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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 7 Nov 2015

      The PTRDIFF_MAX object size limit needed to be extended to mremap too: https://android-review.googlesource.com/#/c/181202/  http://www.openwall.com/lists/musl/2015/10/31/1 ….

      1 reply 1 retweet 1 like
    2. CopperheadOS‏ @CopperheadOS 7 Nov 2015
      Replying to @CopperheadOS

      The issue still exists in AOSP master because jemalloc merges ranges of virtual memory. Hopefully our patch lands: https://github.com/jemalloc/jemalloc/pull/295 ….

      1 reply 0 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS 7 Nov 2015
      Replying to @CopperheadOS

      It's fully dealt with for OpenBSD malloc in CopperheadOS and the alternative AOSP dlmalloc allocator since they don't merge mmap regions.

      1 reply 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 7 Nov 2015
      Replying to @CopperheadOS

      Not doing this leads to various classes of bugs: end - start will overflow, ptr + size is undefined/broken in GCC and Clang and there are...

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 7 Nov 2015
      Replying to @CopperheadOS

      ... many API signatures (read, write, pread, [...]) and internal implementation details where ssize_t and ptrdiff_t fall short without this.

      1 reply 0 retweets 0 likes
    6. CopperheadOS‏ @CopperheadOS 7 Nov 2015
      Replying to @CopperheadOS

      The PTRDIFF_MAX checks in @musllibc are by far the sanest way of dealing with these issues and should be adopted elsewhere. Not just Bionic.

      1 reply 2 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 7 Nov 2015
      Replying to @CopperheadOS

      Changing all code using end - start, ptr + size, ptrdiff_t and similar patterns for arbitrary objects is unrealistic. Just fix it in libc.

      1 reply 1 retweet 0 likes
    8. the grugq‏ @thegrugq 7 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec why not just fix the bugs? You’re actually advocating leave bugs in the wild????!!!!?

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 12 Nov 2015
      Replying to @thegrugq

      @thegrugq @CopperheadSec There's not even a clear party to blame for the "bug". Overflows in reasonable pointer arith. = hopelessly bad QoI.

      3:51 PM - 12 Nov 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 12 Nov 2015
          Replying to @RichFelker

          @RichFelker @thegrugq The standard should really just forbid objects larger than PTRDIFF_MAX but they're too afraid of breaking anything.

          1 reply 0 retweets 1 like
        3. CopperheadOS‏ @CopperheadOS 12 Nov 2015
          Replying to @CopperheadOS

          @RichFelker @thegrugq Could be done on the kernel's side of the syscalls but that's never going to happen on Linux (maybe in @grsecurity).

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 12 Nov 2015
          Replying to @CopperheadOS

          @RichFelker @thegrugq @grsecurity The merging of memory spans in jemalloc is a case where the kernel doing it wouldn't be enough though.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 12 Nov 2015
          Replying to @CopperheadOS

          @CopperheadSec @thegrugq @grsecurity Kernel could ensure it never maps >PTRDIFF_MAX worth of contiguous virtual memory.

          0 replies 0 retweets 0 likes
        6. End of conversation

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