Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.

This is the legacy version of twitter.com. We will be shutting it down on June 1, 2020. Please switch to a supported browser, or disable the extension which masks your browser. You can see a list of supported browsers in our Help Center.

  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

Tweets

Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

Tweets

  • © 2020 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation

      A simple, important mitigation like -fstack-check is a no-op in Clang and broken in GCC: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68065 … https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66479 ….

      2 replies 12 retweets 24 likes
    2. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      It's standard on Windows. In fact, LLVM properly implements stack probes for Windows since it's part of the ABI. Yet not anywhere else.

      1 reply 4 retweets 8 likes
    3. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      Rust, a supposedly memory safe language, still lacks stack safety after they removed the working stack overflow checks in function preludes.

      2 replies 3 retweets 9 likes
    4. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      https://github.com/rust-lang/rust/issues/16012 … is not fixed with no sign of progress. It was obvious that this was going to happen when it was originally done.

      2 replies 1 retweet 6 likes
    5. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      CopperheadOS Retweeted Saul Procterm

      https://twitter.com/pozdnychev/status/876826223850270720 … is an embarrassment for GCC / Clang / *nix. Gaping hole known about for years and properly addressed by Windows.

      CopperheadOS added,

      Saul Procterm @pozdnychev
      Qualys Security Advisory: Stack Clash. 24 CVE, 7 PoCs, 7 LPE exploits; Linux/{Net,Free,Open}BSD/Solaris; i386/amd64: http://www.openwall.com/lists/oss-security/2017/06/19/1 …
      1 reply 6 retweets 20 likes
    6. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      It looks worst for Rust where stack safety was implemented but was prematurely removed to get a 1-3% performance win without doing the work.

      1 reply 1 retweet 7 likes
    7. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      Rust used to use segmented stacks and then moved to simply aborting on stack exhaustion via the same overflow checks in function preludes.

      1 reply 0 retweets 7 likes
    8. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      Happen to be the one that initially pushed to kill seg stacks and use probes but in no way intended / expected premature removal of checks.

      1 reply 0 retweets 1 like
    9. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      CopperheadOS Retweeted CopperheadOS

      Even Windows XP doesn't have this issue. Some time travel: https://twitter.com/CopperheadOS/status/659824199050108928 …. See you all in 2018 when this still hasn't been fixed.

      CopperheadOS added,

      CopperheadOS @CopperheadOS
      Rust removed reliable stack overflow detection before the replacement implementation was ready outside of Windows: https://github.com/rust-lang/rust/pull/27338 ….
      1 reply 0 retweets 6 likes
    10. CopperheadOS‏ @CopperheadOS 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      The Linux kernel uses stack frame size warnings so it mostly avoids this problem but it does have some uses of C99 variable length arrays...

      3 replies 0 retweets 4 likes
      Jann Horn‏ @tehjh 19 Jun 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CopperheadOS

      I think most of the "variable" lengths are actually crypto function properties and related stuff

      9:35 AM - 19 Jun 2017
      2 replies 0 retweets 0 likes
        1. CopperheadOS‏ @CopperheadOS 19 Jun 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @tehjh

          See out-of-tree Qualcomm drivers...

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        1. Jann Horn‏ @tehjh 19 Jun 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @tehjh @CopperheadOS

          I vaguely recall manually going through all the VLA uses at some point and not discovering any unbounded allocations

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2020 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info