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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. Daniel Gruss‏ @lavados 15 Mar 2016

      Mark Lanteigne (ThirdIO) continued our research on #rowhammer \w #DDR4. 8 out of 12 modules vulnerable. A must read. http://www.thirdio.com/rowhammer.pdf 

      1 reply 51 retweets 49 likes
    2. Daniel Gruss‏ @lavados 15 Mar 2016
      Replying to @lavados

      @lavados against various claims, #DDR4 is NOT safe against #rowhammer. It's great to have this confirmed with numbers on the prevalence now.

      1 reply 8 retweets 8 likes
      Rich Felker‏ @RichFelker 15 Mar 2016
      Replying to @lavados

      @lavados So how DO you mitigate rowhammer?

      10:09 PM - 15 Mar 2016
      • 2 Likes
      • Patrik Ragnarsson Daniel Gruss
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Daniel Gruss‏ @lavados 16 Mar 2016
          Replying to @RichFelker

          @RichFelker as we said in our ccc talk... We don't prevent bitflips. We only need to make sure they can't occur across privilege boundaries

          1 reply 0 retweets 1 like
        3. jawnv6‏ @jawnv6 21 Mar 2016
          Replying to @lavados

          @lavados is that distinction meaningful? part of the problem is HW can't detect victim rows w/ fine enough grain. or do you mean harden SW?

          1 reply 0 retweets 0 likes
        4. Daniel Gruss‏ @lavados 21 Mar 2016
          Replying to @jawnv6

          @jawnv6 you can only hammer rows in physical proximity. OS memory allocators could prevent that and partially do that already today.

          1 reply 0 retweets 0 likes
        5. jawnv6‏ @jawnv6 21 Mar 2016
          Replying to @lavados

          @lavados but if you knew where the victim rows were, the MC could just trigger refresh. there's swizzling that prevents this total knowledge

          1 reply 0 retweets 0 likes
        6. Daniel Gruss‏ @lavados 21 Mar 2016
          Replying to @jawnv6

          @jawnv6 there is not 1 victim row... on all dram i had access to i found thousands of possible victim rows....

          1 reply 0 retweets 0 likes
        7. jawnv6‏ @jawnv6 21 Mar 2016
          Replying to @lavados

          @lavados just because you can empirically extract the info later doesn't mean it's available/usable to the relevant system agents at runtime

          2 replies 0 retweets 0 likes
        8. Daniel Gruss‏ @lavados 21 Mar 2016
          Replying to @jawnv6

          @jawnv6 exactly my point. that's the exact reason why I wouldn't try to protect victim rows or refresh them more often or anything like that

          0 replies 0 retweets 0 likes
        9. End of conversation

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