Commit af24ee9e authored by Alex Elder's avatar Alex Elder

xfs: zero proper structure size for geometry calls

Commit 493f3358 added this call to
xfs_fs_geometry() in order to avoid passing kernel stack data back
to user space:

+       memset(geo, 0, sizeof(*geo));

Unfortunately, one of the callers of that function passes the
address of a smaller data type, cast to fit the type that
xfs_fs_geometry() requires.  As a result, this can happen:

Kernel panic - not syncing: stack-protector: Kernel stack is corrupted
in: f87aca93

Pid: 262, comm: xfs_fsr Not tainted 2.6.38-rc6-493f3358+ #1
Call Trace:

[<c12991ac>] ? panic+0x50/0x150
[<c102ed71>] ? __stack_chk_fail+0x10/0x18
[<f87aca93>] ? xfs_ioc_fsgeometry_v1+0x56/0x5d [xfs]

Fix this by fixing that one caller to pass the right type and then
copy out the subset it is interested in.

Note: This patch is an alternative to one originally proposed by
Eric Sandeen.
Reported-by: default avatarJeffrey Hundstad <jeffrey.hundstad@mnsu.edu>
Signed-off-by: default avatarAlex Elder <aelder@sgi.com>
Reviewed-by: default avatarEric Sandeen <sandeen@redhat.com>
Tested-by: default avatarJeffrey Hundstad <jeffrey.hundstad@mnsu.edu>
parent dd9c1549
...@@ -695,14 +695,19 @@ xfs_ioc_fsgeometry_v1( ...@@ -695,14 +695,19 @@ xfs_ioc_fsgeometry_v1(
xfs_mount_t *mp, xfs_mount_t *mp,
void __user *arg) void __user *arg)
{ {
xfs_fsop_geom_v1_t fsgeo; xfs_fsop_geom_t fsgeo;
int error; int error;
error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3); error = xfs_fs_geometry(mp, &fsgeo, 3);
if (error) if (error)
return -error; return -error;
if (copy_to_user(arg, &fsgeo, sizeof(fsgeo))) /*
* Caller should have passed an argument of type
* xfs_fsop_geom_v1_t. This is a proper subset of the
* xfs_fsop_geom_t that xfs_fs_geometry() fills in.
*/
if (copy_to_user(arg, &fsgeo, sizeof(xfs_fsop_geom_v1_t)))
return -XFS_ERROR(EFAULT); return -XFS_ERROR(EFAULT);
return 0; return 0;
} }
......
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