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8236582: (fc) FileChannel.map fails with InternalError when security manager enabled

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2020-01-08 08:35:33 -08:00
parent 257a1bb854
commit 31b9bbd87b
2 changed files with 48 additions and 2 deletions
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8
src/java.base/share/classes/jdk/internal/misc/ExtendedMapMode.java
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@ -27,8 +27,11 @@ package jdk.internal.misc;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.invoke.MethodType;
import java.nio.channels.FileChannel.MapMode;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
/**
* JDK-specific map modes implemented in java.base.
@ -36,10 +39,11 @@ import java.nio.channels.FileChannel.MapMode;
public class ExtendedMapMode {
static final MethodHandle MAP_MODE_CONSTRUCTOR;
static {
try {
var lookup = MethodHandles.privateLookupIn(MapMode.class, MethodHandles.lookup());
PrivilegedExceptionAction<Lookup> pae = () ->
MethodHandles.privateLookupIn(MapMode.class, MethodHandles.lookup());
Lookup lookup = AccessController.doPrivileged(pae);
var methodType = MethodType.methodType(void.class, String.class);
MAP_MODE_CONSTRUCTOR = lookup.findConstructor(MapMode.class, methodType);
} catch (Exception e) {