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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Anthony Ramine‏ @nokusu 14 Sep 2019
      • Report Tweet
      • Report NetzDG Violation

      Anthony Ramine Retweeted Patrick Walton

      Yet another reason we should bit the bullet at some point and switch our IPC story to proper XPC services with multiple executables on macOS: this wouldn't be a problem if we were using XPC objects.https://twitter.com/pcwalton/status/1172741450271903744 …

      Anthony Ramine added,

      Patrick Walton @pcwalton
      So to elaborate: On at least some versions of macOS, if you use the POSIX sendmsg(2) API to send a file descriptor over a Unix domain socket, and you close the fd before the other side has received the message, the fd inside the message will become useless. Very annoying bug.
      Show this thread
      2 replies 0 retweets 2 likes
      Show this thread
    2. Patrick Walton‏ @pcwalton 14 Sep 2019
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      Replying to @nokusu

      To be honest I think we should probably write a wrapper around Chromium’s Mojo and just let outsource all our IPC to Google. They even wrote Rust bindings :)

      1 reply 0 retweets 0 likes
    3. Anthony Ramine‏ @nokusu 14 Sep 2019
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      Replying to @pcwalton

      AFAIK, Mojo doesn't use XPC on macOS, so I have trouble believing it works without making shared IOSurface values global.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 14 Sep 2019
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      Replying to @nokusu

      I don’t think we need to transfer IOSurfaces between processes anymore?

      9:11 AM - 14 Sep 2019
      • 1 Like
      • Anthony Ramine
      1 reply 0 retweets 1 like
        1. New conversation
        2. Anthony Ramine‏ @nokusu 14 Sep 2019
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          Replying to @pcwalton

          Oh, well if that's correct that certainly makes using XPC less important.

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton 14 Sep 2019
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          Replying to @nokusu

          For security we don’t want the content process to be able to access GPU memory at all, including IOSurfaces. Too much driver attack surface.

          0 replies 1 retweet 1 like
        4. End of conversation

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