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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 Jan 4

    Hot take: this whole retpoline thing is a steaming pile of shit. All it does is let Intel (& others) claim "not a flaw". If ability to run existing binaries safely is not one of your requirements, throw out x86 already.

    10:59 AM - 4 Jan 2018
    • 17 Retweets
    • 40 Likes
    • Alexander Tarasikov Mikael Silvén viraptor Gza Paul Harvey Joe Savage Content of Media whitequark Haunted Mind
    4 replies 17 retweets 40 likes
      1. Rich Felker‏ @RichFelker Jan 4

        With that said, it is amazingly clever and certainly some ppl want it as a short-term mitigation. https://support.google.com/faqs/answer/7625886 …

        0 replies 2 retweets 3 likes
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      1. New conversation
      2. ɐɯǝʇǝʞ uǝoɹǝſ (華天馬・ユルン)‏ @TerminateThread Jan 4
        Replying to @RichFelker

        I wonder if this will simply start an arms race: Intel et al. make a branch predictor that sees through this, and then the whole things starts all over again.

        1 reply 1 retweet 3 likes
      3. Jon Roelofs‏ @jon_roelofs Jan 4
        Replying to @TerminateThread @RichFelker

        that /is/ my experience with how well hardware teams communicate with compiler teams :/

        1 reply 1 retweet 4 likes
      4. Jon Roelofs‏ @jon_roelofs Jan 4
        Replying to @jon_roelofs @TerminateThread @RichFelker

        IMO, they should be the same team. Chip mfr’s that figure that out will do much better in the long run.

        1 reply 0 retweets 0 likes
      5. ɐɯǝʇǝʞ uǝoɹǝſ (華天馬・ユルン)‏ @TerminateThread Jan 4
        Replying to @jon_roelofs

        Not sure if they should be the same team, but they should be close and talk to each other often. At the very least this will lead to chip designs with features that can actually be exploited sanely in compilers. But that's going at bit off-topic here.

        2 replies 0 retweets 2 likes
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      2. Real AI‏ @Luiz0x29A Jan 4
        Replying to @RichFelker

        "If ability to run existing binaries safely IS one of your requirements, throw out x86 already"

        1 reply 1 retweet 0 likes
      3. Real AI‏ @Luiz0x29A Jan 4
        Replying to @Luiz0x29A @RichFelker

        throw out the C language too when you're at it (throw the entire baby with the water and the bathtub too, they are all rotten)

        0 replies 1 retweet 1 like
      4. End of conversation
      1. New conversation
      2. Alastair Houghton‏ @al45tair Jan 5
        Replying to @RichFelker @mpweiher

        It isn’t just x86 that’s vulnerable here. The ideas behind the attack work on other CPU architectures with speculative execution.

        1 reply 0 retweets 0 likes
      3. Kevin Choi‏ @flamedoge Jan 5
        Replying to @al45tair @RichFelker @mpweiher

        the idea is that CPU leaves behind side effects from failed speculative execution unbeknownst to the program

        1 reply 0 retweets 0 likes
      4. Alastair Houghton‏ @al45tair Jan 5
        Replying to @flamedoge @RichFelker @mpweiher

        More specifically, the cache and BTB don’t roll back if speculation fails. Normal code doesn’t care about that — and it wasn’t obvious that it was exploitable.

        0 replies 1 retweet 1 like
      5. End of conversation

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