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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 14 Dec 2018
    • Report Tweet
    • Report NetzDG Violation

    Hipp (SQLite author) argued with me once, and I eventually conceded, that memory safety isn’t important if you have 100% branch coverage (and moreover that memory safety is undesirable since it slows dev velocity). Looks like I shouldn’t have conceded the argument.

    5:42 PM - 14 Dec 2018
    • 49 Retweets
    • 269 Likes
    • MⒶrtin HⒶboⓋštiak [BEFORE! Jan/3➞₿🔑∎, LNP/BP] ʟʟoɢiq Kartik Talwar ASasAS Daniel Collin 🦀 Erin ✨💽 sean Jonathan Gob #! 🧟‍♂️ jameschurchman
    15 replies 49 retweets 269 likes
      1. New conversation
      2. Mali Akmanalp‏ @makmanalp 14 Dec 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @pcwalton

        A solution that relies on constant vigilance is just so much harder than a language in which that class of bugs just isn’t a thing.

        1 reply 0 retweets 13 likes
      3. Mali Akmanalp‏ @makmanalp 14 Dec 2018
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        Replying to @makmanalp @pcwalton

        But also I could see perhaps that the tools back then were not as advanced as tools today: 15 years ago I don’t think many people could imagine writing SQLite in many things other than C

        2 replies 0 retweets 8 likes
      4. 4 more replies
      1. New conversation
      2. Constructive lawlessness‏ @TheEpsylon 14 Dec 2018
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        Replying to @pcwalton

        Time to dust off that bad boy (credit @mononcqc)pic.twitter.com/lx3plP86if

        2 replies 15 retweets 93 likes
      3. Mohamad Fob‏ @MohamadFob 15 Dec 2018
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        Replying to @TheEpsylon @pcwalton @mononcqc

        cve?????

        1 reply 0 retweets 0 likes
      4. 1 more reply
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      2. Jiliac‏ @Jilyac 14 Dec 2018
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        Replying to @pcwalton

        100% branch coverage doesn't mean you covered all possible behavior at all.

        1 reply 3 retweets 14 likes
      3. absurdist midnight  🌙 bugfixer child‏ @marcoonroad 14 Dec 2018
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        Replying to @Jilyac @pcwalton

        that's why fuzzy / property / quick tests matter. they cover data space rather code space, but cause there are possibly infinite data for given datatype (e.g, strings), such kind of tests are only an approximation. still better than nothing :)

        1 reply 1 retweet 3 likes
      4. 1 more reply
      1. Jed Davis  🏳️‍🌈‏ @xlerb 14 Dec 2018
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        Replying to @pcwalton

        AFL found bugs in SQLite (https://lcamtuf.blogspot.com/2015/04/finding-bugs-in-sqlite-easy-way.html …), including some that look exploitable given hostile SQL, and I'm pretty sure that was after it already had 100% branch coverage.

        0 replies 1 retweet 29 likes
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      2. Scott Michaud‏ @scottmichaud 14 Dec 2018
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        Replying to @pcwalton

        Wat? That guy's argument doesn't even make sense. Unit tests define a spec... they don't test whether 100% of the code works... they ensure that 100% of the code defines the behaviour you want to define. The concern is that the undefined behaviour isn't understood...

        1 reply 0 retweets 5 likes
      3. Scott Michaud‏ @scottmichaud 14 Dec 2018
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        Replying to @scottmichaud @pcwalton

        Like... there's multiple ways to define a min and max function if you account for infinites and NaNs. If you don't care? You don't need to define those test cases. As soon as you do care, then you need to define them so the rug isn't pulled out from under you.

        1 reply 0 retweets 7 likes
      4. 1 more reply
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      2. Sam Tobin-Hochstadt‏ @samth 15 Dec 2018
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        Replying to @pcwalton

        He basically admits as much here: https://news.ycombinator.com/item?id=18687955 …

        2 replies 1 retweet 13 likes
      3. Kristopher Micinski‏ @krismicinski 15 Dec 2018
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        Replying to @samth @pcwalton

        I'm interested in the backstory: was there a memory safety vuln in sqlite or something recently..?

        1 reply 0 retweets 1 like
      4. 3 more replies

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