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Add a check for >>> vm_flags & VM_WRITE to avoid mmap failures on private read-only or >>> PROT_NONE mappings. >>> >>> v2: protect against mprotect making a mapping writable after the fact >>> v3: update driver-specific vm_operations_structs >>> >>> Fixes: f91142c62161 ("drm/ttm: nuke VM_MIXEDMAP on BO mappings v3") >>> Signed-off-by: Felix Kuehling >>> Signed-off-by: Alex Deucher >> Reviewed-by: Christian König > Are you planning to push this to drm-misc? Yes, just didn't found time yesterday. Christian. > > Alex > >>> --- >>> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 3 ++- >>> drivers/gpu/drm/nouveau/nouveau_gem.c | 3 ++- >>> drivers/gpu/drm/radeon/radeon_gem.c | 3 ++- >>> drivers/gpu/drm/ttm/ttm_bo_vm.c | 14 +++++++++++++- >>> drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c | 1 + >>> include/drm/ttm/ttm_bo_api.h | 4 ++++ >>> 6 files changed, 24 insertions(+), 4 deletions(-) >>> >>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>> index b3404c43a911..1aa750a6a5d2 100644 >>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c >>> @@ -79,7 +79,8 @@ static const struct vm_operations_struct amdgpu_gem_vm_ops = { >>> .fault = amdgpu_gem_fault, >>> .open = ttm_bo_vm_open, >>> .close = ttm_bo_vm_close, >>> - .access = ttm_bo_vm_access >>> + .access = ttm_bo_vm_access, >>> + .mprotect = ttm_bo_vm_mprotect >>> }; >>> >>> static void amdgpu_gem_object_free(struct drm_gem_object *gobj) >>> diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c >>> index 5b27845075a1..164ea564bb7a 100644 >>> --- a/drivers/gpu/drm/nouveau/nouveau_gem.c >>> +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c >>> @@ -70,7 +70,8 @@ static const struct vm_operations_struct nouveau_ttm_vm_ops = { >>> .fault = nouveau_ttm_fault, >>> .open = ttm_bo_vm_open, >>> .close = ttm_bo_vm_close, >>> - .access = ttm_bo_vm_access >>> + .access = ttm_bo_vm_access, >>> + .mprotect = ttm_bo_vm_mprotect >>> }; >>> >>> void >>> diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c >>> index 458f92a70887..c19ad07eb7b5 100644 >>> --- a/drivers/gpu/drm/radeon/radeon_gem.c >>> +++ b/drivers/gpu/drm/radeon/radeon_gem.c >>> @@ -77,7 +77,8 @@ static const struct vm_operations_struct radeon_gem_vm_ops = { >>> .fault = radeon_gem_fault, >>> .open = ttm_bo_vm_open, >>> .close = ttm_bo_vm_close, >>> - .access = ttm_bo_vm_access >>> + .access = ttm_bo_vm_access, >>> + .mprotect = ttm_bo_vm_mprotect >>> }; >>> >>> static void radeon_gem_object_free(struct drm_gem_object *gobj) >>> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c >>> index f56be5bc0861..fb325bad5db6 100644 >>> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c >>> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c >>> @@ -542,17 +542,29 @@ int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr, >>> } >>> EXPORT_SYMBOL(ttm_bo_vm_access); >>> >>> +int ttm_bo_vm_mprotect(struct vm_area_struct *vma, unsigned long start, >>> + unsigned long end, unsigned long newflags) >>> +{ >>> + /* Enforce no COW since would have really strange behavior with it. */ >>> + if (is_cow_mapping(newflags) && (newflags & VM_WRITE)) >>> + return -EINVAL; >>> + >>> + return 0; >>> +} >>> +EXPORT_SYMBOL(ttm_bo_vm_mprotect); >>> + >>> static const struct vm_operations_struct ttm_bo_vm_ops = { >>> .fault = ttm_bo_vm_fault, >>> .open = ttm_bo_vm_open, >>> .close = ttm_bo_vm_close, >>> .access = ttm_bo_vm_access, >>> + .mprotect = ttm_bo_vm_mprotect, >>> }; >>> >>> int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo) >>> { >>> /* Enforce no COW since would have really strange behavior with it. */ >>> - if (is_cow_mapping(vma->vm_flags)) >>> + if (is_cow_mapping(vma->vm_flags) && (vma->vm_flags & VM_WRITE)) >>> return -EINVAL; >>> >>> ttm_bo_get(bo); >>> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c >>> index e6b1f98ec99f..e4bf7dc99320 100644 >>> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c >>> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c >>> @@ -61,6 +61,7 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma) >>> .fault = vmw_bo_vm_fault, >>> .open = ttm_bo_vm_open, >>> .close = ttm_bo_vm_close, >>> + .mprotect = ttm_bo_vm_mprotect, >>> #ifdef CONFIG_TRANSPARENT_HUGEPAGE >>> .huge_fault = vmw_bo_vm_huge_fault, >>> #endif >>> diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h >>> index f681bbdbc698..40eb95875355 100644 >>> --- a/include/drm/ttm/ttm_bo_api.h >>> +++ b/include/drm/ttm/ttm_bo_api.h >>> @@ -605,6 +605,10 @@ void ttm_bo_vm_close(struct vm_area_struct *vma); >>> >>> int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr, >>> void *buf, int len, int write); >>> + >>> +int ttm_bo_vm_mprotect(struct vm_area_struct *vma, unsigned long start, >>> + unsigned long end, unsigned long newflags); >>> + >>> bool ttm_bo_delayed_delete(struct ttm_device *bdev, bool remove_all); >>> >>> vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot); From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, 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