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kees_cook's profile
𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔
𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔
𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔
@kees_cook

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𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔

@kees_cook

Free Software Hacker

Portland, OR, USA
outflux.net/blog
Joined February 2010

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    1. Dino A. Dai Zovi‏ @dinodaizovi 23 Feb 2017
      Replying to @jcase

      Sounds like more of a risk for production environments than mobile then.

      1 reply 1 retweet 0 likes
    2. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @dinodaizovi @jcase

      @solardiz Not if they use grsecurity kernels though since MODHARDEN will prevent non-root users triggering auto-loading.

      1 reply 1 retweet 0 likes
    3. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @CopperheadOS @dinodaizovi and

      Unless they actually use this functionality. Android kernels are very minimal, Nexus/Pixel don't use modules.

      1 reply 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @CopperheadOS @dinodaizovi and

      Most distribution kernels build nearly everything as modules and a lot of it is reachable via auto-loading.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @CopperheadOS @dinodaizovi and

      They even ship modules for hardware that never actually shipped or isn't available for the architecture.

      1 reply 0 retweets 0 likes
    6. Solar Designer‏ @solardiz 24 Feb 2017
      Replying to @CopperheadOS

      @kees_cook Any attempt to upstream MODHARDEN after http://lists.openwall.net/linux-kernel/2010/11/08/11 …? We have https://outflux.net/blog/archives/2012/11/28/clean-module-disabling/ … but it's not same.

      2 replies 0 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @solardiz @kees_cook

      Don't know. Only focus on Android now so don't pay much attention to stuff like this or areas covered by SELinux.

      1 reply 0 retweets 0 likes
    8. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @CopperheadOS @solardiz @kees_cook

      MODHARDEN is one of many grsecurity features that are very useful on desktops but not at all for the niche we focus on.

      1 reply 0 retweets 0 likes
    9. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @CopperheadOS @solardiz @kees_cook

      Actually applies to *most* of the named grsecurity features that it adds on top of PaX, but there are unnamed changes.

      1 reply 0 retweets 0 likes
    10. CopperheadOS‏ @CopperheadOS 24 Feb 2017
      Replying to @CopperheadOS @solardiz @kees_cook

      KSTACKOVERFLOW was one of the exceptions but that's now copied in an inferior way (debugging it sucks) upstream.

      1 reply 0 retweets 0 likes
      𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔‏ @kees_cook 24 Feb 2017
      Replying to @CopperheadOS @solardiz

      grsec's is x86 only, in 2 parts: thread_info move & vmap stack. upstream has both on x86 and former on arm64 & s390

      10:01 AM - 24 Feb 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. PaX Team‏ @paxteam 27 Feb 2017
          Replying to @kees_cook @CopperheadOS @solardiz

          the NIH'd version of vmap stack is full of bugs, still a whack-a-mole game a few releases later.

          1 reply 2 retweets 1 like
        3. 𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔‏ @kees_cook 27 Feb 2017
          Replying to @paxteam @CopperheadOS @solardiz

          Understood. There are many paths to getting things into upstream and stabilization can be one of the costs.

          1 reply 0 retweets 0 likes
        4. PaX Team‏ @paxteam 27 Feb 2017
          Replying to @kees_cook @CopperheadOS @solardiz

          IMHO bugs due to entirely avoidable design errors (NIH) are simply irresponsible and bad engineering.

          1 reply 0 retweets 1 like
        5. 𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔‏ @kees_cook 27 Feb 2017
          Replying to @paxteam @CopperheadOS @solardiz

          As you know, the way to change upstream Linux kernel engineering practices is to participate directly :)

          1 reply 0 retweets 0 likes
        6. PaX Team‏ @paxteam 27 Feb 2017
          Replying to @kees_cook @CopperheadOS @solardiz

          pointless when stuff like __ro_after_init and now refcount_t can go in despite being bad engineering...

          1 reply 0 retweets 1 like
        7. 𝙺𝚎𝚎𝚜 𝙲𝚘𝚘𝚔‏ @kees_cook 27 Feb 2017
          Replying to @paxteam @CopperheadOS @solardiz

          I don't share your "bad engineering" opinion, and I think your involvement wouldn't be pointless at all.

          1 reply 0 retweets 0 likes
        8. PaX Team‏ @paxteam 27 Feb 2017
          Replying to @kees_cook @CopperheadOS @solardiz

          i did discuss those two (mis)features at the time to no avail. guess we just have different standards ;).

          0 replies 0 retweets 0 likes
        9. End of conversation

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