[PATCH 3/7] drm: verify vma access in TTM+GEM drivers

[David Herrmann]

GEM does already a good job in tracking access to gem buffers via handles
and drm_vma access management. However, TTM drivers currently do not
verify this during mmap().

TTM provides the verify_access() callback to test this. So fix all drivers
to actually call into gem+vma to verify access instead of always returning
0.

All drivers assume that user-space can only get access to TTM buffers via
GEM handles. So whenever the verify_access() callback is called from
ttm_bo_mmap(), the buffer must have a valid embedded gem object. This is
true for all TTM+GEM drivers. But that's why this patch doesn't touch pure
TTM drivers (ie, vmwgfx).

v2: Switch to drm_vma_node_verify_access() to correctly return -EACCES if
    access was denied.

Cc: Dave Airlie <airlied at redhat.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst at canonical.com>
Cc: Jerome Glisse <jglisse at redhat.com>
Signed-off-by: David Herrmann <dh.herrmann at gmail.com>
---
 drivers/gpu/drm/ast/ast_ttm.c         | 4 +++-
 drivers/gpu/drm/cirrus/cirrus_ttm.c   | 4 +++-
 drivers/gpu/drm/mgag200/mgag200_ttm.c | 4 +++-
 drivers/gpu/drm/nouveau/nouveau_bo.c  | 4 +++-
 drivers/gpu/drm/qxl/qxl_ttm.c         | 4 +++-
 drivers/gpu/drm/radeon/radeon_ttm.c   | 4 +++-
 6 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index cf1c833..20fcf4e 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -148,7 +148,9 @@ ast_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 
 static int ast_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
-	return 0;
+	struct ast_bo *astbo = ast_bo(bo);
+
+	return drm_vma_node_verify_access(&astbo->gem.vma_node, filp);
 }
 
 static int ast_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
index bf8a506..ae2385c 100644
--- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
+++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
@@ -148,7 +148,9 @@ cirrus_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 
 static int cirrus_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
-	return 0;
+	struct cirrus_bo *cirrusbo = cirrus_bo(bo);
+
+	return drm_vma_node_verify_access(&cirrusbo->gem.vma_node, filp);
 }
 
 static int cirrus_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/mgag200/mgag200_ttm.c b/drivers/gpu/drm/mgag200/mgag200_ttm.c
index 6cf3fa0..fd4539d 100644
--- a/drivers/gpu/drm/mgag200/mgag200_ttm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_ttm.c
@@ -148,7 +148,9 @@ mgag200_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 
 static int mgag200_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
-	return 0;
+	struct mgag200_bo *mgabo = mgag200_bo(bo);
+
+	return drm_vma_node_verify_access(&mgabo->gem.vma_node, filp);
 }
 
 static int mgag200_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 4e7ee5f..e4444ba 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1260,7 +1260,9 @@ out:
 static int
 nouveau_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
-	return 0;
+	struct nouveau_bo *nvbo = nouveau_bo(bo);
+
+	return drm_vma_node_verify_access(&nvbo->gem->vma_node, filp);
 }
 
 static int
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 1dfd84c..037786d 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -212,7 +212,9 @@ static void qxl_evict_flags(struct ttm_buffer_object *bo,
 
 static int qxl_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
-	return 0;
+	struct qxl_bo *qbo = to_qxl_bo(bo);
+
+	return drm_vma_node_verify_access(&qbo->gem_base.vma_node, filp);
 }
 
 static int qxl_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 6c0ce89..71245d6 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -203,7 +203,9 @@ static void radeon_evict_flags(struct ttm_buffer_object *bo,
 
 static int radeon_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
-	return 0;
+	struct radeon_bo *rbo = container_of(bo, struct radeon_bo, tbo);
+
+	return drm_vma_node_verify_access(&rbo->gem_base.vma_node, filp);
 }
 
 static void radeon_move_null(struct ttm_buffer_object *bo,
-- 
1.8.4