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feat: enable WASM trap handlers in all Node.js processes (#48983)
fix: enable WASM trap handlers in all Node.js processes ``` Original reason for revert: Some apps started throwing exception on startup https://github.com/electron/electron/issues/48956 ``` We now move the trap handler registeration before any user script execution. Add a fuse to support disabling the feature is application needs to run in memory constrained environments.
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@@ -137,6 +137,33 @@ The extra privileges granted to the `file://` protocol by this fuse are incomple
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* `file://` protocol pages have universal access granted to child frames also running on `file://`
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protocols regardless of sandbox settings
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### `wasmTrapHandlers`
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**Default:** Enabled
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**@electron/fuses:** `FuseV1Options.WasmTrapHandlers`
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The `wasmTrapHandlers` fuse controls whether V8 will use signal handlers to trap Out of Bounds memory
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access from WebAssembly. The feature works by surrounding the WebAssembly memory with large guard regions
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and then installing a signal handler that traps attempt to access memory in the guard region. The feature
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is only supported on the following 64-bit systems.
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Linux. MacOS, Windows - x86_64
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Linux, MacOS - aarch64
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| Guard Pages | WASM heap | Guard Pages |
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|-----8GB-----| |-----8GB-----|
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When the fuse is disabled V8 will use explicit bound checks in the generated WebAssembly code to ensure
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memory safety. However, this method has some downsides
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* The compiler generates extra nodes for each memory reference, leading to longer compile times due to the
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additional processing time needed for these nodes.
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* In turn, these extra nodes lead to lots of extra code being generated, making WebAssembly modules bigger
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than they ideally should be.
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* This extra code, particularly the compare and branch before every memory reference,
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incurs a significant runtime cost.
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## How do I flip fuses?
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### The easy way
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