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[wasm] Automate patching the emsdk installation to add controlled indeterminism. (#75532)
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3 changed files with 47 additions and 7 deletions
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@ -83,14 +83,10 @@ and change the
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This will hopefully cause the failure to happen reliably.
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There is another random number generator in `upstream/emscripten/src/deterministic.js`
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which needs the same treatment:
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```
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var randomBuffer3 = new Uint8Array(2);
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crypto.getRandomValues(randomBuffer3);
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which needs the same treatment.
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var MAGIC = (randomBuffer3 [0] << 8) | randomBuffer3 [1];
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console.log ("SEED2: " + MAGIC);
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```
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Running `make patch-deterministic` in `src/mono/wasm` will patch the
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emscripten installation in `src/mono/wasm/emsdk` with these changes.
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# Debugging signature mismatch errors
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@ -140,3 +140,6 @@ build-dbg-proxy:
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$(DOTNET) build $(TOP)/src/mono/wasm/debugger/BrowserDebugHost $(MSBUILD_ARGS)
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build-dbg-testsuite:
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$(DOTNET) build $(TOP)/src/mono/wasm/debugger/DebuggerTestSuite $(MSBUILD_ARGS)
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patch-deterministic:
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cd emsdk/upstream/emscripten/ && patch -p1 < ../../../runtime/deterministic.diff
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41
src/mono/wasm/runtime/deterministic.diff
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41
src/mono/wasm/runtime/deterministic.diff
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@ -0,0 +1,41 @@
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diff --git a/src/deterministic.js b/src/deterministic.js
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index 0b894b4ac..05f50abba 100644
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--- a/src/deterministic.js
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+++ b/src/deterministic.js
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@@ -4,7 +4,13 @@
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* SPDX-License-Identifier: MIT
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*/
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-var MAGIC = 0;
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+var randomBuffer3 = new Uint8Array(2);
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+crypto.getRandomValues(randomBuffer3);
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+
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+var MAGIC = (randomBuffer3 [0] << 8) | randomBuffer3 [1];
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+console.log ("SEED2: " + MAGIC);
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+
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+//var MAGIC = 0;
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Math.random = () => {
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MAGIC = Math.pow(MAGIC + 1.8912, 3) % 1;
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return MAGIC;
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diff --git a/src/library.js b/src/library.js
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index 603f94dbf..698e9fe29 100644
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--- a/src/library.js
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+++ b/src/library.js
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@@ -2196,6 +2196,17 @@ mergeInto(LibraryManager.library, {
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// TODO: consider allowing the API to get a parameter for the number of
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// bytes.
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$getRandomDevice: function() {
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+ var randomBuffer2 = new Uint8Array(2);
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+ crypto.getRandomValues(randomBuffer2);
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+
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+ if (FS.seed2 == null)
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+ FS.seed2 = (randomBuffer2 [0] << 8) | randomBuffer2 [1];
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+ console.log('SEED: ' + FS.seed2);
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+ return function() {
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+ FS.seed2 = FS.seed2 * 16807 % 2147483647;
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+ return FS.seed2;
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+ };
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+
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if (typeof crypto == 'object' && typeof crypto['getRandomValues'] == 'function') {
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// for modern web browsers
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var randomBuffer = new Uint8Array(1);
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