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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. Matthew Garrett‏ @mjg59 Mar 30
      Replying to @alicegoldfuss

      If it's a constant argument I think there's no real security difference but definitely no harm in it

      1 reply 0 retweets 2 likes
    2. malice ghoulpus‏ @alicegoldfuss Mar 30
      Replying to @mjg59

      yeah it says we'll get into the Why later on but for now to do it as practice

      1 reply 0 retweets 0 likes
    3. Matthew Garrett‏ @mjg59 Mar 30
      Replying to @alicegoldfuss

      I guess if it's a dynamically generated string and you use puts you don't have to worry about format character attacks but hmm it's a moderately contrived case

      1 reply 0 retweets 2 likes
    4. Matthew Garrett‏ @mjg59 Mar 30
      Replying to @mjg59 @alicegoldfuss

      Don't want to criticise in any way, there's definitely nothing wrong with using puts() in this case

      1 reply 0 retweets 2 likes
    5. malice ghoulpus‏ @alicegoldfuss Mar 30
      Replying to @mjg59

      I welcome helpful critique! All I have is this book and what I can find online. Hearing best practices from Real Life C Programmers is what I need.

      1 reply 0 retweets 2 likes
    6. Matthew Garrett‏ @mjg59 Mar 30
      Replying to @alicegoldfuss

      I can't think of a case I've seen in recent history that didn't just use printf for fixed strings - I think puts() probably has a bad rap because it's the counterpart to gets() and that's terrible

      4 replies 1 retweet 5 likes
    7. Joe Beda‏Verified account @jbeda Mar 30
      Replying to @mjg59 @alicegoldfuss

      One thing you can do is use printf to justify strings so you don't have to count spaces. "%10s" IIRC. "%-10s" to right justify.

      1 reply 0 retweets 3 likes
    8. malice ghoulpus‏ @alicegoldfuss Mar 31
      Replying to @jbeda @mjg59

      I did that! :) also why is gets() terrible? I haven't used it yet

      2 replies 0 retweets 0 likes
    9. Matthew Garrett‏ @mjg59 Mar 31
      Replying to @alicegoldfuss @jbeda

      It'll read until it sees a carriage return, and then write that into a buffer. There's no way to tell it how big the destination buffer is, so it'll happily write over the end of the buffer and either crash or allow an attacker to influence the behaviour of your code

      3 replies 0 retweets 21 likes
    10. malice ghoulpus‏ @alicegoldfuss Mar 31
      Replying to @mjg59 @jbeda

      why...does it still exist? and what should I use instead? getchar()? scanf()?

      8 replies 0 retweets 7 likes
      Rich Felker‏ @RichFelker Apr 1
      Replying to @alicegoldfuss @mjg59 @jbeda

      Use fgets if you want to impose a length limit anyway to avoid runaway resource usage on bad/malicious input. Use getline (POSIX, not plain C, though) if you want easy automatic allocation for arbitrary-length lines.

      12:17 PM - 1 Apr 2018
      • 2 Likes
      • yeskinger malice ghoulpus
      0 replies 0 retweets 2 likes

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