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>

1 files changed, 146 insertions, 26 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 93a68a61419..c7cff3debe1 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -39,6 +39,7 @@ struct vmw_user_context {
 struct vmw_user_surface {
         struct ttm_base_object base;
         struct vmw_surface srf;
+        uint32_t size;
 };
 
 struct vmw_user_dma_buffer {
@@ -67,6 +68,11 @@ struct vmw_surface_offset {
         uint32_t bo_offset;
 };
 
+
+static uint64_t vmw_user_context_size;
+static uint64_t vmw_user_surface_size;
+static uint64_t vmw_user_stream_size;
+
 static inline struct vmw_dma_buffer *
 vmw_dma_buffer(struct ttm_buffer_object *bo)
 {
@@ -343,8 +349,11 @@ static void vmw_user_context_free(struct vmw_resource *res)
 {
         struct vmw_user_context *ctx =
             container_of(res, struct vmw_user_context, res);
+        struct vmw_private *dev_priv = res->dev_priv;
 
         kfree(ctx);
+        ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                            vmw_user_context_size);
 }
 
 /**
@@ -398,23 +407,56 @@ int vmw_context_define_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv)
 {
         struct vmw_private *dev_priv = vmw_priv(dev);
-        struct vmw_user_context *ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+        struct vmw_user_context *ctx;
         struct vmw_resource *res;
         struct vmw_resource *tmp;
         struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
+        struct vmw_master *vmaster = vmw_master(file_priv->master);
         int ret;
 
-        if (unlikely(ctx == NULL))
-                return -ENOMEM;
+
+        /*
+         * Approximate idr memory usage with 128 bytes. It will be limited
+         * by maximum number_of contexts anyway.
+         */
+
+        if (unlikely(vmw_user_context_size == 0))
+                vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 128;
+
+        ret = ttm_read_lock(&vmaster->lock, true);
+        if (unlikely(ret != 0))
+                return ret;
+
+        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
+                                   vmw_user_context_size,
+                                   false, true);
+        if (unlikely(ret != 0)) {
+                if (ret != -ERESTARTSYS)
+                        DRM_ERROR("Out of graphics memory for context"
+                                  " creation.\n");
+                goto out_unlock;
+        }
+
+        ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+        if (unlikely(ctx == NULL)) {
+                ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                                    vmw_user_context_size);
+                ret = -ENOMEM;
+                goto out_unlock;
+        }
 
         res = &ctx->res;
         ctx->base.shareable = false;
         ctx->base.tfile = NULL;
 
+        /*
+         * From here on, the destructor takes over resource freeing.
+         */
+
         ret = vmw_context_init(dev_priv, res, vmw_user_context_free);
         if (unlikely(ret != 0))
-                return ret;
+                goto out_unlock;
 
         tmp = vmw_resource_reference(&ctx->res);
         ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
@@ -428,6 +470,8 @@ int vmw_context_define_ioctl(struct drm_device *dev, void *data,
         arg->cid = res->id;
 out_err:
         vmw_resource_unreference(&res);
+out_unlock:
+        ttm_read_unlock(&vmaster->lock);
         return ret;
 
 }
@@ -1095,6 +1139,8 @@ static void vmw_user_surface_free(struct vmw_resource *res)
         struct vmw_surface *srf = container_of(res, struct vmw_surface, res);
         struct vmw_user_surface *user_srf =
             container_of(srf, struct vmw_user_surface, srf);
+        struct vmw_private *dev_priv = srf->res.dev_priv;
+        uint32_t size = user_srf->size;
 
         if (srf->backup)
                 ttm_bo_unref(&srf->backup);
@@ -1102,6 +1148,7 @@ static void vmw_user_surface_free(struct vmw_resource *res)
         kfree(srf->sizes);
         kfree(srf->snooper.image);
         kfree(user_srf);
+        ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
 }
 
 /**
@@ -1226,9 +1273,45 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
         struct vmw_surface_offset *cur_offset;
         uint32_t stride_bpp;
         uint32_t bpp;
+        uint32_t num_sizes;
+        uint32_t size;
+        struct vmw_master *vmaster = vmw_master(file_priv->master);
 
-        if (unlikely(user_srf == NULL))
-                return -ENOMEM;
+        if (unlikely(vmw_user_surface_size == 0))
+                vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
+                        128;
+
+        num_sizes = 0;
+        for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
+                num_sizes += req->mip_levels[i];
+
+        if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
+            DRM_VMW_MAX_MIP_LEVELS)
+                return -EINVAL;
+
+        size = vmw_user_surface_size + 128 +
+                ttm_round_pot(num_sizes * sizeof(struct drm_vmw_size)) +
+                ttm_round_pot(num_sizes * sizeof(struct vmw_surface_offset));
+
+
+        ret = ttm_read_lock(&vmaster->lock, true);
+        if (unlikely(ret != 0))
+                return ret;
+
+        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
+                                   size, false, true);
+        if (unlikely(ret != 0)) {
+                if (ret != -ERESTARTSYS)
+                        DRM_ERROR("Out of graphics memory for surface"
+                                  " creation.\n");
+                goto out_unlock;
+        }
+
+        user_srf = kmalloc(sizeof(*user_srf), GFP_KERNEL);
+        if (unlikely(user_srf == NULL)) {
+                ret = -ENOMEM;
+                goto out_no_user_srf;
+        }
 
         srf = &user_srf->srf;
         res = &srf->res;
@@ -1239,20 +1322,13 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
         srf->backup = NULL;
 
         memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
-        srf->num_sizes = 0;
-        for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
-                srf->num_sizes += srf->mip_levels[i];
-
-        if (srf->num_sizes > DRM_VMW_MAX_SURFACE_FACES *
-            DRM_VMW_MAX_MIP_LEVELS) {
-                ret = -EINVAL;
-                goto out_err0;
-        }
+        srf->num_sizes = num_sizes;
+        user_srf->size = size;
 
         srf->sizes = kmalloc(srf->num_sizes * sizeof(*srf->sizes), GFP_KERNEL);
         if (unlikely(srf->sizes == NULL)) {
                 ret = -ENOMEM;
-                goto out_err0;
+                goto out_no_sizes;
         }
         srf->offsets = kmalloc(srf->num_sizes * sizeof(*srf->offsets),
                                GFP_KERNEL);
@@ -1268,7 +1344,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
                              srf->num_sizes * sizeof(*srf->sizes));
         if (unlikely(ret != 0)) {
                 ret = -EFAULT;
-                goto out_err1;
+                goto out_no_copy;
         }
 
         cur_bo_offset = 0;
@@ -1305,7 +1381,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
                 if (!srf->snooper.image) {
                         DRM_ERROR("Failed to allocate cursor_image\n");
                         ret = -ENOMEM;
-                        goto out_err1;
+                        goto out_no_copy;
                 }
         } else {
                 srf->snooper.image = NULL;
@@ -1322,7 +1398,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 
         ret = vmw_surface_init(dev_priv, srf, vmw_user_surface_free);
         if (unlikely(ret != 0))
-                return ret;
+                goto out_unlock;
 
         tmp = vmw_resource_reference(&srf->res);
         ret = ttm_base_object_init(tfile, &user_srf->base,
@@ -1332,7 +1408,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
         if (unlikely(ret != 0)) {
                 vmw_resource_unreference(&tmp);
                 vmw_resource_unreference(&res);
-                return ret;
+                goto out_unlock;
         }
 
         rep->sid = user_srf->base.hash.key;
@@ -1340,13 +1416,19 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
                 DRM_ERROR("Created bad Surface ID.\n");
 
         vmw_resource_unreference(&res);
+
+        ttm_read_unlock(&vmaster->lock);
         return 0;
-out_err1:
+out_no_copy:
         kfree(srf->offsets);
 out_no_offsets:
         kfree(srf->sizes);
-out_err0:
+out_no_sizes:
         kfree(user_srf);
+out_no_user_srf:
+        ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
+out_unlock:
+        ttm_read_unlock(&vmaster->lock);
         return ret;
 }
 
@@ -1690,8 +1772,11 @@ static void vmw_user_stream_free(struct vmw_resource *res)
 {
         struct vmw_user_stream *stream =
             container_of(res, struct vmw_user_stream, stream.res);
+        struct vmw_private *dev_priv = res->dev_priv;
 
         kfree(stream);
+        ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                            vmw_user_stream_size);
 }
 
 /**
@@ -1745,23 +1830,56 @@ int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
                            struct drm_file *file_priv)
 {
         struct vmw_private *dev_priv = vmw_priv(dev);
-        struct vmw_user_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
+        struct vmw_user_stream *stream;
         struct vmw_resource *res;
         struct vmw_resource *tmp;
         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
+        struct vmw_master *vmaster = vmw_master(file_priv->master);
         int ret;
 
-        if (unlikely(stream == NULL))
-                return -ENOMEM;
+        /*
+         * Approximate idr memory usage with 128 bytes. It will be limited
+         * by maximum number_of streams anyway?
+         */
+
+        if (unlikely(vmw_user_stream_size == 0))
+                vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
+
+        ret = ttm_read_lock(&vmaster->lock, true);
+        if (unlikely(ret != 0))
+                return ret;
+
+        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
+                                   vmw_user_stream_size,
+                                   false, true);
+        if (unlikely(ret != 0)) {
+                if (ret != -ERESTARTSYS)
+                        DRM_ERROR("Out of graphics memory for stream"
+                                  " creation.\n");
+                goto out_unlock;
+        }
+
+
+        stream = kmalloc(sizeof(*stream), GFP_KERNEL);
+        if (unlikely(stream == NULL)) {
+                ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                                    vmw_user_stream_size);
+                ret = -ENOMEM;
+                goto out_unlock;
+        }
 
         res = &stream->stream.res;
         stream->base.shareable = false;
         stream->base.tfile = NULL;
 
+        /*
+         * From here on, the destructor takes over resource freeing.
+         */
+
         ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
         if (unlikely(ret != 0))
-                return ret;
+                goto out_unlock;
 
         tmp = vmw_resource_reference(res);
         ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
@@ -1775,6 +1893,8 @@ int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
         arg->stream_id = res->id;
 out_err:
         vmw_resource_unreference(&res);
+out_unlock:
+        ttm_read_unlock(&vmaster->lock);
         return ret;
 }