On 04/20/2011 11:48 PM, Leann Ogasawara wrote:
> The following changes since commit c34e0e04a2ea4b8c3af37e1f621c8ab61642200c:
> Dan Rosenberg (1):
> CAN: Use inode instead of kernel address for /proc file, CVE-2010-4565
>
> are available in the git repository at:
>
> git://kernel.ubuntu.com/ogasawara/ubuntu-maverick.git CVE-2011-0711
>
> Dan Rosenberg (1):
> xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1, CVE-2011-0711
>
> fs/xfs/xfs_fsops.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> From 695e59df936c802f5e528b089ec209e7b987d8fb Mon Sep 17 00:00:00 2001
> From: Dan Rosenberg <drosenberg@vsecurity.com>
> Date: Mon, 14 Feb 2011 13:45:28 +0000
> Subject: [PATCH] xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1, CVE-2011-0711
>
> BugLink: http://bugs.launchpad.net/bugs/767740
>
> CVE-2011-0711
>
> 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.
>
> v2 switches to memset() to avoid future issues if structure members
> change, on suggestion of Dave Chinner.
>
> Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
> Reviewed-by: Eugene Teo <eugeneteo@kernel.org>
> Signed-off-by: Alex Elder <aelder@sgi.com>
> (cherry picked from commit 3a3675b7f23f83ca8c67c9c2b6edf707fd28d1ba)
>
> Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
> ---
> fs/xfs/xfs_fsops.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
> index 37a6f62..4e7f02b 100644
> --- a/fs/xfs/xfs_fsops.c
> +++ b/fs/xfs/xfs_fsops.c
> @@ -57,6 +57,9 @@ xfs_fs_geometry(
> xfs_fsop_geom_t *geo,
> int new_version)
> {
> +
> + memset(geo, 0, sizeof(*geo));
> +
> geo->blocksize = mp->m_sb.sb_blocksize;
> geo->rtextsize = mp->m_sb.sb_rextsize;
> geo->agblocks = mp->m_sb.sb_agblocks;
Looks safe enough.
Acked-by: Stefan Bader <stefan.bade@canonical.com>
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xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1, CVE-2011-0711
