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Date: Wed, 10 Nov 2010 14:31:25 -0500 (EST)
From: Josh Bressers <>
To:, Petr Matousek <>
Subject: Re: CVE request: kernel: gdth: integer overflow in

Please use CVE-2010-4157



----- "Petr Matousek" <> wrote:

> "gdth_ioctl_alloc() takes the size variable as an int.
> copy_from_user() takes the size variable as an unsigned long.
> gen.data_len and gen.sense_len are unsigned longs.
> On x86_64 longs are 64 bit and ints are 32 bit.
> We could pass in a very large number and the allocation would
> truncate
> the size to 32 bits and allocate a small buffer.  Then when we do the
> copy_from_user(), it would result in a memory corruption."
> Upstream commit:
> Credit: James E.J. Bottomley
> Reference:
> Thanks,
> --
> Petr Matousek / Red Hat Security Response Team

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