misc/wasm/wasm_exec.js           |  7 +++++++
 src/cmd/link/internal/ld/data.go | 11 ++++++++++-

diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 82041e6bb901bde57c43e689984e60a499573aca..a0a264278b1b1d2a7e7232d111a3009241a01f77 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -564,6 +564,13 @@ 				this.mem.setUint32(offset + 4, 0, true);
 				offset += 8;
 			});
 
+			// The linker guarantees global data starts from at least wasmMinDataAddr.
+			// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
+			const wasmMinDataAddr = 4096 + 4096;
+			if (offset >= wasmMinDataAddr) {
+				throw new Error("command line too long");
+			}
+
 			this._inst.exports.run(argc, argv);
 			if (this.exited) {
 				this._resolveExitPromise();
diff --git a/src/cmd/link/internal/ld/data.go b/src/cmd/link/internal/ld/data.go
index 52035e96301cf4639ede631b6ce4d4a2f907108f..54a1d188cdb955d8e35c3d9ce009424e7cd4907a 100644
--- a/src/cmd/link/internal/ld/data.go
+++ b/src/cmd/link/internal/ld/data.go
@@ -2330,6 +2330,11 @@
 	return sect, n, va
 }
 
+// On Wasm, we reserve 4096 bytes for zero page, then 4096 bytes for wasm_exec.js
+// to store command line args. Data sections starts from at least address 8192.
+// Keep in sync with wasm_exec.js.
+const wasmMinDataAddr = 4096 + 4096
+
 // address assigns virtual addresses to all segments and sections and
 // returns all segments in file order.
 func (ctxt *Link) address() []*sym.Segment {
@@ -2339,10 +2344,14 @@ 	va := uint64(*FlagTextAddr)
 	order = append(order, &Segtext)
 	Segtext.Rwx = 05
 	Segtext.Vaddr = va
-	for _, s := range Segtext.Sections {
+	for i, s := range Segtext.Sections {
 		va = uint64(Rnd(int64(va), int64(s.Align)))
 		s.Vaddr = va
 		va += s.Length
+
+		if ctxt.IsWasm() && i == 0 && va < wasmMinDataAddr {
+			va = wasmMinDataAddr
+		}
 	}
 
 	Segtext.Length = va - uint64(*FlagTextAddr)