Re: [Qemu-devel] [PATCH] SVM IOIO intercept does not check all bits

[Bernhard Kauer]

On Fri, Dec 07, 2007 at 04:16:00PM +0100, Alexander Graf wrote:
>>>> For IN/OUT instructions that access more than a single byte, the
>>>> permission bits for all bytes are checked; if any bit is set to 1,
>>>> the I/O operation is intercepted.
>>>>
>
> That was the one. Thank you.


Unfortunately there is another bug in this line. As there
is only a single byte read from the permission bitmap, an
unaligned 4-byte access to port 0x7 would be possible even
when the access to port 0x8-0xa is not allowed. The updated
patch fixes also this case.


        Bernhard Kauer

qemu_ioio.diff
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