From: David Herrmann Date: Sun, 25 Aug 2013 16:28:59 +0000 (+0200) Subject: drm: verify vma access in TTM+GEM drivers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=acb4652703f0a452405a3ab9319594eddc41391b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Cc: Alex Deucher Cc: Ben Skeggs Cc: Maarten Lankhorst Cc: Jerome Glisse Signed-off-by: David Herrmann Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c index cf1c833f73ca..20fcf4ee3af0 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 bf8a50669489..ae2385cc71cb 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 6cf3fa0b35cc..fd4539d9ad2c 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 4e7ee5f4155c..e4444bacd0b2 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 1dfd84cda2a1..037786d7c1dc 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 6c0ce8915fac..71245d6f34a2 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,