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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. Rich Felker‏ @RichFelker 11 Dec 2015

      glibc is about to effectively turn off ASLR by default on x86_64 because some broken Intel chips are 3% slower. https://sourceware.org/ml/libc-alpha/2015-12/msg00221.html …

      21 replies 202 retweets 99 likes
    2. Solar Designer‏ @solardiz 11 Dec 2015
      Replying to @RichFelker

      @RichFelker The patch isn't exactly that bad: it severely limits ASLR (to 32-bit) on Silvermont (only). Needs further refinement.

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 11 Dec 2015
      Replying to @solardiz

      @solardiz "32-bit" ASLR is at best 20-bit and actually more like 16-bit. Trivial to brute-force, e.g. in suids.

      2 replies 1 retweet 2 likes
    4. Solar Designer‏ @solardiz 11 Dec 2015
      Replying to @RichFelker

      @RichFelker Sure, but for remote attacks and eventual lockout (which we need upstreamed in the kernel), "32-bit" ASLR is better than nothing

      2 replies 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 11 Dec 2015
      Replying to @solardiz

      @solardiz @RichFelker Remote attacks can often be retried over and over again thanks to service respawning, even if it's throttled.

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 11 Dec 2015
      Replying to @CopperheadOS

      @CopperheadSec @solardiz And it's not clear to me that everyone would want to trade this for a lock-out type behavior.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 11 Dec 2015

      @CopperheadSec @solardiz Lockout after several crashes transforms momentary-DoS-only bugs into effective long-term DoS attacks.

      10:22 AM - 11 Dec 2015
      • 2 Likes
      • Joachim Schipper Julien Savoie
      1 reply 0 retweets 2 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 11 Dec 2015
          Replying to @RichFelker

          @RichFelker @solardiz Yeah, and respawning tends to be the default or at least strongly encouraged by service supervisors.

          2 replies 0 retweets 0 likes
        3. Solar Designer‏ @solardiz 11 Dec 2015
          Replying to @CopperheadOS

          @CopperheadSec @RichFelker OTOH, it's surprising that Red Hat sets kernel.panic_on_oops by default, favoring integrity over availability

          1 reply 0 retweets 1 like
        4. CopperheadOS‏ @CopperheadOS 11 Dec 2015
          Replying to @solardiz

          @solardiz @RichFelker FWIW, Android sets kernel.panic_on_oops too. There's little choice without PaX since there's no anti-brute-force.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 11 Dec 2015
          Replying to @CopperheadOS

          @solardiz @RichFelker Since the choice is between allowing any number of crashes with no throttling or panicking after the first one.

          1 reply 0 retweets 1 like
        6. Rich Felker‏ @RichFelker 11 Dec 2015
          Replying to @CopperheadOS

          @CopperheadSec @solardiz Well when the crash is in kernel space it rather makes sense to treat the whole kernel as compromised and panic.

          2 replies 0 retweets 1 like
        7. Rich Felker‏ @RichFelker 11 Dec 2015
          Replying to @RichFelker

          @CopperheadSec @solardiz I think panic_on_oops is a very different issue from locking out crashing user processes.

          0 replies 0 retweets 0 likes
        8. End of conversation

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