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authorDan Rosenberg <drosenberg@vsecurity.com>2011-02-14 13:45:28 +0000
committerAlex Elder <aelder@sgi.com>2011-02-22 15:06:47 -0600
commit3a3675b7f23f83ca8c67c9c2b6edf707fd28d1ba (patch)
treeca218171c9493272b40a4bb9c9a2099ba1240a47
parentd8204a37baf5474d3154eb536c936369be2bd5c0 (diff)
xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1
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>
-rw-r--r--fs/xfs/xfs_fsops.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index cec89dd5d7d2..85668efb3e3e 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -53,6 +53,9 @@ 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;