89 lines
1.8 KiB
Java
89 lines
1.8 KiB
Java
/* This test checks for two slightly different overflow scenarios in
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* array allocation.
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*
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* The first is that the number of bytes needed for an array size
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* overflows on a 32 bit machine.
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*
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* The second is that on a 64 machine, the number of bytes silently
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* gets truncated, resulting in too small an object being
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* allocated. */
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class newarray_overflow
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{
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static boolean failed = false;
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static void int_check()
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{
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int[] x;
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try
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{
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x = new int [1 << 30];
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}
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catch (OutOfMemoryError e)
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{
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return;
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}
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/* If we really get away with it (64 bit machine), that's cool. */
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if (x == null) {
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System.err.println ("int check: new returned null.");
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failed = true;
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return;
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}
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try
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{
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// Only check a few places so we don't thrash too badly.
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for (int i = 0; i < x.length; i += (1 << 24))
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if (x[i] != 0)
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failed = true;
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}
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catch (Throwable e)
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{
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System.err.print ("int check: ");
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System.err.println (e);
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failed = true;
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}
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}
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static void object_check()
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{
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Object[] x;
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try
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{
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x = new Object [1 << 30];
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System.err.println ("Alloc succeeded.");
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System.err.println (x);
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}
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catch (OutOfMemoryError e)
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{
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return;
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}
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/* If we really get away with it (64 bit machine), that's cool. */
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if (x == null) {
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System.err.println ("Object check: new returned null.");
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failed = true;
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return;
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}
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try
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{
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for (int i = 0; i < x.length; i += (1 << 24))
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if (x[i] != null)
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failed = true;
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}
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catch (Throwable e)
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{
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System.err.print ("Object check: ");
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System.err.println (e);
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failed = true;
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}
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}
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public static void main (String[] ignore)
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{
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int_check();
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object_check();
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if (!failed)
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System.out.println ("ok");
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}
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}
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