UPX(the Ultimate Packer for eXecutables)是一个非常全面的可执行文件压缩软件,支持dos/exe、dos/com、dos/sys、djgpp2/coff、 watcom/le、win32/pe、rtm32/pe、tmt/adam、atari/tos、linux/i386等几乎所有平台上的可执行文件, 具有极佳的压缩比,还可以对未压缩的文件和压缩完后进行比较。

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 suport ELF on QNX 6.3.0 for armel (experimental).
* Better diangostic 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