Can your diff(1) do this?! Can your diff(1) do this?! Improving - - PowerPoint PPT Presentation

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Can your diff(1) do this?! Can your diff(1) do this?! Improving - - PowerPoint PPT Presentation

Jan 11, 2023 190 likes •866 views

Can your diff(1) do this?! Can your diff(1) do this?! Improving soware review & QA with diffoscope Improving soware review & QA with diffoscope Chris Lamb Chris Lamb foss-north.se foss-north.se @lolamby @lolamby April 2018

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Can your diff(1) do this?! Can your diff(1) do this?!

Improving soware review & QA with diffoscope Improving soware review & QA with diffoscope Chris Lamb Chris Lamb @lolamby @lolamby Debian Project Leader Debian Project Leader foss-north.se foss-north.se April 2018 April 2018 Gothenburg, Sweden Gothenburg, Sweden

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Hallå! Hallå!

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Open source developer for 10+ years Debian Project Leader

  • pensource.org board member

Freelance soware developer

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Why? Why?

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Source code available for free soware… … everyone runs binaries Do they correspond?

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Build farms Developer's machines Blackmail, law-enforcement…

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  • 1. Ensure build have identical results
  • 2. Multiple parties compare results
  • 3. Attacker must infect everybody simultaneously
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Identical results? Identical results?

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Archive formats Archive formats

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Compressed formats Compressed formats

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Recursive Recursive

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Line ordering Line ordering

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HTML output HTML output

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Android boot ROMs, Android APKs, ar archives, bzip2 files, Coreboot cbfs, CPIO archives, Dalvik dex file, Debian packages, device (mknod), device tree globs, directories, docx, ELF binaries, ext filesystem images, fontconfig cache dirs, fonts, gettext catalogues, GIF images, Git repositories, GZip files, Haskell binaries, ICC colour profiles, ISO images, Java, bytecode, Javascript, JSON, LLVM binaries, Macho binaries, Mono executables, odt documentens, Ogg borbis, OpenSSH keys, Pascal binaries, PDF files, PGP/GPG keys, PNG images, PostScript, RPM images, R statistical data, Rust binaries, SQLite databases, squashfs images, symlinks, tar archives, tcpdump dumps, text files, XML documents, XZ files, ZIP archives …

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Android images Android images

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Berkeley DB databases Berkeley DB databases

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Microso Word Microso Word .docx .docx

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Ebooks Ebooks

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Mono binaries Mono binaries

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git(1) git(1) repositories

repositories

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Gnumeric spreadsheets Gnumeric spreadsheets

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ISO images ISO images

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JSON JSON

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OpenDocument text documents OpenDocument text documents

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Ogg audio files Ogg audio files

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tcpdump(1) tcpdump(1) capture files

capture files

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PDF PDF

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XML documents XML documents

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Using diffoscope for QA Using diffoscope for QA

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Just see changes you expect Just see changes you expect

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Seeing "no" changes Seeing "no" changes

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Security releases Security releases

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Security "releases" Security "releases"

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Getting started Getting started

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try.diffoscope.org try.diffoscope.org

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Current status Current status

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Parallel processing Parallel processing

Multiple previous attempts… … Juliana Oliveira working on this now

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diffoscope.org diffoscope.org

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Tack! Tack!

@lolamby @lolamby lamby@debian.org lamby@debian.org diffoscope.org diffoscope.org chris-lamb.co.uk chris-lamb.co.uk

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@lolamby @lolamby lamby@debian.org lamby@debian.org diffoscope.org diffoscope.org chris-lamb.co.uk chris-lamb.co.uk