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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. Brig Young‏ @Sonophoto 1 May 2017
      Replying to @blakkheim

      Nice, an operating system that kills desktop X apps when they exceed 500MB and no mention in the install docs. #OpenBSD

      3 replies 0 retweets 0 likes
    2. Anthony J. Bentley‏ @AnthonyJBentley 2 May 2017
      Replying to @Sonophoto @blakkheim

      #OpenBSD doesn’t kill anything. Low ulimit just means the allocation fails. It’s Firefox that then tries to use invalid memory, and crashes.

      2 replies 0 retweets 2 likes
    3. Anthony J. Bentley‏ @AnthonyJBentley 2 May 2017
      Replying to @AnthonyJBentley @Sonophoto @blakkheim

      Same problem shows up on Linux if you turn off memory overcommit. https://www.etalabs.net/overcommit.html  (h/t @RichFelker)

      3 replies 0 retweets 2 likes
    4. Anthony J. Bentley‏ @AnthonyJBentley 2 May 2017
      Replying to @AnthonyJBentley @Sonophoto and

      There are two unforgivable users of malloc: programs that don’t check the return value, and libraries that kill the program if returns NULL.

      3 replies 3 retweets 3 likes
    5. Arvid Gerstmann‏ @ArvidGerstmann 3 May 2017
      Replying to @AnthonyJBentley @Sonophoto and

      virtual memory be available?

      2 replies 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 3 May 2017
      Replying to @ArvidGerstmann @AnthonyJBentley and

      No. I assume by virt mem you actually mean swap, which is a horrible idea bc it just changes failure mode to bogging down swapping for weeks

      2 replies 0 retweets 1 like
    7. Arvid Gerstmann‏ @ArvidGerstmann 3 May 2017
      Replying to @RichFelker @AnthonyJBentley and

      Yes, I meant swap. malloc is returning NULL if swapped? I forgot about limited 32bit addr. space. That's a likely case.

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 3 May 2017
      Replying to @ArvidGerstmann @AnthonyJBentley and

      No, I just mean having (nontrivial amounts of) swap is a very bad idea. Instead of malloc failing & being able to report failure...

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 3 May 2017
      Replying to @RichFelker @ArvidGerstmann and

      ...you can get the system into a state where it would take weeks to successfully login & kill whatever allocated so much.

      4:00 AM - 3 May 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Arvid Gerstmann‏ @ArvidGerstmann 3 May 2017
          Replying to @RichFelker @AnthonyJBentley and

          Yes, I've been in such situations. They aren't cool. What's suggested on Linux to do on malloc failure? In games it's easy, you often have a

          2 replies 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 3 May 2017
          Replying to @ArvidGerstmann @AnthonyJBentley and

          Library level - back out the operation and return an error (you did remember not to commit/free anything before finishing alloc, right?).

          1 reply 0 retweets 1 like
        4. Rich Felker‏ @RichFelker 3 May 2017
          Replying to @RichFelker @ArvidGerstmann and

          Application level - depends on the app. Those with no valuable data of any sort can just try to show an error and exit...

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 3 May 2017
          Replying to @RichFelker @ArvidGerstmann and

          But if you have any data the user might be upset to lose, you need at least an allocation-free emergency-save/recovery-dump code path.

          1 reply 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker 3 May 2017
          Replying to @RichFelker @ArvidGerstmann and

          Or you need to ensure that data is constantly saved in a form suitable for recovery after abort (see browsers' tab-restore features).

          0 replies 0 retweets 0 likes
        7. End of conversation
        1. New conversation
        2. Brendan G Bohannon‏ @cr88192 3 May 2017
          Replying to @RichFelker @ArvidGerstmann and

          have wished before that Win64 could autokill / fail-to-alloc to processes which try to allocate excessive amounts of memory...

          1 reply 0 retweets 0 likes
        3. Brig Young‏ @Sonophoto 3 May 2017
          Replying to @cr88192 @RichFelker and

          #openBSD /etc/login.conf configures that type of behaviour.

          1 reply 0 retweets 0 likes
        4. Brendan G Bohannon‏ @cr88192 4 May 2017
          Replying to @Sonophoto @RichFelker and

          yeah, but an issue is 64-bit apps in Windows 10; end up sometimes needing to use a specialized malloc to fail or die past a certain limit.

          1 reply 0 retweets 0 likes
        5. Brig Young‏ @Sonophoto 5 May 2017
          Replying to @cr88192 @RichFelker and

          I use windows a fair bit but I don't program it or know its oddities.

          1 reply 0 retweets 0 likes
        6. Brendan G Bohannon‏ @cr88192 5 May 2017
          Replying to @Sonophoto @RichFelker and

          main issue is, a 64-bit program with a bad leak may quickly eat GBs of RAM, leading to thrashing, and possibly a BSOD.

          0 replies 0 retweets 0 likes
        7. End of conversation

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