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8264827: Large mapped buffer/segment crash the VM when calling isLoaded

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Reviewed-by: alanb, mcimadamore
This commit is contained in:
Chris Hegarty 2021-04-12 11:21:34 +00:00
parent e604320bbd
commit 3c9858ddfb
5 changed files with 36 additions and 13 deletions
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8
src/java.base/share/classes/java/nio/MappedMemoryUtils.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -61,10 +61,10 @@ import java.io.UncheckedIOException;
// considering the loop as dead code.
Unsafe unsafe = Unsafe.getUnsafe();
int ps = Bits.pageSize();
int count = Bits.pageCount(length);
long count = Bits.pageCount(length);
long a = mappingAddress(address, offset);
byte x = 0;
for (int i=0; i<count; i++) {
for (long i=0; i<count; i++) {
// TODO consider changing to getByteOpaque thus avoiding
// dead code elimination and the need to calculate a checksum
x ^= unsafe.getByte(a);
@ -106,7 +106,7 @@ import java.io.UncheckedIOException;
// native methods
private static native boolean isLoaded0(long address, long length, int pageCount);
private static native boolean isLoaded0(long address, long length, long pageCount);
private static native void load0(long address, long length);
private static native void unload0(long address, long length);
private static native void force0(FileDescriptor fd, long address, long length) throws IOException;