capget() overflows buffers.

[Dave Jones]

We had a user file a bug report recently that sys_capget is overflowing
a user buffer.

More details and test program are available at
https://bugzilla.redhat.com/show_bug.cgi?id=447518

The only recent change in this area was e338d263a76af78fe8f38a72131188b58fceb591
"Add 64-bit capability support to the kernel".

	Dave


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