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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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    Rich Felker‏ @RichFelker 25 Jan 2016

    Rich Felker Retweeted Stefan Esser

    Uhg as if the kernel doesn't already have a big enough attack surface...https://twitter.com/i0n1c/status/691758367166046212 …

    Rich Felker added,

    Stefan EsserVerified account @i0n1c
    To speed up code the kernel should have a jit that generates kernel code for snippets of user space code #thoughtleader #maxperformance
    8:59 PM - 25 Jan 2016
    • 3 Retweets
    • 4 Likes
    • Guillaume Ceccarelli John Regehr Ben Rachinger immaterial girl, but spooky Ben Zanin Mark C.
    2 replies 3 retweets 4 likes
      1. New conversation
      2. CopperheadOS‏ @CopperheadOS 29 Jan 2016
        Replying to @RichFelker

        @RichFelker Sadly, it already exists: the BPF JIT compiler. It has been getting increasingly complex and more difficult to harden too.

        1 reply 1 retweet 1 like
      3. John Regehr‏ @johnregehr 29 Jan 2016
        Replying to @CopperheadOS

        @CopperheadSec @RichFelker most of the "extensible OS" ideas from the 90s died for good reasons

        1 reply 0 retweets 0 likes
      4. CopperheadOS‏ @CopperheadOS 29 Jan 2016
        Replying to @johnregehr

        @johnregehr @RichFelker At least it's disabled by default on Linux, unlike some other platforms with this (mis)feature. Still quite scary...

        1 reply 0 retweets 0 likes
      5. John Regehr‏ @johnregehr 29 Jan 2016
        Replying to @CopperheadOS

        @CopperheadSec @RichFelker this is cool though http://syslab.cs.washington.edu/papers/jitk-osdi14.pdf …

        1 reply 0 retweets 0 likes
      6. CopperheadOS‏ @CopperheadOS 29 Jan 2016
        Replying to @johnregehr

        @johnregehr @RichFelker Correctness is only one aspect though. Either way, the attacker has a great way to generate an executable payload.

        1 reply 0 retweets 0 likes
      7. CopperheadOS‏ @CopperheadOS 29 Jan 2016
        Replying to @CopperheadOS

        @johnregehr @RichFelker There used to be a good implementation of JIT hardening in @grsecurity to make that much more difficult but not now.

        1 reply 0 retweets 0 likes
      8. CopperheadOS‏ @CopperheadOS 29 Jan 2016
        Replying to @CopperheadOS

        @johnregehr @RichFelker @grsecurity eBPF made the feature much more complex and scary so earlier work isn't directly applicable anymore.

        0 replies 0 retweets 1 like
      9. End of conversation
      1. Enno Boland‏ @Gottox 26 Jan 2016
        Replying to @RichFelker

        @RichFelker @i0n1c As we all know, kernel code automatically runs faster than user space code.

        0 replies 0 retweets 1 like
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