Wednesday, October 30, 2013

Unintended Acceleration, Software, and Sadness

A few years ago I became concerned about reports of sudden unintended acceleration in Toyota vehicles, especially when some of my family members started driving new Toyotas. At first I was skeptical of the reports, but they kept coming. In time, a friend of a friend had a terrible accident, and I was only two trustworthy people removed from a firsthand experience.

I started paying more attention to the reports, and I developed a very strong suspicion that software was to blame. Three simple facts led me to this suspicion:

  1. The engine throttle was controlled by software.
  2. The brakes were controlled by software.
  3. Nobody knows how to make software without bugs.

The first fact surprised me a little. The second surprised me a lot. The third is common knowledge to anyone who has ever developed software, but it may be surprising to those who haven't.

When I first learned how to program in BASIC as a child, I was taught that computers don't make errors; people do. If you write a perfect program, the computer will do exactly what you expect. This is a tantalizingly optimistic view, and it helped me challenge myself to become a better programmer. Unfortunately it is not true.

During those early years my programs were small and simple. Sometimes I could write an entire program in a single page of text. It seemed very possible that programs could be perfectly correct, but somehow they never were. There was always a bug, and almost every time the bug was my own fault. As time went on, I started working on larger and larger software projects, and it became clear to me, as it should to any software developer, that the likelihood of bugs increases when software complexity increases.

This is a Big Problem. It is so big that many of the greatest minds in computer science have devoted their lives to it. Some very interesting progress has been made, but it is still largely an unsolved problem in real-world systems. It is hard to create a program that correctly implements a specification. It is hard to create a correct specification. It is hard to implement a programming language correctly. It is hard to build correct interfaces to other programs. It is hard to build computers that reliably execute programs correctly, especially in environments with high levels of electrical noise like the engine compartment of a car.

By the way, I often use "is hard" to mean "might be impossible".

Not all software is equally buggy, of course. It is possible to create computer systems that are more reliable than others (consider the hardware and software on spacecraft, for example), but it is difficult to do. It is a very different problem than the problem of building reliable mechanical systems.

The problem of software bugs is probably the biggest reason that computer security is so awful. We don't know how to make software without bugs, and bugs tend to undermine security. This is why people in the information security community seem to understand and expect bugs more than most other people; we spend our lives discovering, analyzing, exploiting, and fixing bugs. We find bugs that others miss. We break things that are supposedly unbreakable.

To me, the unintended acceleration reports smelled like buggy software from the very beginning. Few of the reports were identical, but all of them involved the inability of the driver to influence a computer that controls the engine throttle.

Some of the reports agreed on a particular point: Pressing harder on the brake pedal did nothing. This is terrifying to imagine. Your car accelerates rapidly even while your foot is on the brake pedal. You press harder and harder until the pedal is at the floor. Maybe you have time to switch off the ignition or shift into neutral, but how long would it take you to think of that? It might take only a second of unintended acceleration to cause a fatal accident.

At first Toyota denied the problem. Then they recalled floor mats. At the time, I thought that was a pretty stupid response to what seemed like a software bug. Then they recalled pedals. Then they blamed the drivers. They repeatedly said that they couldn't recreate the problem when testing the software (but any software developer knows that an inability to reproduce an error rarely means that a bug doesn't exist).

I started wondering: Have any information security professionals audited the software? Has anyone actually skilled at finding bugs looked for bugs? As far as I could determine, the only people who had tested the software were automotive engineers employed by Toyota. Automotive engineers might not know anything about finding bugs, but they should at least know something about fail-safe design.

To me, the most troubling part of the whole thing was that the brakes and all fail-safe mechanisms were also under computer control. Really? You would make a car with software throttle and also give it software brakes? Don't you know that an automobile is a lethal weapon? Have you never seen software fail? How about a traditional brake system just in case, even if it is only activated when the brake pedal is fully depressed? How about a mechanical linkage that limits the throttle when the driver slams on the brakes?

I can't imagine any engineering culture within Toyota that would fail to consider such things unless it is simply a case of automotive engineers putting too much trust in software because they don't understand software failures. Maybe they tested the things ten thousand times, unaware that they should have tested ten trillion different conditions.

As I became more and more convinced that a software bug was to blame and that nobody was properly looking for it, I started planning a blog post. I considered trying to reverse engineer a car. Even better, perhaps I could convince someone more skilled than me to try to find the bug.

Then the unexpected happened: Tin whiskers were implicated as a cause of unintended acceleration in Toyota vehicles. I had convinced myself that software must be to blame, but suddenly a seemingly plausible alternative arose. I understood tin whiskers well enough to believe that they could explain at least a portion of the failures, yet tin whiskers were just mysterious enough that I didn't question whether or not they might explain all of the failures.

Then I failed. I stopped paying attention after I heard about the tin whiskers. I didn't consider the likelihood of software bugs vs. failures due to tin whiskers. I didn't follow through on making recommendations for mechanical fail-safe (which could prevent fatal accidents regardless of the root cause of the problem). I didn't notice when Toyota denied that tin whiskers caused unintended acceleration. I never went back and reviewed the notably weak software analysis results of the NASA report that first implicated tin whiskers. I ignored the fact that the United States government stopped investigating the problem.

This week I read that a court of law found Toyota's faulty software to blame in a case of unintended acceleration. A software audit for the plaintiff revealed that coding standards for safety-critical software were not followed and that the software is buggy and incredibly complex. The audit even identified a particular failure mode in which a driver could press harder on the brake pedal with no effect, which is as close to a "smoking gun" as we could hope to see. The case clearly indicates negligent software development and deployment practices on the part of Toyota.

This shouldn't have happened if the automotive engineers were appropriately skeptical of software. This shouldn't have happened if the executives were appropriately skeptical of software. This shouldn't have happened if the software engineers were appropriately skeptical of software.

At the very least, the software engineers should have known better. If I were developing software that could kill someone in an error condition, I would feel a moral obligation to tell people about the potential for error. However, as everyone in the information security community knows, developers tend to overestimate the quality of their own code, and very few software developers are skilled bug hunters.

Unfortunately the software source code still has not been made available to the public. We have to trust the analysis of the plaintiff's expert witness (or trust Toyota) to understand how the software works. The details from the expert witness that have been reported, however, seem very credible to me. The jury found in favor of the plaintiff, so Toyota failed to effectively argue against the analysis.

I'm pretty confident in agreeing with the analysis, but it would be nice to be able to verify. If the software were open source, that would be possible. In fact, if the software were open source, others could have done the same analysis years ago and likely would have been able to fix bugs and save lives. How many people will have to die before we decide that open source is as important for safety as seat belts?

I am deeply sad for the people who died in automobile accidents for years before Toyota's negligence was revealed, I am sad for the people who will die in future accidents, and I am sad and ashamed that I never followed through on my own suspicions about the bugs at the heart of the problem.


Redbeard said...

My favorite bit about this from the past:

“The jury is back, The verdict is in. There is no electronic-based cause for unintended high-speed acceleration in Toyotas. Period.” - Ray LaHood, United States Secretary of Transportation

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Assuming the accelerator and brake systems run on CPUs built on something like 1 square centimeter of silicon, in aggregate Toyotas could represent one of the world's larger cosmic ray detectors.

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Robert Graham said...

The number one cause of unintended accelerator is because drivers panic and press the gas pedal instead of the break. It's a constant across all manufacturers and all models. It's not even clear that the problem was statistically more prevalent in Toyotas.

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Raymond said...

This is quite unfortunate. You're right about the idea of creating bug-free programs, moreso on complex ones, is next to impossible. You'd imagine they would have tested the software, then did a thorough test drive and analysis, before putting it on the market. Several layers of testing, both in the software and the hardware side of things, could've helped in avoiding issues like this. Thanks for pointing these out!

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The engine throttle was controlled by software. - yes indeed it's kinda scary, manual driving is more safe than this.

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