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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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    Patrick Walton‏ @pcwalton 11 Nov 2019
    • Report Tweet
    • Report NetzDG Violation

    Patrick Walton Retweeted Robᵉʳᵗ Graham 😷

    Calling a *checked* stack overflow a "buffer overflow" is totally disingenuous.https://twitter.com/ErrataRob/status/1193242295207899141 …

    Patrick Walton added,

    Robᵉʳᵗ Graham 😷 @ErrataRob
    Replying to @ErrataRob @ryanlrussell and 2 others
    For example, somebody decided to write a "safe" DNS server in Rust (a memory safe language). And then it had a buffer overflow in parsing "name compression recursion" -- which is the most obvious and frequent bug in DNS packet decoding.
    8:26 AM - 11 Nov 2019
    • 4 Retweets
    • 95 Likes
    • Connor Valentin Goșu 🇷🇴🤓🦖🦊 Molly Greg Jandl Henk Poley Rhaladriel Tobias in Zeiten von Corona Jasper Siepkes Keshav Kini
    6 replies 4 retweets 95 likes
      1. New conversation
      2. Paul Crowley‏ @ciphergoth 11 Nov 2019
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        Replying to @pcwalton

        Paul Crowley Retweeted Robᵉʳᵗ Graham 😷

        He seems to think stack overflows are not always checked.https://twitter.com/ErrataRob/status/1193243682444578816 …

        Paul Crowley added,

        Robᵉʳᵗ Graham 😷 @ErrataRob
        Replying to @ryanlrussell @dakami @tqbf
        Stack space exhaustion, which apparently is checked in some builds of Rust, but could be exploitable in others.
        1 reply 0 retweets 4 likes
      3. Patrick Walton‏ @pcwalton 11 Nov 2019
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        Replying to @ciphergoth

        There's always a guard page and at least on most platforms there is a stack probe as well for large activation records. Alloca is forbidden so that avenue of exploitation is closed off. So this is unexploitable on x86 and is probably unexploitable elsewhere too.

        2 replies 0 retweets 14 likes
      4. 1 more reply
      1. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 11 Nov 2019
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        Replying to @pcwalton

        I love how I have most of the people in that thread blocked

        0 replies 0 retweets 18 likes
        Thanks. Twitter will use this to make your timeline better. Undo
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      1. andreasdotorg‏ @andreasdotorg 11 Nov 2019
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        Replying to @pcwalton

        My brain hurts from just reading a few tweets, can't finish the thread.

        0 replies 0 retweets 6 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Anthony Ramine‏ @nokusu 12 Nov 2019
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        Replying to @pcwalton

        I mean, the dude got Errata in his name…

        0 replies 0 retweets 3 likes
        Thanks. Twitter will use this to make your timeline better. Undo
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      1. New conversation
      2. Edward‏ @inwardshed 11 Nov 2019
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        Replying to @pcwalton

        When I wrote an mDNS parser in C, the biggest issue was all the pointer arithmetic for following the name compression, not really the size of the decompression buffer. Either way, Rust would’ve helped a ton, as verifying that thing was awful (ended up just throwing AFL at it)

        1 reply 0 retweets 2 likes
      3. Edward‏ @inwardshed 11 Nov 2019
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        Replying to @inwardshed @pcwalton

        Isn’t doing the decompression recursively also a bit naive? Mine was for embedded so not sure what other implementations are like. The size of the packet is bounded, but the pointers can go to arbitrary depth, so I did it iteratively and threw in guardrails for length and depth.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Kyle Huey‏ @khuey_ 11 Nov 2019
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        Replying to @pcwalton

        why does anybody still pay attention to that guy?

        1 reply 0 retweets 11 likes
      3. 1 more reply

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