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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. friend void‏ @volatile_void 12 May 2016

      Today's “this language is broken” courtesy of @ch3root https://godbolt.org/g/H8d0I2 

      7 replies 6 retweets 12 likes
    2. Rich Felker‏ @RichFelker 13 May 2016
      Replying to @volatile_void @ch3root

      As written, the program has UB. But you can eliminate that by adding "if (!p) return 0;" and then clang is wrong.

      3 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker 13 May 2016
      Replying to @RichFelker @ch3root

      Note that gcc does the same as clang without the null pointer check (b/c the code is UB), but does right with check added

      10:13 AM - 13 May 2016
      • 1 Like
      • friend void
      2 replies 0 retweets 1 like
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 13 May 2016
          Replying to @RichFelker

          BTW a nice thing in searching interesting testcases for tis-interpreter is that you are free use any UB in them:-)

          1 reply 0 retweets 0 likes
        3. friend void‏ @volatile_void 13 May 2016
          Replying to @ch3root @RichFelker

          I made the mistake, going in the other direction—tis-interpreter to GCC—of forgetting GCC doesn't have a duty to warn.

          3 replies 0 retweets 0 likes
        4. friend void‏ @volatile_void 13 May 2016
          Replying to @volatile_void @ch3root

          I agree w/@RichFelker GCC isn't doing wrong: it assumes malloc can only return 0 for this input, so the program always runs into UB

          1 reply 0 retweets 0 likes
        5. Alexander Cherepanov‏ @ch3root 13 May 2016
          Replying to @volatile_void @RichFelker

          No. Just replace SIZE_MAX by SIZE_MAX / 4 * 3 and add -m32 and you get a genuine compiler bug.

          2 replies 0 retweets 0 likes
        6. friend void‏ @volatile_void 13 May 2016
          Replying to @ch3root

          well 32-bit GCC still assumes that malloc has to return 0 for this input.

          2 replies 0 retweets 0 likes
        7. friend void‏ @volatile_void 13 May 2016
          Replying to @volatile_void @ch3root

          You say it's not documented but GCC devs kindly & consistently remind anyone who reports this as a bug that GCC assumes this.

          3 replies 0 retweets 0 likes
        8. friend void‏ @volatile_void 13 May 2016
          Replying to @volatile_void @ch3root

          it's not WELL documented. There should be a prominent warning about using GCC with Glibc on 32-bit platforms. (RMS would intervene)

          0 replies 0 retweets 0 likes
        9. End of conversation
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 13 May 2016
          Replying to @RichFelker @ch3root

          Maybe worth trying an aborting malloc wrapper marked with the object size and malloc attributes instead.

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 13 May 2016
          Replying to @CopperheadOS @RichFelker @ch3root

          Doubt GCC is optimizing based on an assumption that the malloc return value has to be checked before use.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 13 May 2016
          Replying to @CopperheadOS @RichFelker @ch3root

          It's incorrect code, but not actually undefined UNTIL the condition it fails to handle actually happens.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 13 May 2016
          Replying to @CopperheadOS @RichFelker @ch3root

          GCC similarly only knows how to do dead store removal for malloc without OOM checks, but Clang handles them.

          0 replies 0 retweets 0 likes
        6. End of conversation

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