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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. DanielMicay‏ @DanielMicay 17 Apr 2019
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      Replying to @vyodaiken @RichFelker and

      No, that's not what he means. He's saying that an external file system should have a sandboxed filesystem driver, so that exploiting a bug inside it doesn't immediately grant complete control over the entire system and at least requires privesc to escape (likely via the kernel).

      1 reply 0 retweets 4 likes
    2. DanielMicay‏ @DanielMicay 17 Apr 2019
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      Replying to @DanielMicay @vyodaiken and

      Try reading the overview in https://events.linuxfoundation.org/wp-content/uploads/2017/11/Syzbot-and-the-Tale-of-Thousand-Kernel-Bugs-Dmitry-Vyukov-Google.pdf …. Finding a Linux kernel vulnerability is not hard. Literally hundreds of bugs are found by syszkiller every month and many are not fixed. Most are memory corruption. There are simply too many to even fix all discovered bugs.

      2 replies 0 retweets 6 likes
    3. John Regehr‏ @johnregehr 17 Apr 2019
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      Replying to @DanielMicay @vyodaiken and

      yes, we don't need to debate the question "can people write memory safe code in C" the answer is overwhelmingly obvious to almost all of us

      4 replies 1 retweet 21 likes
    4. John Regehr‏ @johnregehr 17 Apr 2019
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      Replying to @vyodaiken @DanielMicay and

      Victor what is your interpretation of the results presented in the syzkaller slide deck?

      0 replies 0 retweets 1 like
    5. John Regehr‏ @johnregehr 17 Apr 2019
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      Replying to @vyodaiken @DanielMicay and

      ok! so then would it be fair to say that you don't believe these bugs reflect any sort of shortcoming in the C language, but rather they all stem from ineptitude or a refusal to follow best practices?

      0 replies 0 retweets 1 like
      Patrick Walton‏ @pcwalton 17 Apr 2019
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      Replying to @vyodaiken @johnregehr and

      Static analysis has had very little to show for C, because the language is fundamentally hostile to it. Dynamic mitigations have been much more effective.

      1:10 PM - 17 Apr 2019
      • 4 Likes
      • Syahmi SHM You and 52 others bill huey (hui) DanielMicay
      0 replies 0 retweets 4 likes
        1. New conversation
        2. bill huey (hui)‏ @billhuey 17 Apr 2019
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          Replying to @vyodaiken @pcwalton and

          Has to do with the style of code as well as the libraries you link to. The use of unbounded structures and imprecisely tracked memory objects adds to that mix In order for static analysis to be useful, code has to be written to allow for deep analysis

          1 reply 0 retweets 0 likes
        3. 32 more replies

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