This is a note to let you know that I've just added the patch titled
drm: Pad drm_mode_get_connector to 64-bit boundary
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-pad-drm_mode_get_connector-to-64-bit-boundary.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bc5bd37ce48c66e9192ad2e7231e9678880f6f8e Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Oct 2013 09:49:02 +0100
Subject: drm: Pad drm_mode_get_connector to 64-bit boundary
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
commit bc5bd37ce48c66e9192ad2e7231e9678880f6f8e upstream.
Pavel Roskin reported that DRM_IOCTL_MODE_GETCONNECTOR was overwritting
the 4 bytes beyond the end of its structure with a 32-bit userspace
running on a 64-bit kernel. This is due to the padding gcc inserts as
the drm_mode_get_connector struct includes a u64 and its size is not a
natural multiple of u64s.
64-bit kernel:
sizeof(drm_mode_get_connector)=80, alignof=8
sizeof(drm_mode_get_encoder)=20, alignof=4
sizeof(drm_mode_modeinfo)=68, alignof=4
32-bit userspace:
sizeof(drm_mode_get_connector)=76, alignof=4
sizeof(drm_mode_get_encoder)=20, alignof=4
sizeof(drm_mode_modeinfo)=68, alignof=4
Fortuituously we can insert explicit padding to the tail of our
structures without breaking ABI.
Reported-by: Pavel Roskin <proski@xxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/uapi/drm/drm_mode.h | 2 ++
1 file changed, 2 insertions(+)
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -223,6 +223,8 @@ struct drm_mode_get_connector {
__u32 connection;
__u32 mm_width, mm_height; /**< HxW in millimeters */
__u32 subpixel;
+
+ __u32 pad;
};
#define DRM_MODE_PROP_PENDING (1<<0)
Patches currently in stable-queue which might be from chris@xxxxxxxxxxxxxxxxxx are
queue-3.10/drm-prevent-overwriting-from-userspace-underallocating-core-ioctl-structs.patch
queue-3.10/drm-pad-drm_mode_get_connector-to-64-bit-boundary.patch
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