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Thanks to for the link.
Cars are complicated beasts. It used to be that everything was mechanical, but that is no longer the case. When you press down on the accelerator, it doesn't immediately open the throttle by pulling a wire (ah, the good ol' days). It is now linked via a piece of software. In this instance, the code that was between you pressing the peddle and the car accelerating wasn't just bad... it was REALLY bad. After rogue accelerations, the Barr Group did an assessment of the code. From the article:
The examination of the software that controlled the throttle found that it was of very poor quality. There were more than 11,000 global variables in use; most of the functions were very long and complex; and the code's cyclomatic complexity was much greater than 50. In fact the throttle angle function scored over 100, which puts it in the unmaintainable class.
No single flaw was found that could be conclusively blamed for the UA - but there were many that could have caused the problem. In particular, the way that the stack was used could have resulted in an overflow that wiped out essential OS data.
Not only was stack usage up to 94% in normal operation, the code was recursive! Recursive code is generally avoided in embedded application because it is harder to demonstrate that it has a good chance of working reliably. MISRA - the Motor Industry Software Reliability Association - has a rule that explicitly forbids recursion. Toyota claimed it followed MISRA standards but more than 80,000 violations were found.
Via the CSMonitor in 2010 (http://is.gd/2I880B), we find that Toyota isn't the only manufacturer with rogue acceleration. Looking back, all of the larger vehicle manufactures had at least 50 complaints about unintended acceleration. Before 2010, Nissan had the lowest number of complaints (50) and Ford had the highest (339). Chrysler, General Motors, and Honda were sitting between those two with 156, 134, and 89, respectively.
Admittedly, some of those probably have nothing to do with the software, but we don't really know. Safety Critical Software needs to be put together correctly. If non-software companies are putting software in their products (and who isn't, these days), they should have controls like any other software company would.
If you have code in your product, you are a software company. It's time you acted like one.
This is just appallingly amateurish.
This is great for banking sites, as well as any static sites that you want to avoid caching.
#GoogleChrome #incognito #extension
- Retired2001 - present
- Grumman Data Systems (CallData)Tech Support, 1977 - 1980
- AT&TOperating system developer, 1980 - 1995
- AT&T Bell LabsWAN Networking developer, 1995 - 1997
- AT&T LabsWAN Networking developer, 1997 - 2001
- Brooklyn College, CUNYB.S., Computer Science
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