electron/patches/node/remove_obsolete_noarraybufferzerofillscope.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Robo <hop2deep@gmail.com>
Date: Wed, 21 Jan 2026 09:53:15 +0000
Subject: remove obsolete NoArrayBufferZeroFillScope

Replace the scope in favor of the V8 api added in
https://chromium-review.googlesource.com/c/v8/v8/+/5679067

Ports changes from
1) https://github.com/nodejs/node/commit/869ea331f3a8215229290e2e6038956874c382a6
2) https://github.com/nodejs/node/commit/ef9dc0857a73610f5de5dc9f37afd0a927c4c17f
3) partially from https://github.com/nodejs/node/commit/e0a71517fef4ca83f2d40d2d1600022bc82a7f9f

This is needed to remove dependency on the zero_fill_field_
that is exposed to JS
Refs https://github.com/nodejs/node/commit/3cdb1cd437f63dd256ae2ab3b7e9016257326cb4

diff --git a/src/api/environment.cc b/src/api/environment.cc
index 8a12475857135bd3e904610b7eb887c397c8e73c..3702672f4e2c3b1bff9f9f5c66ca251af447826a 100644
--- a/src/api/environment.cc
+++ b/src/api/environment.cc
@@ -107,11 +107,7 @@ MaybeLocal<Value> PrepareStackTraceCallback(Local<Context> context,
 }
 
 void* NodeArrayBufferAllocator::Allocate(size_t size) {
-  void* ret;
-  if (zero_fill_field_ || per_process::cli_options->zero_fill_all_buffers)
-    ret = allocator_->Allocate(size);
-  else
-    ret = allocator_->AllocateUninitialized(size);
+  void* ret = allocator_->Allocate(size);
   if (ret != nullptr) [[likely]] {
     total_mem_usage_.fetch_add(size, std::memory_order_relaxed);
   }
diff --git a/src/crypto/crypto_cipher.cc b/src/crypto/crypto_cipher.cc
index c00d3616e08b00b1e0a3a29b2dbb5278e1e14fcc..8939c5e5085d00b098f66074b9ee033f5be55d08 100644
--- a/src/crypto/crypto_cipher.cc
+++ b/src/crypto/crypto_cipher.cc
@@ -20,6 +20,7 @@ using ncrypto::SSLPointer;
 using v8::Array;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
@@ -774,10 +775,10 @@ CipherBase::UpdateResult CipherBase::Update(
     return kErrorState;
   }
 
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
-    *out = ArrayBuffer::NewBackingStore(env()->isolate(), buf_len);
-  }
+  *out = ArrayBuffer::NewBackingStore(
+      env()->isolate(),
+      buf_len,
+      BackingStoreInitializationMode::kUninitialized);
 
   buffer = {
       .data = reinterpret_cast<const unsigned char*>(data),
@@ -852,11 +853,10 @@ bool CipherBase::Final(std::unique_ptr<BackingStore>* out) {
 
   const int mode = ctx_.getMode();
 
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
-    *out = ArrayBuffer::NewBackingStore(
-        env()->isolate(), static_cast<size_t>(ctx_.getBlockSize()));
-  }
+  *out = ArrayBuffer::NewBackingStore(
+      env()->isolate(),
+      static_cast<size_t>(ctx_.getBlockSize()),
+      BackingStoreInitializationMode::kUninitialized);
 
   if (kind_ == kDecipher &&
       Cipher::FromCtx(ctx_).isSupportedAuthenticatedMode()) {
@@ -972,10 +972,10 @@ bool PublicKeyCipher::Cipher(
     return false;
   }
 
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    *out = ArrayBuffer::NewBackingStore(env->isolate(), out_len);
-  }
+  *out = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      out_len,
+      BackingStoreInitializationMode::kUninitialized);
 
   if (EVP_PKEY_cipher(
           ctx.get(),
diff --git a/src/crypto/crypto_common.cc b/src/crypto/crypto_common.cc
index b81b9005365272217c77e2b9289bd9f877c0e77c..185b1d8fe657b5db64dc92497ca742d69f7a2764 100644
--- a/src/crypto/crypto_common.cc
+++ b/src/crypto/crypto_common.cc
@@ -37,6 +37,7 @@ using ncrypto::X509Pointer;
 using ncrypto::X509View;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::EscapableHandleScope;
 using v8::Integer;
@@ -307,11 +308,10 @@ MaybeLocal<Object> ECPointToBuffer(Environment* env,
     return MaybeLocal<Object>();
   }
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), len);
-  }
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      len,
+      BackingStoreInitializationMode::kUninitialized);
 
   len = EC_POINT_point2oct(group,
                            point,
diff --git a/src/crypto/crypto_ec.cc b/src/crypto/crypto_ec.cc
index 2a3107dbbf5c0dfe70c2e105338d186e5620ddbf..f36c84a77313bd57d0a7a902d1a2529636ca1422 100644
--- a/src/crypto/crypto_ec.cc
+++ b/src/crypto/crypto_ec.cc
@@ -29,6 +29,7 @@ using ncrypto::MarkPopErrorOnReturn;
 using v8::Array;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
@@ -201,14 +202,10 @@ void ECDH::ComputeSecret(const FunctionCallbackInfo<Value>& args) {
     return;
   }
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    // NOTE: field_size is in bits
-    int field_size = EC_GROUP_get_degree(ecdh->group_);
-    size_t out_len = (field_size + 7) / 8;
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), out_len);
-  }
+  int field_size = EC_GROUP_get_degree(ecdh->group_);
+  size_t out_len = (field_size + 7) / 8;
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(), out_len, BackingStoreInitializationMode::kUninitialized);
 
   if (!ECDH_compute_key(
           bs->Data(), bs->ByteLength(), pub, ecdh->key_.get(), nullptr))
@@ -257,12 +254,10 @@ void ECDH::GetPrivateKey(const FunctionCallbackInfo<Value>& args) {
     return THROW_ERR_CRYPTO_OPERATION_FAILED(env,
         "Failed to get ECDH private key");
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(),
-                                      BignumPointer::GetByteCount(b));
-  }
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      BignumPointer::GetByteCount(b),
+      BackingStoreInitializationMode::kUninitialized);
   CHECK_EQ(bs->ByteLength(),
            BignumPointer::EncodePaddedInto(
                b, static_cast<unsigned char*>(bs->Data()), bs->ByteLength()));
diff --git a/src/crypto/crypto_rsa.cc b/src/crypto/crypto_rsa.cc
index 1f2fccce6ed8f14525557644e0bdd130eedf3337..1099a8f89bb53083f01942ee14fff453d8cdc0af 100644
--- a/src/crypto/crypto_rsa.cc
+++ b/src/crypto/crypto_rsa.cc
@@ -20,6 +20,7 @@ using ncrypto::EVPKeyPointer;
 using ncrypto::RSAPointer;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::FunctionCallbackInfo;
 using v8::Int32;
 using v8::JustVoid;
@@ -535,12 +536,10 @@ Maybe<void> GetRsaKeyDetail(Environment* env,
     return Nothing<void>();
   }
 
-  std::unique_ptr<BackingStore> public_exponent;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    public_exponent = ArrayBuffer::NewBackingStore(
-        env->isolate(), BignumPointer::GetByteCount(e));
-  }
+  auto public_exponent = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      BignumPointer::GetByteCount(e),
+      BackingStoreInitializationMode::kUninitialized);
   CHECK_EQ(BignumPointer::EncodePaddedInto(
                e,
                static_cast<unsigned char*>(public_exponent->Data()),
diff --git a/src/crypto/crypto_sig.cc b/src/crypto/crypto_sig.cc
index 2f6e683e3497d4315259773d09443e5215bff28f..c33e93c34ef32c18e6de6bc03698ed6b851b4aa3 100644
--- a/src/crypto/crypto_sig.cc
+++ b/src/crypto/crypto_sig.cc
@@ -21,6 +21,7 @@ using ncrypto::EVPKeyPointer;
 using ncrypto::EVPMDCtxPointer;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
@@ -92,11 +93,8 @@ std::unique_ptr<BackingStore> Node_SignFinal(Environment* env,
     return nullptr;
 
   size_t sig_len = pkey.size();
-  std::unique_ptr<BackingStore> sig;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    sig = ArrayBuffer::NewBackingStore(env->isolate(), sig_len);
-  }
+  auto sig = ArrayBuffer::NewBackingStore(
+      env->isolate(), sig_len, BackingStoreInitializationMode::kUninitialized);
   EVPKeyCtxPointer pkctx = pkey.newCtx();
   if (pkctx && EVP_PKEY_sign_init(pkctx.get()) > 0 &&
       ApplyRSAOptions(pkey, pkctx.get(), padding, pss_salt_len) &&
@@ -168,11 +166,9 @@ std::unique_ptr<BackingStore> ConvertSignatureToP1363(
   if (n == kNoDsaSignature)
     return std::move(signature);
 
-  std::unique_ptr<BackingStore> buf;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    buf = ArrayBuffer::NewBackingStore(env->isolate(), 2 * n);
-  }
+  auto buf = ArrayBuffer::NewBackingStore(
+      env->isolate(), 2 * n, BackingStoreInitializationMode::kUninitialized);
+
   if (!ExtractP1363(static_cast<unsigned char*>(signature->Data()),
                     static_cast<unsigned char*>(buf->Data()),
                     signature->ByteLength(), n))
diff --git a/src/crypto/crypto_tls.cc b/src/crypto/crypto_tls.cc
index a80685790bd29102d99929ff81f866e0aee370f1..24336b86f6f25533a7b668e9f9806a5635e3a398 100644
--- a/src/crypto/crypto_tls.cc
+++ b/src/crypto/crypto_tls.cc
@@ -46,6 +46,7 @@ using v8::Array;
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::Context;
 using v8::DontDelete;
@@ -1087,10 +1088,10 @@ int TLSWrap::DoWrite(WriteWrap* w,
   // and copying it when it could just be used.
 
   if (nonempty_count != 1) {
-    {
-      NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
-      bs = ArrayBuffer::NewBackingStore(env()->isolate(), length);
-    }
+    bs = ArrayBuffer::NewBackingStore(
+        env()->isolate(),
+        length,
+        BackingStoreInitializationMode::kUninitialized);
     size_t offset = 0;
     for (i = 0; i < count; i++) {
       memcpy(static_cast<char*>(bs->Data()) + offset,
@@ -1107,8 +1108,10 @@ int TLSWrap::DoWrite(WriteWrap* w,
     written = SSL_write(ssl_.get(), buf->base, buf->len);
 
     if (written == -1) {
-      NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
-      bs = ArrayBuffer::NewBackingStore(env()->isolate(), length);
+      bs = ArrayBuffer::NewBackingStore(
+          env()->isolate(),
+          length,
+          BackingStoreInitializationMode::kUninitialized);
       memcpy(bs->Data(), buf->base, buf->len);
     }
   }
@@ -1746,11 +1749,8 @@ void TLSWrap::GetFinished(const FunctionCallbackInfo<Value>& args) {
   if (len == 0)
     return;
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), len);
-  }
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(), len, BackingStoreInitializationMode::kUninitialized);
 
   CHECK_EQ(bs->ByteLength(),
            SSL_get_finished(w->ssl_.get(), bs->Data(), bs->ByteLength()));
@@ -1777,11 +1777,8 @@ void TLSWrap::GetPeerFinished(const FunctionCallbackInfo<Value>& args) {
   if (len == 0)
     return;
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), len);
-  }
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(), len, BackingStoreInitializationMode::kUninitialized);
 
   CHECK_EQ(bs->ByteLength(),
            SSL_get_peer_finished(w->ssl_.get(), bs->Data(), bs->ByteLength()));
@@ -1806,11 +1803,8 @@ void TLSWrap::GetSession(const FunctionCallbackInfo<Value>& args) {
   if (slen <= 0)
     return;  // Invalid or malformed session.
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), slen);
-  }
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(), slen, BackingStoreInitializationMode::kUninitialized);
 
   unsigned char* p = static_cast<unsigned char*>(bs->Data());
   CHECK_LT(0, i2d_SSL_SESSION(sess, &p));
@@ -1993,11 +1987,8 @@ void TLSWrap::ExportKeyingMaterial(const FunctionCallbackInfo<Value>& args) {
   uint32_t olen = args[0].As<Uint32>()->Value();
   Utf8Value label(env->isolate(), args[1]);
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), olen);
-  }
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(), olen, BackingStoreInitializationMode::kUninitialized);
 
   ByteSource context;
   bool use_context = !args[2]->IsUndefined();
diff --git a/src/crypto/crypto_x509.cc b/src/crypto/crypto_x509.cc
index fd29d17de195017970856ce30d7a9c5785b0b8ee..7fe3d09851d4476fa3f77ea0a0b49e8af13fae4f 100644
--- a/src/crypto/crypto_x509.cc
+++ b/src/crypto/crypto_x509.cc
@@ -28,6 +28,7 @@ using v8::Array;
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::Context;
 using v8::Date;
@@ -683,11 +684,8 @@ MaybeLocal<Object> GetPubKey(Environment* env, OSSL3_CONST RSA* rsa) {
   int size = i2d_RSA_PUBKEY(rsa, nullptr);
   CHECK_GE(size, 0);
 
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), size);
-  }
+  auto bs = ArrayBuffer::NewBackingStore(
+      env->isolate(), size, BackingStoreInitializationMode::kUninitialized);
 
   unsigned char* serialized = reinterpret_cast<unsigned char*>(bs->Data());
   CHECK_GE(i2d_RSA_PUBKEY(rsa, &serialized), 0);
diff --git a/src/encoding_binding.cc b/src/encoding_binding.cc
index 5ace688bb7ffc86eedf5aff11ab0ab487ad9440e..31058543a164bb45ba989e8c433994e0857a98b9 100644
--- a/src/encoding_binding.cc
+++ b/src/encoding_binding.cc
@@ -15,6 +15,7 @@ namespace encoding_binding {
 
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::FunctionCallbackInfo;
 using v8::Isolate;
@@ -123,9 +124,8 @@ void BindingData::EncodeUtf8String(const FunctionCallbackInfo<Value>& args) {
 
   Local<ArrayBuffer> ab;
   {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    std::unique_ptr<BackingStore> bs =
-        ArrayBuffer::NewBackingStore(isolate, length);
+    std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+        isolate, length, BackingStoreInitializationMode::kUninitialized);
 
     CHECK(bs);
 
diff --git a/src/env-inl.h b/src/env-inl.h
index 98e1e1e75bae94038bba0049447ab48b0acfb8cc..fe395bf89f9c1e5bb2dabc8fceda7b9b2b877415 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -44,16 +44,6 @@
 
 namespace node {
 
-NoArrayBufferZeroFillScope::NoArrayBufferZeroFillScope(
-    IsolateData* isolate_data)
-    : node_allocator_(isolate_data->node_allocator()) {
-  if (node_allocator_ != nullptr) node_allocator_->zero_fill_field()[0] = 0;
-}
-
-NoArrayBufferZeroFillScope::~NoArrayBufferZeroFillScope() {
-  if (node_allocator_ != nullptr) node_allocator_->zero_fill_field()[0] = 1;
-}
-
 inline v8::Isolate* IsolateData::isolate() const {
   return isolate_;
 }
diff --git a/src/env.cc b/src/env.cc
index 161d577e0ea6a251c83ba1903b1ec9a582a5317c..52713421465c23c959afac1955168294b2048341 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -39,6 +39,9 @@ namespace node {
 
 using errors::TryCatchScope;
 using v8::Array;
+using v8::ArrayBuffer;
+using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::Context;
 using v8::CppHeap;
@@ -724,9 +727,10 @@ void Environment::add_refs(int64_t diff) {
 }
 
 uv_buf_t Environment::allocate_managed_buffer(const size_t suggested_size) {
-  NoArrayBufferZeroFillScope no_zero_fill_scope(isolate_data());
-  std::unique_ptr<v8::BackingStore> bs =
-      v8::ArrayBuffer::NewBackingStore(isolate(), suggested_size);
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      isolate(),
+      suggested_size,
+      BackingStoreInitializationMode::kUninitialized);
   uv_buf_t buf = uv_buf_init(static_cast<char*>(bs->Data()), bs->ByteLength());
   released_allocated_buffers_.emplace(buf.base, std::move(bs));
   return buf;
diff --git a/src/env.h b/src/env.h
index c346e3a9c827993036438685d758a734f9ce8c05..28c8df87c8e2f06e2ed8c554260bfdedb860bb4a 100644
--- a/src/env.h
+++ b/src/env.h
@@ -114,19 +114,6 @@ class ModuleWrap;
 class Environment;
 class Realm;
 
-// Disables zero-filling for ArrayBuffer allocations in this scope. This is
-// similar to how we implement Buffer.allocUnsafe() in JS land.
-class NoArrayBufferZeroFillScope {
- public:
-  inline explicit NoArrayBufferZeroFillScope(IsolateData* isolate_data);
-  inline ~NoArrayBufferZeroFillScope();
-
- private:
-  NodeArrayBufferAllocator* node_allocator_;
-
-  friend class Environment;
-};
-
 struct IsolateDataSerializeInfo {
   std::vector<SnapshotIndex> primitive_values;
   std::vector<PropInfo> template_values;
diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index e844fe6cb33acefd075516e675075421ad5c3cff..06c84eb6ec097e3cb39502116135a7802aed13ce 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -66,6 +66,7 @@ namespace Buffer {
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::EscapableHandleScope;
 using v8::FunctionCallbackInfo;
@@ -376,9 +377,8 @@ MaybeLocal<Object> New(Environment* env, size_t length) {
 
   Local<ArrayBuffer> ab;
   {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    std::unique_ptr<BackingStore> bs =
-        ArrayBuffer::NewBackingStore(isolate, length);
+    std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+        isolate, length, BackingStoreInitializationMode::kUninitialized);
 
     CHECK(bs);
 
@@ -417,18 +417,14 @@ MaybeLocal<Object> Copy(Environment* env, const char* data, size_t length) {
     return Local<Object>();
   }
 
-  Local<ArrayBuffer> ab;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    std::unique_ptr<BackingStore> bs =
-        ArrayBuffer::NewBackingStore(isolate, length);
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      isolate, length, BackingStoreInitializationMode::kUninitialized);
 
-    CHECK(bs);
+  CHECK(bs);
 
-    memcpy(bs->Data(), data, length);
+  memcpy(bs->Data(), data, length);
 
-    ab = ArrayBuffer::New(isolate, std::move(bs));
-  }
+  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, std::move(bs));
 
   MaybeLocal<Object> obj =
       New(env, ab, 0, ab->ByteLength())
@@ -1440,14 +1436,16 @@ void CreateUnsafeArrayBuffer(const FunctionCallbackInfo<Value>& args) {
 
   Local<ArrayBuffer> buf;
 
-  NodeArrayBufferAllocator* allocator = env->isolate_data()->node_allocator();
   // 0-length, or zero-fill flag is set, or building snapshot
   if (size == 0 || per_process::cli_options->zero_fill_all_buffers ||
-      allocator == nullptr) {
+      env->isolate_data()->is_building_snapshot()) {
     buf = ArrayBuffer::New(isolate, size);
   } else {
-    std::unique_ptr<BackingStore> store =
-        ArrayBuffer::NewBackingStore(isolate, size);
+    std::unique_ptr<BackingStore> store = ArrayBuffer::NewBackingStore(
+        isolate,
+        size,
+        BackingStoreInitializationMode::kUninitialized,
+        v8::BackingStoreOnFailureMode::kReturnNull);
     if (!store) {
       return env->ThrowRangeError("Array buffer allocation failed");
     }
diff --git a/src/node_http2.cc b/src/node_http2.cc
index 8237c9b7d325dd925ae8798d7795fcd94eeb13d0..a22cf6c4e33e5cf2d3168ce03dc35af8a9584af7 100644
--- a/src/node_http2.cc
+++ b/src/node_http2.cc
@@ -27,6 +27,7 @@ using v8::Array;
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::Context;
 using v8::EscapableHandleScope;
@@ -298,11 +299,10 @@ Local<Value> Http2Settings::Pack(
     size_t count,
     const nghttp2_settings_entry* entries) {
   EscapableHandleScope scope(env->isolate());
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), count * 6);
-  }
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      count * 6,
+      BackingStoreInitializationMode::kUninitialized);
   if (nghttp2_pack_settings_payload(static_cast<uint8_t*>(bs->Data()),
                                     bs->ByteLength(),
                                     entries,
@@ -468,13 +468,11 @@ Origins::Origins(
     return;
   }
 
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs_ = ArrayBuffer::NewBackingStore(env->isolate(),
-                                       alignof(nghttp2_origin_entry) - 1 +
-                                       count_ * sizeof(nghttp2_origin_entry) +
-                                       origin_string_len);
-  }
+  bs_ = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      alignof(nghttp2_origin_entry) - 1 +
+          count_ * sizeof(nghttp2_origin_entry) + origin_string_len,
+      BackingStoreInitializationMode::kUninitialized);
 
   // Make sure the start address is aligned appropriately for an nghttp2_nv*.
   char* start = nbytes::AlignUp(static_cast<char*>(bs_->Data()),
@@ -2120,12 +2118,10 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
     // happen, we concatenate the data we received with the already-stored
     // pending input data, slicing off the already processed part.
     size_t pending_len = stream_buf_.len - stream_buf_offset_;
-    std::unique_ptr<BackingStore> new_bs;
-    {
-      NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
-      new_bs = ArrayBuffer::NewBackingStore(env()->isolate(),
-                                            pending_len + nread);
-    }
+    std::unique_ptr<BackingStore> new_bs = ArrayBuffer::NewBackingStore(
+        env()->isolate(),
+        pending_len + nread,
+        BackingStoreInitializationMode::kUninitialized);
     memcpy(static_cast<char*>(new_bs->Data()),
            stream_buf_.base + stream_buf_offset_,
            pending_len);
diff --git a/src/node_internals.h b/src/node_internals.h
index 12ea72b61b0a5e194207bb369dfed4b8667107cb..18844e18a32d6b07e62481138fa2342765643484 100644
--- a/src/node_internals.h
+++ b/src/node_internals.h
@@ -121,8 +121,6 @@ v8::MaybeLocal<v8::Object> InitializePrivateSymbols(
 
 class NodeArrayBufferAllocator : public ArrayBufferAllocator {
  public:
-  inline uint32_t* zero_fill_field() { return &zero_fill_field_; }
-
   void* Allocate(size_t size) override;  // Defined in src/node.cc
   void* AllocateUninitialized(size_t size) override;
   void Free(void* data, size_t size) override;
@@ -139,7 +137,6 @@ class NodeArrayBufferAllocator : public ArrayBufferAllocator {
   }
 
  private:
-  uint32_t zero_fill_field_ = 1;  // Boolean but exposed as uint32 to JS land.
   std::atomic<size_t> total_mem_usage_ {0};
 
   // Delegate to V8's allocator for compatibility with the V8 memory cage.
diff --git a/src/stream_base.cc b/src/stream_base.cc
index fc81108120f0066f2d5dabedc74e22cb6c84d8e4..0bf2642599ee91e2d2aa20d6d066c80b3026ecc5 100644
--- a/src/stream_base.cc
+++ b/src/stream_base.cc
@@ -19,6 +19,7 @@ namespace node {
 using v8::Array;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::ConstructorBehavior;
 using v8::Context;
 using v8::DontDelete;
@@ -243,8 +244,8 @@ int StreamBase::Writev(const FunctionCallbackInfo<Value>& args) {
 
   std::unique_ptr<BackingStore> bs;
   if (storage_size > 0) {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(isolate, storage_size);
+    bs = ArrayBuffer::NewBackingStore(
+        isolate, storage_size, BackingStoreInitializationMode::kUninitialized);
   }
 
   offset = 0;
@@ -398,14 +399,14 @@ int StreamBase::WriteString(const FunctionCallbackInfo<Value>& args) {
 
   if (try_write) {
     // Copy partial data
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(isolate, buf.len);
+    bs = ArrayBuffer::NewBackingStore(
+        isolate, buf.len, BackingStoreInitializationMode::kUninitialized);
     memcpy(bs->Data(), buf.base, buf.len);
     data_size = buf.len;
   } else {
     // Write it
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(isolate, storage_size);
+    bs = ArrayBuffer::NewBackingStore(
+        isolate, storage_size, BackingStoreInitializationMode::kUninitialized);
     data_size = StringBytes::Write(isolate,
                                    static_cast<char*>(bs->Data()),
                                    storage_size,