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tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

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Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

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    1. CopperheadOS‏ @CopperheadOS 8 Oct 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @ebeip90

      It's used to implement pthread_attr_getstack to get the main thread stack base but not sure if anything interesting uses that. CopperheadOS calls it in libc init to save the main thread stack base for use in the dynamic object size checks (fast path for data on current stack).

      1 reply 0 retweets 2 likes
    2. Zach Riggle‏ @ebeip90 8 Oct 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      Assume you have code execution in the "forging" process already. Need something interesting to parse /maps in a dangerous way.

      1 reply 0 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS 8 Oct 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @ebeip90

      Ah, can't think of anything then, especially in Oreo where debuggerd is gone and replaced with unprivileged crash dumping code spawned from the app.

      1 reply 0 retweets 0 likes
    4. Zach Riggle‏ @ebeip90 8 Oct 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      I still don't know why we don't just use `/proc/sys/kernel/core_pattern` with the pipe feature.

      1 reply 0 retweets 3 likes
      Jann Horn‏ @tehjh 8 Oct 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @ebeip90 @CopperheadOS

      it would probably be easier to run out of resources that way? if the disk is full and the crashing app uses 50% of RAM?

      8:39 PM - 8 Oct 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Jann Horn‏ @tehjh 8 Oct 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @tehjh @ebeip90 @CopperheadOS

          ptrace / /proc/$pid/mem gives you arbitrary read, pipe core_pattern doesn't

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 8 Oct 2017
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          Replying to @tehjh @ebeip90

          Now that debuggerd is gone it doesn't really matter anymore beyond forbidding self-ptrace which isn't very important.

          0 replies 0 retweets 0 likes
        4. End of conversation

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