vmwgfx: Implement memory accounting for resources
Contexts, surfaces and streams allocate persistent kernel memory as the direct result of user-space requests. Make sure this memory is accounted as graphics memory, to avoid DOS vulnerabilities. Also take the TTM read lock around resource creation to block switched-out dri clients from allocating resources. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>hifive-unleashed-5.1
Thomas Hellstrom
Dave Airlie
parent
1c248b7d29
commit
414ee50b3a
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@ -39,6 +39,7 @@ struct vmw_user_context {
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struct vmw_user_surface {
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struct ttm_base_object base;
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struct vmw_surface srf;
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uint32_t size;
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};
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struct vmw_user_dma_buffer {
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@ -67,6 +68,11 @@ struct vmw_surface_offset {
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uint32_t bo_offset;
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};
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static uint64_t vmw_user_context_size;
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static uint64_t vmw_user_surface_size;
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static uint64_t vmw_user_stream_size;
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static inline struct vmw_dma_buffer *
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vmw_dma_buffer(struct ttm_buffer_object *bo)
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{
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@ -343,8 +349,11 @@ static void vmw_user_context_free(struct vmw_resource *res)
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{
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struct vmw_user_context *ctx =
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container_of(res, struct vmw_user_context, res);
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struct vmw_private *dev_priv = res->dev_priv;
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kfree(ctx);
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ttm_mem_global_free(vmw_mem_glob(dev_priv),
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vmw_user_context_size);
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}
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/**
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@ -398,23 +407,56 @@ int vmw_context_define_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct vmw_private *dev_priv = vmw_priv(dev);
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struct vmw_user_context *ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
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struct vmw_user_context *ctx;
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struct vmw_resource *res;
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struct vmw_resource *tmp;
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struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
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struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
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struct vmw_master *vmaster = vmw_master(file_priv->master);
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int ret;
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if (unlikely(ctx == NULL))
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return -ENOMEM;
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/*
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* Approximate idr memory usage with 128 bytes. It will be limited
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* by maximum number_of contexts anyway.
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*/
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if (unlikely(vmw_user_context_size == 0))
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vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 128;
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ret = ttm_read_lock(&vmaster->lock, true);
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if (unlikely(ret != 0))
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return ret;
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ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
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vmw_user_context_size,
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false, true);
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if (unlikely(ret != 0)) {
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if (ret != -ERESTARTSYS)
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DRM_ERROR("Out of graphics memory for context"
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" creation.\n");
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goto out_unlock;
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}
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ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
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if (unlikely(ctx == NULL)) {
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ttm_mem_global_free(vmw_mem_glob(dev_priv),
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vmw_user_context_size);
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ret = -ENOMEM;
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goto out_unlock;
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}
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res = &ctx->res;
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ctx->base.shareable = false;
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ctx->base.tfile = NULL;
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/*
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* From here on, the destructor takes over resource freeing.
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*/
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ret = vmw_context_init(dev_priv, res, vmw_user_context_free);
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if (unlikely(ret != 0))
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return ret;
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goto out_unlock;
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tmp = vmw_resource_reference(&ctx->res);
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ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
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@ -428,6 +470,8 @@ int vmw_context_define_ioctl(struct drm_device *dev, void *data,
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arg->cid = res->id;
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out_err:
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vmw_resource_unreference(&res);
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out_unlock:
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ttm_read_unlock(&vmaster->lock);
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return ret;
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}
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@ -1095,6 +1139,8 @@ static void vmw_user_surface_free(struct vmw_resource *res)
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struct vmw_surface *srf = container_of(res, struct vmw_surface, res);
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struct vmw_user_surface *user_srf =
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container_of(srf, struct vmw_user_surface, srf);
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struct vmw_private *dev_priv = srf->res.dev_priv;
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uint32_t size = user_srf->size;
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if (srf->backup)
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ttm_bo_unref(&srf->backup);
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@ -1102,6 +1148,7 @@ static void vmw_user_surface_free(struct vmw_resource *res)
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kfree(srf->sizes);
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kfree(srf->snooper.image);
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kfree(user_srf);
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ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
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}
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/**
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@ -1226,9 +1273,45 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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struct vmw_surface_offset *cur_offset;
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uint32_t stride_bpp;
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uint32_t bpp;
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uint32_t num_sizes;
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uint32_t size;
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struct vmw_master *vmaster = vmw_master(file_priv->master);
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if (unlikely(user_srf == NULL))
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return -ENOMEM;
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if (unlikely(vmw_user_surface_size == 0))
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vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
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128;
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num_sizes = 0;
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for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
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num_sizes += req->mip_levels[i];
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if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
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DRM_VMW_MAX_MIP_LEVELS)
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return -EINVAL;
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size = vmw_user_surface_size + 128 +
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ttm_round_pot(num_sizes * sizeof(struct drm_vmw_size)) +
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ttm_round_pot(num_sizes * sizeof(struct vmw_surface_offset));
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ret = ttm_read_lock(&vmaster->lock, true);
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if (unlikely(ret != 0))
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return ret;
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ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
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size, false, true);
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if (unlikely(ret != 0)) {
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if (ret != -ERESTARTSYS)
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DRM_ERROR("Out of graphics memory for surface"
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" creation.\n");
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goto out_unlock;
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}
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user_srf = kmalloc(sizeof(*user_srf), GFP_KERNEL);
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if (unlikely(user_srf == NULL)) {
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ret = -ENOMEM;
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goto out_no_user_srf;
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}
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srf = &user_srf->srf;
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res = &srf->res;
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@ -1239,20 +1322,13 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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srf->backup = NULL;
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memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
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srf->num_sizes = 0;
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for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
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srf->num_sizes += srf->mip_levels[i];
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if (srf->num_sizes > DRM_VMW_MAX_SURFACE_FACES *
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DRM_VMW_MAX_MIP_LEVELS) {
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ret = -EINVAL;
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goto out_err0;
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}
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srf->num_sizes = num_sizes;
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user_srf->size = size;
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srf->sizes = kmalloc(srf->num_sizes * sizeof(*srf->sizes), GFP_KERNEL);
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if (unlikely(srf->sizes == NULL)) {
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ret = -ENOMEM;
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goto out_err0;
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goto out_no_sizes;
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}
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srf->offsets = kmalloc(srf->num_sizes * sizeof(*srf->offsets),
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GFP_KERNEL);
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@ -1268,7 +1344,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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srf->num_sizes * sizeof(*srf->sizes));
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if (unlikely(ret != 0)) {
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ret = -EFAULT;
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goto out_err1;
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goto out_no_copy;
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}
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cur_bo_offset = 0;
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@ -1305,7 +1381,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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if (!srf->snooper.image) {
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DRM_ERROR("Failed to allocate cursor_image\n");
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ret = -ENOMEM;
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goto out_err1;
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goto out_no_copy;
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}
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} else {
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srf->snooper.image = NULL;
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@ -1322,7 +1398,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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ret = vmw_surface_init(dev_priv, srf, vmw_user_surface_free);
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if (unlikely(ret != 0))
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return ret;
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goto out_unlock;
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tmp = vmw_resource_reference(&srf->res);
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ret = ttm_base_object_init(tfile, &user_srf->base,
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@ -1332,7 +1408,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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if (unlikely(ret != 0)) {
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vmw_resource_unreference(&tmp);
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vmw_resource_unreference(&res);
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return ret;
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goto out_unlock;
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}
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rep->sid = user_srf->base.hash.key;
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@ -1340,13 +1416,19 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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DRM_ERROR("Created bad Surface ID.\n");
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vmw_resource_unreference(&res);
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ttm_read_unlock(&vmaster->lock);
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return 0;
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out_err1:
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out_no_copy:
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kfree(srf->offsets);
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out_no_offsets:
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kfree(srf->sizes);
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out_err0:
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out_no_sizes:
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kfree(user_srf);
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out_no_user_srf:
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ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
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out_unlock:
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ttm_read_unlock(&vmaster->lock);
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return ret;
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}
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@ -1690,8 +1772,11 @@ static void vmw_user_stream_free(struct vmw_resource *res)
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{
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struct vmw_user_stream *stream =
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container_of(res, struct vmw_user_stream, stream.res);
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struct vmw_private *dev_priv = res->dev_priv;
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kfree(stream);
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ttm_mem_global_free(vmw_mem_glob(dev_priv),
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vmw_user_stream_size);
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}
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/**
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@ -1745,23 +1830,56 @@ int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct vmw_private *dev_priv = vmw_priv(dev);
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struct vmw_user_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
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struct vmw_user_stream *stream;
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struct vmw_resource *res;
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struct vmw_resource *tmp;
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struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
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struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
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struct vmw_master *vmaster = vmw_master(file_priv->master);
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int ret;
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if (unlikely(stream == NULL))
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return -ENOMEM;
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/*
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* Approximate idr memory usage with 128 bytes. It will be limited
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* by maximum number_of streams anyway?
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*/
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if (unlikely(vmw_user_stream_size == 0))
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vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
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ret = ttm_read_lock(&vmaster->lock, true);
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if (unlikely(ret != 0))
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return ret;
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ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
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vmw_user_stream_size,
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false, true);
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if (unlikely(ret != 0)) {
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if (ret != -ERESTARTSYS)
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DRM_ERROR("Out of graphics memory for stream"
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" creation.\n");
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goto out_unlock;
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}
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stream = kmalloc(sizeof(*stream), GFP_KERNEL);
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if (unlikely(stream == NULL)) {
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ttm_mem_global_free(vmw_mem_glob(dev_priv),
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vmw_user_stream_size);
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ret = -ENOMEM;
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goto out_unlock;
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}
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res = &stream->stream.res;
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stream->base.shareable = false;
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stream->base.tfile = NULL;
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/*
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* From here on, the destructor takes over resource freeing.
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*/
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ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
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if (unlikely(ret != 0))
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return ret;
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goto out_unlock;
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tmp = vmw_resource_reference(res);
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ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
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@ -1775,6 +1893,8 @@ int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
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arg->stream_id = res->id;
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out_err:
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vmw_resource_unreference(&res);
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out_unlock:
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ttm_read_unlock(&vmaster->lock);
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return ret;
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}
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