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SubjectRe: [Stable-review] [18/74] xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1
On Wed, 2011-04-13 at 08:50 -0700, Greg KH wrote:
> 2.6.32-longterm review patch. If anyone has any objections, please let us know.
> ------------------
> From: Dan Rosenberg <>
> commit c4d0c3b097f7584772316ee4d64a09fe0e4ddfca upstream.
> 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.

This caused a serious regression and requires a second fix:

commit af24ee9ea8d532e16883251a6684dfa1be8eec29
Author: Alex Elder <>
Date: Tue Mar 1 17:50:00 2011 +0000

xfs: zero proper structure size for geometry calls


Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.
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