This is a note to let you know that I've just added the patch titled
drm/vmwgfx: Fix invalid reads in fence signaled events
to the 5.15-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-vmwgfx-fix-invalid-reads-in-fence-signaled-events.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a37ef7613c00f2d72c8fc08bd83fb6cc76926c8c Mon Sep 17 00:00:00 2001
From: Zack Rusin <[email protected]>
Date: Thu, 25 Apr 2024 15:27:48 -0400
Subject: drm/vmwgfx: Fix invalid reads in fence signaled events
From: Zack Rusin <[email protected]>
commit a37ef7613c00f2d72c8fc08bd83fb6cc76926c8c upstream.
Correctly set the length of the drm_event to the size of the structure
that's actually used.
The length of the drm_event was set to the parent structure instead of
to the drm_vmw_event_fence which is supposed to be read. drm_read
uses the length parameter to copy the event to the user space thus
resuling in oob reads.
Signed-off-by: Zack Rusin <[email protected]>
Fixes: 8b7de6aa8468 ("vmwgfx: Rework fence event action")
Reported-by: [email protected] # ZDI-CAN-23566
Cc: David Airlie <[email protected]>
CC: Daniel Vetter <[email protected]>
Cc: Zack Rusin <[email protected]>
Cc: Broadcom internal kernel review list <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: <[email protected]> # v3.4+
Reviewed-by: Maaz Mombasawala <[email protected]>
Reviewed-by: Martin Krastev <[email protected]>
Link:
https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
@@ -1068,7 +1068,7 @@ static int vmw_event_fence_action_create
}
event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
- event->event.base.length = sizeof(*event);
+ event->event.base.length = sizeof(event->event);
event->event.user_data = user_data;
ret = drm_event_reserve_init(dev, file_priv, &event->base,
&event->event.base);
Patches currently in stable-queue which might be from [email protected]
are
queue-5.15/drm-vmwgfx-fix-invalid-reads-in-fence-signaled-events.patch
