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Re: [Qemu-devel] [PATCH v1] i2c: pm_smbus: check smb_index before block

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v1] i2c: pm_smbus: check smb_index before block transfer write
Date: Thu, 6 Dec 2018 16:46:37 +0000

On Thu, 6 Dec 2018 at 12:20, P J P <address@hidden> wrote:
> From: Prasad J Pandit <address@hidden>
> While performing block transfer write in smb_ioport_writeb(),
> 'smb_index' is incremented and used to index smb_data[] array.
> Check 'smb_index' value to avoid OOB access.
> Note that this bug is exploitable by a guest to escape
> from the virtual machine. However the commit which
> introduced the bug was only made after the 3.0 release,
> and so it is not present in any released QEMU versions.
> Fixes: 38ad4fae43 i2c: pm_smbus: Add block transfer capability
> Reported-by: Michael Hanselmann <address@hidden>
> Signed-off-by: Prasad J Pandit <address@hidden>
> ---
>  hw/i2c/pm_smbus.c | 3 +++
>  1 file changed, 3 insertions(+)
> Update v1: add note about issue being introduced after 3.0 release
>   -> https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg01115.html

Applied, thanks.

-- PMM

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