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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

Tweets

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    1. Tavis Ormandy‏Verified account @taviso May 25
      • Report Tweet
      • Report NetzDG Violation
      Replying to @RichFelker @dEnergy_dTime and

      Yes, after you've installed them and then used adb, at which point why can't you use your own binaries?

      1 reply 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker May 25
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @dEnergy_dTime and

      No, before you install. Ever heard of third party Play Store clients?

      1 reply 0 retweets 1 like
    3. Rich Felker‏ @RichFelker May 25
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      Replying to @RichFelker @taviso and

      But if there weren't a workflow to do this it wouldn't mean repro builds are useless. It would be a flaw in the store's app delivery model that needs fixing.

      1 reply 0 retweets 0 likes
    4. Tavis Ormandy‏Verified account @taviso May 25
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      Replying to @RichFelker @dEnergy_dTime and

      I see, so the threat model that means everyone should be using repro builds is: An android user that is willing to violate the terms of usage, can build their own application, but can't sideload so they can use the build they trust, for some reason? Correct?

      2 replies 0 retweets 0 likes
    5. Marcus Müller‏ @dEnergy_dTime May 25
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      Replying to @taviso @RichFelker and

      no, a security expert that gets the source code of an application to verify his organization should, in fact, use e.g. that e2e crypto messenger, does a build, build matches what's on app store, expert says "is OK", admins/users deploy/install now officially trusted software.

      1 reply 0 retweets 3 likes
    6. Marcus Müller‏ @dEnergy_dTime May 25
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      Replying to @dEnergy_dTime @taviso and

      honestly, I'm a bit confused why you still think the end user would need to build the software. If you know what the binary should look like, you can delegate trust.

      1 reply 0 retweets 2 likes
    7. Tavis Ormandy‏Verified account @taviso May 25
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      Replying to @dEnergy_dTime @RichFelker and

      Someone you trust needs to build the software. I'm saying, why not get the binaries from them - that system works today, it's how Linux distributions work.

      3 replies 0 retweets 1 like
    8. Marcus Müller‏ @dEnergy_dTime May 25
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      Replying to @taviso @RichFelker and

      say I read through the signal app source code and build infra. It's sound. How can I tell the world that the app they are currently pulling from Google's app store is source-audited? Applies the same to Linux distros.

      1 reply 0 retweets 1 like
    9. Tavis Ormandy‏Verified account @taviso May 25
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      • Report NetzDG Violation
      Replying to @dEnergy_dTime @RichFelker and

      You can say "The source code and build infrastructure is safe"?

      1 reply 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker May 25
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      Replying to @taviso @dEnergy_dTime and

      Are we back to bugdoors and all-or-nothing absolutism? *sigh*

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso May 25
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      Replying to @RichFelker @dEnergy_dTime and

      What are you talking about? You've invented this fantasy threat model where the user can't build software, but it is open source, and you do trust the vendor but not their build software, and then when I point out it doesn't match reality you call it "absolutism"?

      12:36 PM - 25 May 2020
      0 replies 0 retweets 0 likes

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