~/talk

I'm not a number, I'm a free file descriptor!!1

on YouTube 11m
Talkat !!Con 2016 · on Monday, 2016-05-30· [security]

speaker

name:Andreas Fuchs
links:none on file

resources

video:https://youtu.be/_XgXCVULj0o
slides:none on file

summary

Shows how Unix domain sockets carry open descriptors (use socketpair) to bypass per-process fd limits (Linux default ~1,000, OS 10 ~7,000) and how recursive passing creates 200,000 open files on Linux before the kernel chokes. Demonstrates a tiny test program that succeeds on Linux but fails on OS 10 because BSD closes trapped sockets, and reveals Linux’s unexpected mark-and-sweep garbage collector that traverses socket-contained fds about four–five levels deep.

AI-written summary · about

chapters (4)

  1. 0:00Start
  2. 1:32File Descriptors
  3. 3:42UNIX Domain Sockets
  4. 9:49Lesson learned

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