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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. CopperheadOS‏ @CopperheadOS 23 Nov 2015
      Replying to @RichFelker

      @RichFelker @ch3root The logic is that valid code constructing a pointer this way must derive it from an existing pointer in practice.

      2 replies 0 retweets 0 likes
    2. CopperheadOS‏ @CopperheadOS 23 Nov 2015
      Replying to @CopperheadOS

      @RichFelker @ch3root It might not be true though... one example is the incorrect __attribute__((malloc)) on strdup in glibc.

      1 reply 1 retweet 1 like
    3. CopperheadOS‏ @CopperheadOS 23 Nov 2015
      Replying to @CopperheadOS

      @RichFelker @ch3root It tells the compiler that the returned data (not just the outer pointer) cannot alias an existing pointer.

      2 replies 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec @ch3root Ouch, that sounds very bad.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 23 Nov 2015
      Replying to @RichFelker

      @RichFelker @ch3root Yeah, look at the description in https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes …. The glibc usage on strdup appears to be completely wrong.

      1 reply 1 retweet 0 likes
    6. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec @ch3root Is there an open bug report for this?

      2 replies 0 retweets 0 likes
    7. Alexander Cherepanov‏ @ch3root 23 Nov 2015
      Replying to @RichFelker

      @RichFelker @CopperheadSec A bug report where? gcc folks say that such things are done according with DR 260.

      2 replies 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @ch3root

      @ch3root @CopperheadSec I mean for the version you sent me, or preferably a variant that's not doing something "obviously wrong" (to them).

      2 replies 0 retweets 0 likes
    9. Alexander Cherepanov‏ @ch3root 23 Nov 2015
      Replying to @RichFelker

      @RichFelker @CopperheadSec I don't think you can selectively rule that a compiler is free to track history for pointers but not for integers

      2 replies 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 23 Nov 2015
      Replying to @ch3root

      @ch3root @CopperheadSec My view is that == operator is insufficient to establish identity; this is only way I see to reconcile with annex J.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 23 Nov 2015

      @ch3root @CopperheadSec OTOH if reprs (or int values, "pure binary") are observed identical I don't see any way 2 justify "tracking history"

      4:53 AM - 23 Nov 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 23 Nov 2015
          Replying to @RichFelker

          @RichFelker @CopperheadSec Yeah, this is the real problem. a + 20 and b have the same repr. Can be used interchangably?

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 23 Nov 2015
          Replying to @ch3root

          @ch3root @CopperheadSec If program never inspects repr I see potential justification for treating them as different.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 23 Nov 2015
          Replying to @RichFelker

          @ch3root @CopperheadSec But if same reprs are observed I see no way the impl can treat them as not the same.

          1 reply 0 retweets 0 likes
        5. Alexander Cherepanov‏ @ch3root 23 Nov 2015
          Replying to @RichFelker

          @RichFelker @CopperheadSec So the example which started this discussion is fine with you?

          1 reply 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker 23 Nov 2015
          Replying to @ch3root

          @ch3root @CopperheadSec For a weird definition of "fine". I see a plausible way to justify it & the code as written is "morally wrong" C. ;)

          1 reply 0 retweets 0 likes
        7. Alexander Cherepanov‏ @ch3root 23 Nov 2015
          Replying to @RichFelker

          @RichFelker @CopperheadSec If you allow it then I guess you cannot optimize all similar cases when iter count is unknown.

          2 replies 0 retweets 1 like
        8. Alexander Cherepanov‏ @ch3root 23 Nov 2015
          Replying to @ch3root

          @RichFelker @CopperheadSec A compiler has to assume that the loop could touch all variables following the original array.

          0 replies 0 retweets 0 likes
        9. End of conversation

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