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__agwa's profile
Andrew Ayer
Andrew Ayer
Andrew Ayer
@__agwa

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Andrew Ayer

@__agwa

Bootstrapped founder of @SSLMate, where I make SSL certificates easier and do #webpki and #CertificateTransparency stuff.

Cambridge, MA + SF Bay Area
agwa.name
Joined November 2011

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    1. Cloudflare | #BuiltForThis‏Verified account @Cloudflare 23 Feb 2017
      • Report Tweet
      • Report NetzDG Violation

      Incident report on memory leak caused by Cloudflare parser bug -http://buff.ly/2lB3gCe 

      20 replies 1,001 retweets 560 likes
      Andrew Ayer‏ @__agwa 23 Feb 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @Cloudflare

      Incorrect statement from @Cloudflare. Creating and comparing invalid pointer in C is undefined behavior. Post-hoc >= check doesn't cut it.pic.twitter.com/FdiVhvbSBF

      4:35 PM - 23 Feb 2017
      • 29 Retweets
      • 79 Likes
      • Alex Chekunkov Micah Boswell mqklin Jaden Geller 🧚 secnetica Greg Stoll Lee Mallon Makis Dim Apoorv Singh
      6 replies 29 retweets 79 likes
        1. New conversation
        2. Ingvar Stepanyan‏ @RReverser 23 Feb 2017
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          Replying to @__agwa @Cloudflare

          Both pointers were valid and pointer to data in Nginx buffer (which is why bug happened in the first place).

          1 reply 0 retweets 5 likes
        3. Andrew Ayer‏ @__agwa 23 Feb 2017
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          Replying to @RReverser @Cloudflare

          Blog says repeatedly "past the end of the buffer." Is that not accurate?

          1 reply 0 retweets 0 likes
        4. 7 more replies
        1. New conversation
        2. Moritz Kiefer‏ @cocreature 23 Feb 2017
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          Replying to @__agwa @Cloudflare

          A pointer one past the end is valid and the blog post suggest that this is what is being used here?

          1 reply 0 retweets 2 likes
        3. Andrew Ayer‏ @__agwa 24 Feb 2017
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          Replying to @cocreature @Cloudflare

          No. pe is one past end, so == suffices. p went beyond even that.

          1 reply 0 retweets 1 like
        4. 1 more reply
        1. New conversation
        2. datenwolf - flausching the curve‏ @datenwolf 25 Feb 2017
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          Replying to @__agwa @Cloudflare

          Depends on the exact circumstances. If `++p` went _exactly_ one element past the buffer, then IT IS valid and defined.

          1 reply 0 retweets 0 likes
        3. Andrew Ayer‏ @__agwa 25 Feb 2017
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          Replying to @datenwolf

          Yes, one past end is valid and would have been caught by p == pe. In this case, pointer went beyond that.

          1 reply 0 retweets 0 likes
        4. 1 more reply
        1. datenwolf - flausching the curve‏ @datenwolf 25 Feb 2017
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          Replying to @__agwa @Cloudflare

          That's why in general in C one doesn't use pointers for buffer bounds checks. Use index variables and check those.

          0 replies 0 retweets 1 like
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        1. New conversation
        2. andreasdotorg‏ @andreasdotorg 24 Feb 2017
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          Replying to @__agwa

          Not by the standard, but most likely by implementation. This time. Unless overflow.

          1 reply 0 retweets 1 like
        3. William D. Jones‏ @cr1901 25 Feb 2017
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          Replying to @andreasdotorg @__agwa

          I don't remember where it says *creating* an invalid pointer is UB. >>

          2 replies 0 retweets 0 likes
        4. 1 more reply
        1. John-Mark Gurney  🗑️ 🔥‏ @encthenet 25 Feb 2017
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          Replying to @__agwa @Cloudflare

          thanks for pointing this out. I noticed that too.

          0 replies 0 retweets 0 likes
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