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 6.8-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-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a37ef7613c00f2d72c8fc08bd83fb6cc76926c8c Mon Sep 17 00:00:00 2001
From: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Date: Thu, 25 Apr 2024 15:27:48 -0400
Subject: drm/vmwgfx: Fix invalid reads in fence signaled events
From: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
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 <zack.rusin@xxxxxxxxxxxx>
Fixes: 8b7de6aa8468 ("vmwgfx: Rework fence event action")
Reported-by: zdi-disclosures@xxxxxxxxxxxxxx # ZDI-CAN-23566
Cc: David Airlie <airlied@xxxxxxxxx>
CC: Daniel Vetter <daniel@xxxxxxxx>
Cc: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v3.4+
Reviewed-by: Maaz Mombasawala <maaz.mombasawala@xxxxxxxxxxxx>
Reviewed-by: Martin Krastev <martin.krastev@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240425192748.1761522-1-zack.rusin@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -991,7 +991,7 @@ 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 zack.rusin@xxxxxxxxxxxx are
queue-6.8/drm-ttm-print-the-memory-decryption-status-just-once.patch
queue-6.8/drm-vmwgfx-fix-legacy-display-unit.patch
queue-6.8/drm-vmwgfx-fix-invalid-reads-in-fence-signaled-events.patch
