Commits on Jun 19, 2020

1. Improve the default section alignment choice …

   Currently patchelf uses the host system's page size (determined at build
   time) as the default section load memory alignment. This causes multiple
   issues
   
   - Cross-compilation: when using patchelf on ELFs targetting a different
     architecture from the host, the host page size is still used by
     default.
   
   - Variable page size architectures: ARMv8 systems can be configured in
     either 4K, 16K, or 64K page size mode depending on kernel
     configuration. An ARMv8 patchelf built on a 4K page size system will
     end up creating ELFs that cannot be used on a 64K page size system.
   
   - Reproducibility: the page size of the machine that built patchelf
     "leaks" into the binary.
   
   The build time --with-page-size as well as the run time --page-size
   options can be used to work around some of these issues. But it's much
   better to have patchelf do the right thing without explicit
   configuration.
   
   This commit adds support for inferring page size from the ELF header's
   "machine" field. The default values are extracted from GNU gold's source
   code. Note that both --with-page-size as well as --page-size continue to
   work and take precedence on the default value.

   

   delroth committed Jun 19, 2020
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   0470d69 View commit details

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