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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. John Regehr‏ @johnregehr 7 Mar 2016

      another slightly alarming C program from the Cerberus folkspic.twitter.com/1FfEaN8yP3

      10 replies 89 retweets 94 likes
    2. Alexander Cherepanov‏ @ch3root 7 Mar 2016
      Replying to @johnregehr

      @johnregehr I thought you were a fan of this one. You know, defensive programming and such...

      1 reply 0 retweets 0 likes
    3. Alexander Cherepanov‏ @ch3root 7 Mar 2016
      Replying to @ch3root

      @johnregehr Hm, but maybe it's possible to decouple the question of assignments of struct with diff tags and their aliasing though...

      1 reply 0 retweets 0 likes
    4. John Regehr‏ @johnregehr 7 Mar 2016
      Replying to @ch3root

      @ch3root I do like strong typing...

      1 reply 0 retweets 0 likes
    5. Alexander Cherepanov‏ @ch3root 7 Mar 2016
      Replying to @johnregehr

      @johnregehr If we say that structs with diff tags are strongly diff types than it's quite natural for them not to alias?

      1 reply 0 retweets 0 likes
    6. friend void‏ @volatile_void 7 Mar 2016
      Replying to @ch3root

      @ch3root The same applies equally with “ *&(s1p->i1) = 2; ” instead, and with “ int *tmp = &(s1p->i1); *tmp = 2; ”.

      1 reply 1 retweet 0 likes
    7. friend void‏ @volatile_void 7 Mar 2016
      Replying to @volatile_void

      @ch3root A sanitizer that warned the above program is doing sth wrong would have to annotate every pointer with provenance.

      2 replies 0 retweets 0 likes
    8. Alexander Cherepanov‏ @ch3root 7 Mar 2016
      Replying to @volatile_void

      @spun_off Not sure what you mean exactly. *s1p implied by s1p-> requires that the memory has the type s1. It doesn't matter what you do next

      1 reply 0 retweets 0 likes
    9. friend void‏ @volatile_void 7 Mar 2016
      Replying to @ch3root

      @ch3root I don't know what rules the compiler uses. One line of reasoning is that *<some int*> reads/writes a value of effective type int.

      2 replies 0 retweets 0 likes
    10. friend void‏ @volatile_void 7 Mar 2016
      Replying to @volatile_void

      @ch3root Examples show that this is not how they approach it. The rules they actually use are not documented anywhere.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 7 Mar 2016
      Replying to @volatile_void

      @spun_off @ch3root My leaning is that struct type is only relevant to aliasing if you store/load whole struct, not members.

      9:55 AM - 7 Mar 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 7 Mar 2016
          Replying to @RichFelker

          @RichFelker @spun_off Do you agree that this is not what is written in the standard?

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 7 Mar 2016
          Replying to @ch3root

          @ch3root @spun_off The language in the standard is not sufficiently clear to say.

          1 reply 0 retweets 0 likes
        4. Alexander Cherepanov‏ @ch3root 7 Mar 2016
          Replying to @RichFelker

          @RichFelker @spun_off My reading goes like this. Consider struct s { int i; } x; The effective type of these 4 bytes is either struct s or\

          1 reply 0 retweets 0 likes
        5. Alexander Cherepanov‏ @ch3root 7 Mar 2016
          Replying to @ch3root

          @RichFelker @spun_off int, right? I can be accesses both as x and as x.i, i.e. with types struct s and int.

          1 reply 0 retweets 0 likes
        6. Alexander Cherepanov‏ @ch3root 7 Mar 2016
          Replying to @ch3root

          @RichFelker @spun_off C11, 6.5p7, is not symmetric. The item before the last says that accessing int with struct s is ok. But there is\

          1 reply 0 retweets 0 likes
        7. Alexander Cherepanov‏ @ch3root 7 Mar 2016
          Replying to @ch3root

          @RichFelker @spun_off no text in the standard that permits to access struct s as int. Hence the only possible reading is that the effective\

          1 reply 0 retweets 0 likes
        8. Alexander Cherepanov‏ @ch3root 7 Mar 2016
          Replying to @ch3root

          @RichFelker @spun_off type of the object in this case is int. Hence there is nothing that prevents access to it as struct not_s.

          0 replies 0 retweets 0 likes
        9. End of conversation

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