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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. Patrick Walton‏ @pcwalton 13 Sep 2019
      • Report Tweet
      • Report NetzDG Violation

      macOS and Windows both essentially have the concept of a “weak file descriptor” (in the former case due to a kernel bug): file descriptors that you must hold open in the creator process when you transfer them or they get corrupted somehow. These are the most evil things.

      4 replies 9 retweets 62 likes
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      Patrick Walton‏ @pcwalton 13 Sep 2019
      • Report Tweet
      • Report NetzDG Violation

      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.

      10:18 PM - 13 Sep 2019
      • 2 Retweets
      • 10 Likes
      • Joachim Schipper Michał K. Feiler ❁ Chad Austin Christian Schwarz Rhaladriel Satoshi Nakadashi Farseen Abdul Salam Wes jameschurchman
      3 replies 2 retweets 10 likes
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        2. Patrick Walton‏ @pcwalton 13 Sep 2019
          • Report Tweet
          • Report NetzDG Violation

          On Windows, you can effectively get a handle to some graphics memory by creating a D3D11 texture with the SHARED flag. This gives you a HANDLE (basically an fd) that you can use to open that memory for read/write in another process. Nice, except…

          1 reply 1 retweet 4 likes
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        3. Patrick Walton‏ @pcwalton 13 Sep 2019
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          • Report NetzDG Violation

          …if you destroy the texture before another process has opened it, then the HANDLE becomes invalid. Same problem! Microsoft fixed this, sort of, by introducing a new flag in D3D 11.1, SHARED_NTHANDLE, with sensible semantics. But only on D3D 11.1.pic.twitter.com/6bVEZMbcc7

          0 replies 1 retweet 6 likes
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        1. Advertisement will resume after this video‏ @kwaktrap 14 Sep 2019
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          Replying to @pcwalton @xlerb

          That's an improvement, I remember the same behaviour panicking the osx kernel 10-15Y ago

          0 replies 0 retweets 1 like
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        1. Marc Espie‏ @espie_openbsd 14 Sep 2019
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          Replying to @pcwalton

          fd passing is a large can of worms. Who owns the fd in transit ? Nobody ? then you can get over ulimit by stashing fds. The receiver ? someone can DoS you by sending fds. over ulimit -> boom you can no longer open new files. You saw the problem with sender-as-owner...

          0 replies 0 retweets 0 likes
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