diff options
| author |   Zack Rusin <zackr@vmware.com> | 2022-10-25 23:19:35 -0400 |
|---|---|---|
| committer | Zack Rusin <zackr@vmware.com> | 2022-10-31 11:50:23 -0400 |
| commit | 4cf949c7fafe21e085a4ee386bb2dade9067316e (patch) | |
| tree | 934fb69424571c5eebf770ebe2efd4e24f9e4da2 /drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | |
| parent | drm/rockchip: lvds: fix PM usage counter unbalance in poweron (diff) | |
| download | linux-4cf949c7fafe21e085a4ee386bb2dade9067316e.tar.xz linux-4cf949c7fafe21e085a4ee386bb2dade9067316e.zip | |
drm/vmwgfx: Validate the box size for the snooped cursor
Invalid userspace dma surface copies could potentially overflow
the memcpy from the surface to the snooped image leading to crashes.
To fix it the dimensions of the copybox have to be validated
against the expected size of the snooped cursor.
Signed-off-by: Zack Rusin <zackr@vmware.com>
Fixes: 2ac863719e51 ("vmwgfx: Snoop DMA transfers with non-covering sizes")
Cc: <stable@vger.kernel.org> # v3.2+
Reviewed-by: Michael Banack <banackm@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221026031936.1004280-1-zack@kde.org
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_kms.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c index 0342efdf9063..d434b6ae1092 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -393,7 +393,8 @@ void vmw_kms_cursor_snoop(struct vmw_surface *srf, if (cmd->dma.guest.ptr.offset % PAGE_SIZE || box->x != 0 || box->y != 0 || box->z != 0 || box->srcx != 0 || box->srcy != 0 || box->srcz != 0 || - box->d != 1 || box_count != 1) { + box->d != 1 || box_count != 1 || + box->w > 64 || box->h > 64) { /* TODO handle none page aligned offsets */ /* TODO handle more dst & src != 0 */ /* TODO handle more then one copy */ |