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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 31 Jan 2016
      Replying to @mjg59

      @mjg59 @oshepherd Refraining from executing firmware blobs in ring 0 after boot should not require starting over from the beginning.

      2 replies 0 retweets 0 likes
    2.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 1 Feb 2016
      Replying to @RichFelker

      @RichFelker @mjg59 To what end? The firmware is always resident in SMM, so stuff in Ring 0 is the least of your worries...

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 1 Feb 2016
      Replying to @erincandescent

      @oshepherd @mjg59 SMM is another bug to fix, yes, but the existence of bugs at one layer is no excuse for not fixing other layers.

      1 reply 0 retweets 0 likes
    4.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 1 Feb 2016
      Replying to @RichFelker

      @RichFelker @mjg59 if you replace your firmware such that your SMM is trustable then your EFI runtime should be trusted also

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 1 Feb 2016
      Replying to @erincandescent

      @oshepherd @mjg59 I was talking about desoldering/cutting the SMI pin.

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 1 Feb 2016
      Replying to @RichFelker

      @oshepherd @mjg59 Alternatively some chipsets have a register to disable it which the kernel could use, if you trust it.

      1 reply 0 retweets 0 likes
    7.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 1 Feb 2016
      Replying to @RichFelker

      @RichFelker @mjg59 there isn't an SMI pin, and firmware *correctly* blocks writes to that bit

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 1 Feb 2016
      Replying to @erincandescent

      @oshepherd @mjg59 On early models (386-486 era?) there was a pin, and the disable register was available a few years back.

      1 reply 0 retweets 0 likes
    9.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 1 Feb 2016
      Replying to @RichFelker

      @RichFelker @mjg59 since about Pentium it's been a bus cmessage. It has always been possible for SMM to disable the disable register

      1 reply 0 retweets 1 like
    10. Peter Barfuss 𒀱‏ @bofh453 1 Feb 2016
      Replying to @erincandescent

      @oshepherd @RichFelker @mjg59 why exactly is it possible for SMM to disable the ability to disable itsself? That seems silly/insecure.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 1 Feb 2016
      Replying to @bofh453

      Rich Felker Retweeted  🎃 unsafe { mem::transmute(@erincandescent) }  🎃

      @bofh453 @oshepherd @mjg59 Because Intel has a backwards model of which software is trusted and which is not.https://twitter.com/oshepherd/status/694194416303484928 …

      Rich Felker added,

       🎃 unsafe { mem::transmute(@erincandescent) }  🎃 @erincandescent
      Replying to @bofh453
      @bofh453 @RichFelker @mjg59 because SMM is the 'most trusted' code on the system. Like asking why user space can't disable the kernel
      9:25 AM - 1 Feb 2016
      0 replies 0 retweets 0 likes

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