Fix missing export of malloc for newer versions of Emscripten.

Work around issue with TSAN and newer kernels.

Update actions/checkout to v4.

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
   linux:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update
@@ -22,7 +22,7 @@ jobs:
   linux-asan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update
@@ -36,7 +36,7 @@ jobs:
   linux-msan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update
@@ -50,21 +50,23 @@ jobs:
   linux-tsan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update
           sudo apt-get install g++ scons
       - name: Build
         run: ./build arch=x64 sanitize=thread
+      - name: Reduce ASLR - https://github.com/google/sanitizers/issues/1716
+        run: sudo sysctl vm.mmap_rnd_bits=28
       - name: Test
         run: ./out/ReleaseTSanX64/primordialsoup out/snapshots/TestRunner.vfuel
         env:
           TSAN_OPTIONS: halt_on_error=1
   linux-ubsan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update
@@ -78,7 +80,7 @@ jobs:
   macos:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: HOMEBREW_NO_AUTO_UPDATE=1 brew install scons
       - name: Build
@@ -88,7 +90,7 @@ jobs:
   windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: pip install scons
       - name: Build
@@ -100,7 +102,7 @@ jobs:
   android:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update
@@ -110,7 +112,7 @@ jobs:
   web:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get update

SConstruct

@@ -182,7 +182,7 @@ def BuildVM(cxx, arch, target_os, debug, sanitize):
     env['LINKFLAGS'] += [
       '-s', 'ALLOW_MEMORY_GROWTH=1',
       '-s', 'ENVIRONMENT=web',
-      '-s', 'EXPORTED_FUNCTIONS=["_load_snapshot", "_handle_message", "_handle_signal", "_free"]',
+      '-s', 'EXPORTED_FUNCTIONS=["_load_snapshot", "_handle_message", "_handle_signal", "_malloc", "_free"]',
       '-s', 'FILESYSTEM=0',
       '-s', 'MALLOC=emmalloc',
       '-s', 'TOTAL_STACK=131072',