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authorDavid Herrmann <dh.herrmann@gmail.com>2013-08-25 18:28:59 +0200
committerDave Airlie <airlied@redhat.com>2013-08-27 11:54:58 +1000
commitacb4652703f0a452405a3ab9319594eddc41391b (patch)
tree588ca6991d01ce7e560f39cec65e4fc41b150dd6
parentca481c9b2a3ae3598453535b8f0369f1f875d52f (diff)
drm: verify vma access in TTM+GEM drivers
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@redhat.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com> Cc: Jerome Glisse <jglisse@redhat.com> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
-rw-r--r--drivers/gpu/drm/ast/ast_ttm.c4
-rw-r--r--drivers/gpu/drm/cirrus/cirrus_ttm.c4
-rw-r--r--drivers/gpu/drm/mgag200/mgag200_ttm.c4
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_bo.c4
-rw-r--r--drivers/gpu/drm/qxl/qxl_ttm.c4
-rw-r--r--drivers/gpu/drm/radeon/radeon_ttm.c4
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 cf1c833f73c..20fcf4ee3af 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 bf8a5066948..ae2385cc71c 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 6cf3fa0b35c..fd4539d9ad2 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 4e7ee5f4155..e4444bacd0b 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 1dfd84cda2a..037786d7c1d 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 6c0ce8915fa..71245d6f34a 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,