Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/src/runtime/memmove_linux_amd64_test.go b/src/runtime/memmove_linux_amd64_test.go
new file mode 100644
index 0000000..5f90062
--- /dev/null
+++ b/src/runtime/memmove_linux_amd64_test.go
@@ -0,0 +1,56 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime_test
+
+import (
+	"os"
+	"syscall"
+	"testing"
+	"unsafe"
+)
+
+// TestMemmoveOverflow maps 3GB of memory and calls memmove on
+// the corresponding slice.
+func TestMemmoveOverflow(t *testing.T) {
+	t.Parallel()
+	// Create a temporary file.
+	tmp, err := os.CreateTemp("", "go-memmovetest")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = tmp.Write(make([]byte, 65536))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(tmp.Name())
+	defer tmp.Close()
+
+	// Set up mappings.
+	base, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
+		0xa0<<32, 3<<30, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_PRIVATE|syscall.MAP_ANONYMOUS, ^uintptr(0), 0)
+	if errno != 0 {
+		t.Skipf("could not create memory mapping: %s", errno)
+	}
+	syscall.Syscall(syscall.SYS_MUNMAP, base, 3<<30, 0)
+
+	for off := uintptr(0); off < 3<<30; off += 65536 {
+		_, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
+			base+off, 65536, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FIXED, tmp.Fd(), 0)
+		if errno != 0 {
+			t.Skipf("could not map a page at requested 0x%x: %s", base+off, errno)
+		}
+		defer syscall.Syscall(syscall.SYS_MUNMAP, base+off, 65536, 0)
+	}
+
+	s := unsafe.Slice((*byte)(unsafe.Pointer(base)), 3<<30)
+	n := copy(s[1:], s)
+	if n != 3<<30-1 {
+		t.Fatalf("copied %d bytes, expected %d", n, 3<<30-1)
+	}
+	n = copy(s, s[1:])
+	if n != 3<<30-1 {
+		t.Fatalf("copied %d bytes, expected %d", n, 3<<30-1)
+	}
+}