This bug is fucking awesome.pic.twitter.com/q0PFeDP8Il
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.
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
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
By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.
| 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 | ||
This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.
Hover over the profile pic and click the Following button to unfollow any account.
When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.
The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.
Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.
Get instant insight into what people are talking about now.
Follow more accounts to get instant updates about topics you care about.
See the latest conversations about any topic instantly.
Catch up instantly on the best stories happening as they unfold.
This bug is fucking awesome.pic.twitter.com/q0PFeDP8Il
This is from @anbiondo’s C3 CTF writeup:https://abiondo.me/2019/01/02/exploiting-math-expm1-v8/ …
Underlying bug: Math.expm1 computes (e^x)-1. v8 JIT assumes this will produce either a normal float or NaN. But expm(-0) produces float -0, a case the JIT misses.
That sounds innocuous and in isolation is. But the v8 JIT uses type information for static analysis, which guides the rest of compilation. So: a = http://Object.is (Math.expm(-0), -0) is assumed false by static analysis. But isn’t! The analyzer is wrong.
Define an array of some fixed size. Then index the array with http://Object.is (Math.expm(-0),-0) * INDEX. Analyzer assumes: must be zero, no check needed. At runtime: isn’t zero, is INDEX, check was definitely needed. Boom.
We had a bunch of somewhat similar issues in Rust involving float to int casts. Because overflow during float->int cases is undef, LLVM would remove our array bounds checks for expressions like array[1.79769e+308 as usize]. :(
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.