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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 18 Dec 2017
      Replying to @landley @pikhq @stephenrkell

      At best that lets you safely abort the program on excess input; there's still no way to cleanly recover.

      1 reply 0 retweets 0 likes
    2. @landley‏ @landley 18 Dec 2017
      Replying to @RichFelker @pikhq @stephenrkell

      I'm not saying it's a good idea, but http://pubs.opengroup.org/onlinepubs/009695399/functions/siglongjmp.html … is posix. (Black belt in disgusting solutions to impossible problems.)

      1 reply 0 retweets 1 like
    3. Rich Felker‏ @RichFelker 18 Dec 2017
      Replying to @landley @pikhq @stephenrkell

      longjmp is not AS-safe, so it can be used in a signal handler iff the signal does not interrupt any AS-unsafe functions. All of stdio is AS-unsafe.

      1 reply 0 retweets 0 likes
    4. @landley‏ @landley 18 Dec 2017
      Replying to @RichFelker @pikhq @stephenrkell

      You keep thinking threading is a mandatory part of C.

      1 reply 0 retweets 0 likes
    5.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 18 Dec 2017
      Replying to @landley @RichFelker and

      AS-safety has no relation to threads. (That said @RichFelker is slightly incorrect here: longjmp is AS-Safe but longjmping out of gets would not be http://pubs.opengroup.org/onlinepubs/9699919799/functions/longjmp.html … )

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 18 Dec 2017
      Replying to @erincandescent @landley and

      Ah, that's very strange text. It's almost the same as being non-AS-safe, but allows longjmp as long as rest of program only calls AS-safe functions until _exit or exec.

      1 reply 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 18 Dec 2017
      Replying to @RichFelker @erincandescent and

      And indeed it has nothing to do with threads. It just means the internal state of stdio (or anything not AS-safe) will be inconsistent after longjmp out of it from a signal handler.

      1 reply 0 retweets 0 likes
    8. Stephen Kell‏ @stephenrkell 19 Dec 2017
      Replying to @RichFelker @erincandescent and

      I don't understand the argument here. If we're providing a safe gets(), we're necessarily free to write down our own refinement of POSIX (which we're implementing). That can include more permissive AS-safety rules. Clients targeting the general POSIX gets() were already hosed.

      1 reply 0 retweets 0 likes
    9. @landley‏ @landley 19 Dec 2017
      Replying to @stephenrkell @RichFelker and

      Nah, my point was you can aftermarket set up a choke collar for gets. I didn't say it was a good idea, just not impossible. :)

      1 reply 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 19 Dec 2017
      Replying to @landley @stephenrkell and

      Exactly. @landley was talking about mitigation of gets() badness on the application side, not the implementation side.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 19 Dec 2017
      Replying to @RichFelker @landley and

      On the implementation side, the only mitigation is to have a memory-safe C implementation (highly nontrivial) so that it necessarily traps when gets() overflows.

      8:02 AM - 19 Dec 2017
      1 reply 0 retweets 0 likes
        1. Stephen Kell‏ @stephenrkell 19 Dec 2017
          Replying to @RichFelker @landley and

          Ah yes, all agreed. A memory-safe C implementation is what I'm working on. :-) (It promises to suck less than the others, too.)https://github.com/stephenrkell/libcrunch …

          0 replies 0 retweets 1 like
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