CODEWITHSUNDEEP
google-chromeencodinggpu
Tony
Tony

Reputation: 6158

Strange `gpu-preferences` of Chrome

When execute ps -ef on my machine, I found a very strange/special command line parameter of chrome:

501   536   493   0 二11上午 ??       13:11.48 /Applications/Google Chrome.app/Contents/Versions/69.0.3497.100/Google Chrome Helper.app/Contents/MacOS/Google Chrome Helper --type=gpu-process --field-trial-handle=3535656472344341962,3817030915272013891,131072 --gpu-preferences=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 --service-request-channel-token=17030867567105907743

enter image description here

For curiosity, I find the source of chromium, which seems very normal:

namespace gl {
// On dual-GPU systems, expresses a preference for using the integrated
// or discrete GPU. On systems that have dual-GPU support (see
// GpuDataManagerImpl), resource sharing only works between
// contexts that are created with the same GPU preference.
//
// This API will likely need to be adjusted as the functionality is
// implemented on more operating systems.
enum GpuPreference {
  GpuPreferenceNone,
  PreferIntegratedGpu,
  PreferDiscreteGpu,
  GpuPreferenceLast = PreferDiscreteGpu
};
}  // namespace gl

So, is this parameter (KAAAA....) is obscured or some encoding of GPU name? Why such a strange encoding?

Upvotes: 16

Views: 8413

Answers (1)

Josh Lee
Josh Lee

Reputation: 177755

Any time you see an encoding with lots of AAAA in it, you can bet that it's a Base64 encoding of a binary with lots of nulls in it.

>>> a=b'KAAAAAAAAAQAAAAAAAAAAAGAAAAAAAAAAAAAIAAAAAAAAADgBAAAmAAAAM=='
>>> base64.b64decode(a).hex()
'2800000000000004000000000000000001800000000000000000002000000000000000e004000098000000'

(And speaking more generally, any encoding that uses both upper- and lowercase letters is quite likely Base64. For example, a SHA256 is often given in Base64 compared to hexadecimal for SHA1.)

This corresponds to this interface: https://cs.chromium.org/chromium/src/gpu/ipc/common/gpu_preferences.mojom

The wire format does not seem to be very heavily documented, so if you want to interpret this value you might be best off checking out the chromium tree and building the bindings generator. https://chromium.googlesource.com/chromium/src/+/master/mojo/public/tools/bindings/README.md

Upvotes: 19

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