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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker May 27

      Interesting new class of bugs I need to write about and report: select requires pointers to objects of type fd_set, but some programs including OpenSSH pass it a pointer to malloc'd memory sized only for nfds, not sizeof(fd_set).

      3 replies 2 retweets 10 likes
      Show this thread
    2. Robert Ou‏ @rqou_ May 27
      Replying to @RichFelker

      Does this not work? I thought this was the workaround used if your fd number was higher than would fit in a fd_set?

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker May 27
      Replying to @rqou_

      That's not valid usage; the args must be null or point to objects of type fd_set. A hardened implementation will trap on nfds>FD_SETSIZE since it's UB.

      9:53 AM - 27 May 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker May 27
          Replying to @RichFelker @rqou_

          If you really want to *try* using higher numbers and hope it works, you really need to allocate an array of fd_set objects (rounded up to whole objects) rather than partial ones, and apply the FD_*() macros to the right element of the array. But there's no guarantee it'll work.

          1 reply 0 retweets 0 likes
        3. Robert Ou‏ @rqou_ May 27
          Replying to @RichFelker

          What layer of the stack defines this as UB? A while back a friend and I looked at this and confirmed that most "traditional Unix-like or inspired" (Linux, macOS, and some BSDs) just use bitfields of various shapes for fd_set and work just fine with larger/smaller ones.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker May 27
          Replying to @rqou_

          Violation of a "shall" in the description of select's interface contract.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker May 27
          Replying to @RichFelker @rqou_

          Note that there's no specification of the layout/order of bits in the fd_set so the low bits could be at the end of it.

          1 reply 0 retweets 0 likes
        6. Robert Ou‏ @rqou_ May 27
          Replying to @RichFelker

          I know this part. We were making syscalls directly and had slightly different codepaths for all the platforms we supported.

          1 reply 0 retweets 0 likes
        7. Justin Cormack‏ @justincormack May 27
          Replying to @rqou_ @RichFelker

          The syscall APIs are not the same as the Posix APIs.

          0 replies 0 retweets 1 like
        8. End of conversation

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