linux-kernel - [PATCH 5.1 73/85] drm/vmwgfx: Fix compat mode shader operation

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Date:   Fri,  7 Jun 2019 17:39:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Hellstrom <thellstrom@...are.com>,
        Brian Paul <brianp@...are.com>
Subject: [PATCH 5.1 73/85] drm/vmwgfx: Fix compat mode shader operation

From: Thomas Hellstrom <thellstrom@...are.com>

commit e41c20cf50a8a7d0dfa337a7530590aacef4193b upstream.

In compat mode, we allowed host-backed user-space with guest-backed
kernel / device. In this mode, set shader commands was broken since
no relocations were emitted. Fix this.

Cc: <stable@...r.kernel.org>
Fixes: e8c66efbfe3a ("drm/vmwgfx: Make user resource lookups reference-free during validation")
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Brian Paul <brianp@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2129,6 +2129,11 @@ static int vmw_cmd_set_shader(struct vmw
 		return 0;
 
 	if (cmd->body.shid != SVGA3D_INVALID_ID) {
+		/*
+		 * This is the compat shader path - Per device guest-backed
+		 * shaders, but user-space thinks it's per context host-
+		 * backed shaders.
+		 */
 		res = vmw_shader_lookup(vmw_context_res_man(ctx),
 					cmd->body.shid,
 					cmd->body.type);
@@ -2137,6 +2142,14 @@ static int vmw_cmd_set_shader(struct vmw
 			ret = vmw_execbuf_res_noctx_val_add(sw_context, res);
 			if (unlikely(ret != 0))
 				return ret;
+
+			ret = vmw_resource_relocation_add
+				(sw_context, res,
+				 vmw_ptr_diff(sw_context->buf_start,
+					      &cmd->body.shid),
+				 vmw_res_rel_normal);
+			if (unlikely(ret != 0))
+				return ret;
 		}
 	}