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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Patrick Walton‏ @pcwalton 5 Jan 2018
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      Replying to @pwnallthethings @fugueish and

      Are you referring to retpolines? Browsers and JS are *extremely* virtual call heavy. Perf impact must be carefully considered.

      1 reply 0 retweets 0 likes
    2. Patrick Walton‏ @pcwalton 5 Jan 2018
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      Replying to @pcwalton @pwnallthethings and

      I haven’t measured, but my guess is that nobody can realistically deploy retpolines for perf reasons. Would be happy to be proven wrong.

      1 reply 0 retweets 0 likes
    3. Eric Christopher‏ @echristo 5 Jan 2018
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      Replying to @pcwalton @pwnallthethings and

      @chandlerc1024 gave the performance impact of a not dissimilar c++ application when posting the retpoline work. Devirtualization and pgo/lto helps a lot though.

      3 replies 0 retweets 1 like
    4. Chandler Carruth‏ @chandlerc1024 5 Jan 2018
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      Replying to @echristo @pcwalton and

      Plus, you only need to retpoline the executable code running within the address space with the victim data and attacker untrusted code. Still, I agree with @fugueish here - best long term strategy is isolation. For short term, v2 may not be the most urgent...

      2 replies 0 retweets 1 like
    5. Patrick Walton‏ @pcwalton 6 Jan 2018
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      Replying to @chandlerc1024 @echristo and

      Are you all sure that process isolation is a foolproof solution? Different address spaces on same core share a cache…

      1 reply 0 retweets 0 likes
    6. Patrick Walton‏ @pcwalton 6 Jan 2018
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      Replying to @pcwalton @chandlerc1024 and

      See “same-CPU cross process” on https://github.com/marcan/speculation-bugs/blob/master/README.md … — @marcan42 seems to agree that cross process is potentially vulnerable too…

      1 reply 0 retweets 1 like
    7. Hector Martin‏ @marcan42 6 Jan 2018
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      Replying to @pcwalton @chandlerc1024 and

      Yeah, the only complete solutions are full IBRS/IBPB (enabled in both the kernel and userspace) or using retpolines everywhere, AFAICT.

      1 reply 0 retweets 1 like
    8. comex‏ @comex 6 Jan 2018
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      Replying to @marcan42 @pcwalton and

      and as I suppose you know, those are only complete solutions for variant 2, don’t help with 1

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 6 Jan 2018
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      Replying to @comex @pcwalton and

      Of course. Insert rant about calling two different vulns by the same name. As I mentioned on the doc and Reddit, I don't think there's a fix for variant 1 other than making speculation barriers part of the CS curriculum.

      9:50 PM - 6 Jan 2018
      0 replies 0 retweets 0 likes

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