):

  • Added experimental support for Windows 64-bit PE files, based on work by Stefan Widmann. Please use for testing only!
  • bug fixes

==================================================================

Changes in 3.09 (18 Feb 2013):

  • New option --preserve-build-id for GNU ELF.
  • Allow for code signing and LC_UUID on Mac OS X executables.
  • Allow non-contiguous LC_SEGMENTs and 0==.vmsize for Mach-O.
  • Allow zero-filled final page in PackUnix::canUnpack().
  • bug fixes

Changes in 3.08 (12 Dec 2011):

  • Fix allocation in runtime stub for darwin.macho-entry (i386 and amd64).
  • Compress shared library on ELF i386 only [ld.so threatens even this case].
  • Attempt to support ELF on QNX 6.3.0 for armel (experimental).
  • Better diagnostic when ELF -fPIC is needed.
  • PT_NOTE improvements for BSD.
  • Preserve more ELF .e_flags on ARM.
  • Minor code improvements for ELF stubs.
  • Defend against another flavor of corrupt PE header.
  • bug fixes

Changes in 3.07 (08 Sep 2010):

  • win32/pe: fixed relocation handling for files with no TLS callbacks [severe bug introduced in 3.06]

Changes in 3.06 (04 Sep 2010):

  • win32/pe: TLS callback support contributed by Stefan Widmann. Thanks!
  • bug fixes

Changes in 3.05 (27 Apr 2010):

  • i386-linux and amd64-linux support shared libraries (DT_INIT must exist, all info needed by runtime loader must be first in .text, etc.)
  • Linux /proc/self/exe now is preserved by default, by leaving behind one page. New compress-time option --unmap-all-pages is available.
  • Withdraw support for shared libraries on Darwin (Apple Mac OS X) because upx does not understand enough about .dylib.
  • bug fixes

Changes in 3.04 (27 Sep 2009):

  • new format Mach/AMD64 supports 64-bit programs on Apple Macintosh.
  • new formats Dylib/i386 and Dylib/ppc32 support shared libraries [such as browser plugins] on Darwin (Apple Macintosh). An existing -init function (LC_ROUTINES command) is required.
  • new format vmlinuz/armel for Debian NSLU2 (etc.) linux kernel
  • bvmlinuz boot protocol 2.08 for 386 Linux kernel
  • Extended ABI version 4 for armel-eabi ARM Linux ELF
  • bug fixes

Changes in 3.03 (27 Apr 2008):

  • implement cache flushing for PowerPC (esp. model 440)
  • fix cache flushing on MIPS (>3 MiB compressed, or with holes)
  • fix MIPS big-endian
  • bug fixes

Changes in 3.02 (16 Dec 2007):

  • fix unmapping on arm-linux.elf
  • fix error checking in mmap for i386-linux.elf [triggered by -fPIE]
  • bug fixes

Changes in 3.01 (31 Jul 2007):

  • new options --no-mode, --no-owner and --no-time to disable preservation of mode (file permissions), file ownership and timestamps.
  • dos/exe: fixed an incorrect error message caused by a bug in relocation handling
  • new format linux/mipsel supports ELF on [32-bit] R3000
  • fix argv[0] on PowerPC with --lzma
  • bug fixes

Changes in 3.00 (27 Apr 2007):

  • watcom/le & tmt/adam: fixed a problem when using certain filters

Changes in 2.93 beta (08 Mar 2007):

  • new formats Mach/i386 and Mach/fat support Mac OS X i686 and Universal binaries [i686 and PowerPC only]
  • dos/exe: LZMA is now also supported for 16-bit dos/exe. Please note that you have to explicitly use '--lzma' even for '--ultra-brute' here because runtime decompression is about 30 times slower than NRV - which is really noticeable on old machines.
  • dos/exe: fixed a rarely occurring bug in relocation handling
  • win32/pe & arm/pe: better icon compression handling

Changes in 2.92 beta (23 Jan 2007):

  • new option '--ultra-brute' which tries even more variants
  • slightly improved compression ratio for some files when using '--brute' or '--ultra-brute'
  • bug fixes

Changes in 2.91 beta (29 Nov 2006):

  • assorted bug fixes
  • arm/pe: fix "missing" icon & version info resource problem for wince 5
  • win32/pe & arm/pe: added option --compress-icons=3 to compress all icons

Changes in 2.90 beta (08 Oct 2006):

  • LZMA algorithm support for most of the 32-bit and 64-bit file formats; use new option '--lzma' to enable
  • new format: BSD/elf386 supporting FreeBSD, NetBSD and OpenBSD via auto-detection of PT_NOTE or EI_OSABI
  • arm/pe: all the NRV compression methods are now supported (only NRV2D is missing in thumb mode)
  • linux/elf386, linux/ElfAMD: remember /proc/self/exe in environment
  • major source code changes: the runtime decompression stubs are now built from internal ELF objects

==================================================================

Changes in 2.03 (07 Nov 2006):

  • bvmlinuz/386: fix for kernels not at 0x100000; also allow x86_64
  • linux/elf386: work around Linux kernel bug (0-length .bss needs PF_W)

Changes in 2.02 (13 Aug 2006):

  • linux/386: work around Linux kernel bug (".bss" requires PF_W)
  • linux/ppc32, mach/ppc32: compressed programs now work on a 405 CPU
  • vmlinuz/386: fixed zlib uncompression problem on DOS

Changes in 2.01 (06 Jun 2006):

  • arm/pe: better DLL support
  • dos/exe: device driver support added
  • linux/386: Fix --force-execve for PaX, grSecurity, and strict SELinux. /tmp must support execve(); therefore /tmp cannot be mounted 'noexec'.
  • win32/pe & arm/pe: added new option '--keep-resource=' for excluding selected resources from compression

Changes in 2.00 (27 Apr 2006):

  • linux/386: the stub now prints an error message if some strict SELinux mode does prevent runtime decompression and execution (for a fully SELinux-compatible but otherwise inferior compression format you can use the '--force-execve' option)
  • linux/386: worked around a problem where certain Linux kernels clobber the %ebx register during a syscall
  • win32/pe: disable filters for files with broken PE headers

Changes in 1.96 beta (13 Apr 2006):

  • arm/pe: added filter support
  • win32/pe: removed an unnecessary check so that Delphi 2006 and Digital Mars C++ programs finally are supported

Changes in 1.95 beta (09 Apr 2006):

  • arm/pe: added DLL support
  • arm/pe: added thumb mode stub support
  • arm/pe: added unpacking support
  • win32/pe: really worked around R6002 runtime errors

Changes in 1.94 beta (11 Mar 2006):

  • new format: added support for arm/pe (ARM executables running on WinCE)
  • new format: added support for linux elf/amd64
  • new format: added support for linux elf/ppc32
  • new format: added support for mach/ppc32 (Apple Mac OS X)
  • win32/pe: hopefully working "load config" support
  • win32/pe: R6002 runtime errors worked around
  • win32/pe: the stub now clears the dirty stack

Changes in 1.93 beta (07 Feb 2005):

  • vmlinuz/386: fixes to support more kernels

Changes in 1.92 beta (20 Jul 2004):

  • win32/pe: added option '--strip-loadconf' to strip the SEH load config section [NOTE: this option is obsolete since UPX 1.94]
  • win32/pe: try to detect .NET (win32/net) files [not yet supported by UPX]
  • vmlinux/386: new format that directly supports building Linux kernels
  • source code: now compiles cleanly under Win64

Changes in 1.91 beta (30 Jun 2004):

  • djgpp2/coff: added support for recent binutils versions
  • linux/elf386, linux/sh386: lots of improvements
  • vmlinuz/386: added support for recent kernels
  • watcom/le: don't crash on files without relocations
  • win32/pe: stricter checks of some PE values
  • option '--brute' now implies '--crp-ms=999999'.
  • source code: much improved portability using ACC, the Automatic Compiler Configuration
  • source code: compile fixes for strict ISO C++ compilers
  • source code: compile fixes for Win64
  • re-synced with upx 1.25 branch

Changes in 1.90 beta (11 Nov 2002):

  • implemented several new options for finer compression control: '--all-methods', '--all-filters' and '--brute'
  • ps1/exe: new format - UPX now supports PlayStation One programs
  • linux/386: added the option '--force-execve'
  • vmlinuz/386: better kernel detection and sanity checks
  • re-synced with upx 1.24 branch
  • documentation updates

Changes in 1.11 beta (20 Dec 2000):

  • vmlinuz/386: new format - UPX now supports bootable linux kernels
  • linux/elf386: added the new ELF direct-to-memory executable format - no more temp files are needed for decompression!
  • linux/sh386: added the new shell direct-to-memory executable format - no more temp files are needed for decompression!
  • reduced overall memory requirements during packing
  • quite a number of internal source code rearrangements

==================================================================

Changes in 1.25 (29 Jun 2004)

  • INFO: http://upx.sourceforge.net is the new UPX home page
  • watcom/le: don't crash on files without relocations
  • win32/pe: stricter checks of some PE values
  • source code: much improved portability using ACC, the Automatic Compiler Configuration
  • source code: compile fixes for strict ISO C++ compilers
  • source code: compile fixes for Win64

Changes in 1.24 (07 Nov 2002)

  • djgpp2/coff: stricter check of the COFF header to work around a problem with certain binutils versions

Changes in 1.23 (05 Sep 2002)

  • atari/tos: fixed an unpacking problem where a buffer was too small (introduced in 1.22)
  • linux/386: don't give up too early if a single block turns out to be incompressible
  • documentation: added some quick tips how to achieve the best compression ratio for the final release of your application
  • fixed a rare situation where the exit code was not set correctly

Changes in 1.22 (27 Jun 2002)

  • atari/tos: the stub now flushes the CPU cache to avoid problems on 68030+ machines
  • source code: additional compiler support for Borland C++, Digital Mars C++ and Watcom C++

Changes in 1.21 (01 Jun 2002)

  • New option '--crp-ms=' for slightly better compression at the cost of higher memory requirements during compression. Try 'upx --best --crp-ms=100000'. See the docs for more info.
  • source code: portability fixes
  • source code: compile fixes for g++ 3.0 and g++ 3.1

Changes in 1.20 (23 May 2001)

  • slightly faster compression
  • work around a gcc problem in the latest djgpp2 distribution
  • watcom/le: fixed detection of already compressed files
  • win32/pe: do not compress RT_MANIFEST resource types
  • win32/pe: improved the error message for empty resource sections
  • [NOTE: the jump from 1.08 to 1.20 is to avoid confusion with our unstable development releases 1.1x and 1.9x]

Changes in 1.08 (30 Apr 2001)

  • new native port to atari/tos
  • win32/pe: shortened the identstring
  • source code: portability fixes - UPX now builds cleanly under m68k CPUs

Changes in 1.07 (20 Feb 2001)

  • win32/pe: corrected the TLS callback check
  • win32/pe: really fixed that rare bug in relocation handling
  • win32/pe: experimental support for SizeOfHeaders > 0x1000
  • win32/pe: check for superfluous data between sections
  • win32/pe: compressing screensavers (.scr) should finally work

Changes in 1.06 (27 Jan 2001)

  • win32/pe: the check for TLS callbacks introduced in 1.05 was too strict - disabled for now
  • dos/com: decreased the decompressor stack size a little bit

Changes in 1.05 (24 Jan 2001)

  • win32/pe: refuse to compress programs with TLS callbacks
  • win32/pe: stub changes to avoid slowdowns with some virus monitors
  • win32/pe: reverted the relocation handling changes in 1.04
  • linux/386: dont try to compress Linux kernel images (have a look at the unstable UPX 1.1x beta versions for that)

Changes in 1.04 (19 Dec 2000)

  • dos/exe: fixed an internal error when using '--no-reloc'
  • win32/pe: fixed a rare bug in the relocation handling code
  • some tunings for the default compression level

Changes in 1.03 (30 Nov 2000)

  • linked with a new version of the NRV compression library:
    • improved compression ratio a little bit
    • overall significantly faster compression
    • much faster when using high compression levels like '-9' or '--best'
    • much faster with large files
  • atari/tos: added support for FreeMiNT
  • the 32-bit DOS version now uses the new CWSDSTUB extender

Changes in 1.02 (13 Sep 2000)

  • watcom/le: fixed a problem with the Causeway extender
  • win32/pe: don't automatically strip relocs if they seem needed
  • support multiple backup generations when using '-k'
  • updated the console screen driver

Changes in 1.01 (09 Apr 2000)

  • win32/pe: fixed an uncompression problem in DLLs with empty fixup sections
  • win32/pe: fixed another rare uncompression problem - a field in the PE header was set incorrectly

Changes in 1.00 (26 Mar 2000)

  • documentation updates
  • watcom/le: do not duplicate the non-resident name table
  • win32/pe: fixed an import handling problem: sometimes too much data could be deleted from a file -> the uncompressed file would not work anymore

Changes in 0.99.3 (07 Mar 2000)

  • win32/pe: fixed a rare problem in the stub string handling part

Changes in 0.99.2 (02 Mar 2000)

  • dos/exe: fixed a typo causing an internal error (introduced in 0.99.1)

Changes in 0.99.1 (29 Feb 2000)

  • win32/pe: fixed some object alignments which were causing problems when loading compressed DLLs under Windows NT/2000

Changes in 0.99 (25 Feb 2000)

  • FULL SOURCE CODE RELEASED UNDER THE TERMS OF THE GNU GPL
  • win32/pe: changed default to '--strip-relocs=1'
  • dos/com and dos/sys: fixed a bad decompressor problem
  • linux/386: the counter for the progress indicator was off by one

==================================================================

Changes in 0.94 (06 Dec 1999)

  • win32/pe: the stub now calls ExitProcess in case of import errors
  • under DOS and Windows, the environment variable UPX now accepts a '#' as replacement for '=' because of a COMMAND.COM limitation

Changes in 0.93 (22 Nov 1999)

  • win32/pe: fixed --strip-relocs problem with uncompression
  • win32/pe: fixed a bug which could produce a broken decompressor stub
  • linux/386: yet another FreeBSD compatibility fix

Changes in 0.92 (14 Nov 1999)

  • win32/pe: really fixed that one line (see below)

Changes in 0.91 (13 Nov 1999)

  • win32/pe: an important one-line fix for the newly introduced problems
  • dos/com and dos/sys: fixed an internal error
  • dos/exe: correctly restore cs when uncompressing

Changes in 0.90 (10 Nov 1999)

  • all formats: '--overlay=copy' now is the default overlay mode
  • improved compression ratio for most files
  • win32/pe: uncompression is finally supported
  • win32/pe: never compress REGISTRY resources
  • win32/pe: headersize was not set in PE header
  • win32/pe: resource handling is rewritten
  • win32/pe: the last :-) TLS problem is fixed
  • win32/pe: somewhat less memory is required during compression
  • linux/386: fixed compression of scripts which was broken since 0.71
  • linux/386: more FreeBSD compatibility issues
  • changed option: '-i' now prints some more details during compression (not finished yet)

Changes in 0.84 (04 Oct 1999)

  • dos/exe: fixed a rare problem where the decompressor could crash
  • some other minor fixes

Changes in 0.83 (17 Sep 1999)

  • dos/exe: fixed minimal memory requirement problem for some files
  • win32/pe: fixed a bug which caused a crash in some compressed files
  • linux/386: various improvements in the stub; also, for the sake of FreeBSD users, the stub is now branded as Linux/ELF

Changes in 0.82 (16 Aug 1999)

  • dos/exe: fixed a decompressor bug which could cause crash on some files
  • linux/386: section headers are now stripped from the stub so that 'strip' won't ruin a compressed file any longer
  • wc/le: support for stack not in the last object disabled again
  • win32/pe: removed some unneeded data

Changes in 0.81 (04 Aug 1999)

  • win32/pe: fixed an important bug in import handling
  • dos/com: fixed an internal error that could happen with very small files

Changes in 0.80 (03 Aug 1999)

  • you can set some default options in the environment var 'UPX'
  • dos/com: the decompressor stub now checks for enough free memory
  • dos/exe: decompressor rewritten, some bugs are fixed
  • dos/exe: new option '--no-reloc': no relocation data is put into the DOS header
  • tmt/adam: added support for more stubs, detect already packed files
  • tmt/adam: new option '--copy-overlay'
  • wc/le: reduced memory requirement during uncompression
  • wc/le: support files which do not contain their stack in the last object
  • wc/le: fixed a bug which could cause a crash, improved relocation handling
  • wc/le: new option '--copy-overlay'
  • win32/pe: '--compress-icons=2' is now the default
  • win32/pe: even better TLS support
  • win32/pe: versioninfo works on NT
  • win32/pe: import by ordinal from kernel32.dll works
  • win32/pe: other import improvements: importing a nonexistent DLL results in a usual Windows message, importing a nonexistent function results in program exit (instead of crash ;-)
  • win32/pe: new option: '--compress-resources=0'
  • win32/pe: reduced memory requirement during uncompression, some files might even require LESS memory when they're compressed
  • win32/pe: TYPELIBs should work now
  • win32/pe: improved relocation handling, 16-bit relocations should work
  • win32/pe: new option '--strip-relocs' (only if you know what you are doing)
  • win32/pe: new option '--copy-overlay'
  • important internal changes: now the stubs are built at runtime

Changes in 0.72 (12 May 1999)

  • tmt/adam: fixed a serious problem in the decompressor stub; all compressed tmt files should be recompressed
  • win32/pe: fixed the 'shared sections not supported' warning: read-only shared sections are fine
  • win32/pe: never compress TYPELIB resources
  • win32/pe: compressed files are hopefully less suspicious to heuristic virus scanners now
  • linux/386: minor decompressor stub updates, nicer progress bar

Changes in 0.71 (19 Apr 1999)

  • dos/exe: added option '--no-overlay'
  • linux/386: various improvements in the stub, most notably the overhead for an extra cleanup process has been removed
  • win32/pe: added support for export forwarders
  • win32/pe: added support for DLLs without entry point or imports
  • win32/pe: yet another .bss fix
  • win32/pe: new option '--compress-icons=2': compress all icons which are not in the first icon directory
  • win32/pe: rearranged stub to avoid false alerts from some virus scanners

Changes in 0.70 (30 Mar 1999)

  • added support for linux/386 executables
  • improved compression ratio quite a bit
  • added new compression level '--best' to squeeze out even some more bytes
  • win32/pe: TLS support is much better now
  • win32/pe: --compress-icons=0 should now work as well
  • the usual minor fixes for win32/pe

Changes in 0.62 (16 Mar 1999)

  • win32/pe: --compress-icons and --compress-exports are on now by default
  • win32/pe: --compress-icons should really work now
  • win32/pe: fixed a problem with embedded .bss sections

Changes in 0.61 (08 Mar 1999)

  • atari/tos: fixed a problem where the bss segment could become too small

Changes in 0.60 (06 Mar 1999)

  • win32/pe: fixed file corruption when the size of the export data is invalid
  • win32/pe: fixed a problem with empty resource data
  • win32/pe: compressed file alignment set to minimum value
  • win32/pe: made all compressed sections writable
  • fixed some other win32/pe bugs
  • fixed an address optimization problem for some not Watcom LE files
  • fixed a bug which could make UPX hang when an exe header contained an illegal value
  • added some compression flags for the win32/pe format
  • added support for Atari ST/TT executables (atari/tos)
  • improved compression ratio
  • improved compression speed

Changes in 0.51 (14 Jan 1999)

  • fixed a small bug in the PE header that would prevent some compressed win32/pe executables from running under Windows NT and WINE

Changes in 0.50 (03 Jan 1999)

  • added support for PE format executables (win32/pe & rtm32/pe)
  • added support for TMT executables (tmt/adam)
  • fixed a dos/sys bug that affected OpenDOS

Changes in 0.40 (05 Oct 1998)

  • improved compression ratio
  • fixed a small but fatal bug in dos/sys introduced in 0.30
  • fixed a rare bug in dos/exe
  • worked around a bug in djgpp's strip 2.8
  • djgpp/coff: Allegro packfile support should work now
  • added dos/exeh compression method (works on 386+)

Changes in 0.30 (27 Jul 1998)

  • fixed a serious bug in the 32-bit compressors - please don't use djgpp/coff and watcom/le compressed files from previous versions, some of them are possibly damaged !
  • the 16-bit uncompressors are a little bit shorter & faster
  • fixed progress indicator for VESA and SVGA text modes

Changes in 0.20 (05 Jul 1998)

  • second public beta release
  • too many changes to list here

Changes in 0.05 (26 May 1998)

  • first public beta release