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Date: Tue, 01 Mar 2011 17:07:43 +0800
From: Eugene Teo <>
CC: "Steven M. Christey" <>
Subject: Re: CVE request - kernel: xfs infoleak

On 02/16/2011 04:41 PM, Eugene Teo wrote:
>  From Dan R0s3nbug5, "The FSGEOMETRY_V1 ioctl (and its compat
> equivalent) calls out to xfs_fs_geometry() with a version number of 3.
> This code path does not fill in the logsunit member of the passed
> xfs_fsop_geom_t, leading to the leaking of four bytes of uninitialized
> stack data to potentially unprivileged callers. Since all other members
> are filled in all code paths and there are no padding bytes in this
> structure, it's safe to avoid an expensive memset() in favor of just
> clearing this one field."

There's an issue with the patch, here's the fix to the fix:

Eugene Teo / Red Hat Security Response Team

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