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[PATCH 3/3] drm/msm: Fix 32b size truncation

Rob Clark posted 3 patches 1 month, 2 weeks ago
There is a newer version of this series
[PATCH 3/3] drm/msm: Fix 32b size truncation
Posted by Rob Clark 1 month, 2 weeks ago 
Somehow we never noticed this when arm64 became a thing, many years ago.

Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/msm_gem.c | 17 ++++++++---------
 drivers/gpu/drm/msm/msm_gem.h |  6 +++---
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 958bac4e2768..9a935650e5e3 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -1142,7 +1142,7 @@ static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct
 
 /* convenience method to construct a GEM buffer object, and userspace handle */
 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
-		uint32_t size, uint32_t flags, uint32_t *handle,
+		size_t size, uint32_t flags, uint32_t *handle,
 		char *name)
 {
 	struct drm_gem_object *obj;
@@ -1208,9 +1208,8 @@ static const struct drm_gem_object_funcs msm_gem_object_funcs = {
 	.vm_ops = &vm_ops,
 };
 
-static int msm_gem_new_impl(struct drm_device *dev,
-		uint32_t size, uint32_t flags,
-		struct drm_gem_object **obj)
+static int msm_gem_new_impl(struct drm_device *dev, uint32_t flags,
+			    struct drm_gem_object **obj)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_gem_object *msm_obj;
@@ -1244,7 +1243,7 @@ static int msm_gem_new_impl(struct drm_device *dev,
 	return 0;
 }
 
-struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32_t flags)
+struct drm_gem_object *msm_gem_new(struct drm_device *dev, size_t size, uint32_t flags)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_gem_object *msm_obj;
@@ -1259,7 +1258,7 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32
 	if (size == 0)
 		return ERR_PTR(-EINVAL);
 
-	ret = msm_gem_new_impl(dev, size, flags, &obj);
+	ret = msm_gem_new_impl(dev, flags, &obj);
 	if (ret)
 		return ERR_PTR(ret);
 
@@ -1299,12 +1298,12 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_gem_object *msm_obj;
 	struct drm_gem_object *obj;
-	uint32_t size;
+	size_t size;
 	int ret, npages;
 
 	size = PAGE_ALIGN(dmabuf->size);
 
-	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
+	ret = msm_gem_new_impl(dev, MSM_BO_WC, &obj);
 	if (ret)
 		return ERR_PTR(ret);
 
@@ -1347,7 +1346,7 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 	return ERR_PTR(ret);
 }
 
-void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size, uint32_t flags,
+void *msm_gem_kernel_new(struct drm_device *dev, size_t size, uint32_t flags,
 			 struct drm_gpuvm *vm, struct drm_gem_object **bo,
 			 uint64_t *iova)
 {
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 751c3b4965bc..a4cf31853c50 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -297,10 +297,10 @@ bool msm_gem_active(struct drm_gem_object *obj);
 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout);
 int msm_gem_cpu_fini(struct drm_gem_object *obj);
 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
-		uint32_t size, uint32_t flags, uint32_t *handle, char *name);
+		size_t size, uint32_t flags, uint32_t *handle, char *name);
 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
-		uint32_t size, uint32_t flags);
-void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size, uint32_t flags,
+		size_t size, uint32_t flags);
+void *msm_gem_kernel_new(struct drm_device *dev, size_t size, uint32_t flags,
 			 struct drm_gpuvm *vm, struct drm_gem_object **bo,
 			 uint64_t *iova);
 void msm_gem_kernel_put(struct drm_gem_object *bo, struct drm_gpuvm *vm);
-- 
2.50.1
Re: [PATCH 3/3] drm/msm: Fix 32b size truncation
Posted by Connor Abbott 1 month, 2 weeks ago 
On Tue, Aug 19, 2025 at 7:29 PM Rob Clark <robin.clark@oss.qualcomm.com> wrote:
>
> Somehow we never noticed this when arm64 became a thing, many years ago.
>
> Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
> ---
>  drivers/gpu/drm/msm/msm_gem.c | 17 ++++++++---------
>  drivers/gpu/drm/msm/msm_gem.h |  6 +++---
>  2 files changed, 11 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index 958bac4e2768..9a935650e5e3 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -1142,7 +1142,7 @@ static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct
>
>  /* convenience method to construct a GEM buffer object, and userspace handle */
>  int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
> -               uint32_t size, uint32_t flags, uint32_t *handle,
> +               size_t size, uint32_t flags, uint32_t *handle,
>                 char *name)
>  {
>         struct drm_gem_object *obj;
> @@ -1208,9 +1208,8 @@ static const struct drm_gem_object_funcs msm_gem_object_funcs = {
>         .vm_ops = &vm_ops,
>  };
>
> -static int msm_gem_new_impl(struct drm_device *dev,
> -               uint32_t size, uint32_t flags,
> -               struct drm_gem_object **obj)
> +static int msm_gem_new_impl(struct drm_device *dev, uint32_t flags,
> +                           struct drm_gem_object **obj)
>  {
>         struct msm_drm_private *priv = dev->dev_private;
>         struct msm_gem_object *msm_obj;
> @@ -1244,7 +1243,7 @@ static int msm_gem_new_impl(struct drm_device *dev,
>         return 0;
>  }
>
> -struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32_t flags)
> +struct drm_gem_object *msm_gem_new(struct drm_device *dev, size_t size, uint32_t flags)
>  {
>         struct msm_drm_private *priv = dev->dev_private;
>         struct msm_gem_object *msm_obj;
> @@ -1259,7 +1258,7 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32
>         if (size == 0)
>                 return ERR_PTR(-EINVAL);
>
> -       ret = msm_gem_new_impl(dev, size, flags, &obj);
> +       ret = msm_gem_new_impl(dev, flags, &obj);
>         if (ret)
>                 return ERR_PTR(ret);
>
> @@ -1299,12 +1298,12 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
>         struct msm_drm_private *priv = dev->dev_private;
>         struct msm_gem_object *msm_obj;
>         struct drm_gem_object *obj;
> -       uint32_t size;
> +       size_t size;
>         int ret, npages;

npages should also be size_t.

>
>         size = PAGE_ALIGN(dmabuf->size);
>
> -       ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
> +       ret = msm_gem_new_impl(dev, MSM_BO_WC, &obj);
>         if (ret)
>                 return ERR_PTR(ret);
>
> @@ -1347,7 +1346,7 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
>         return ERR_PTR(ret);
>  }
>
> -void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size, uint32_t flags,
> +void *msm_gem_kernel_new(struct drm_device *dev, size_t size, uint32_t flags,
>                          struct drm_gpuvm *vm, struct drm_gem_object **bo,
>                          uint64_t *iova)
>  {
> diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
> index 751c3b4965bc..a4cf31853c50 100644
> --- a/drivers/gpu/drm/msm/msm_gem.h
> +++ b/drivers/gpu/drm/msm/msm_gem.h
> @@ -297,10 +297,10 @@ bool msm_gem_active(struct drm_gem_object *obj);
>  int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout);
>  int msm_gem_cpu_fini(struct drm_gem_object *obj);
>  int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
> -               uint32_t size, uint32_t flags, uint32_t *handle, char *name);
> +               size_t size, uint32_t flags, uint32_t *handle, char *name);
>  struct drm_gem_object *msm_gem_new(struct drm_device *dev,
> -               uint32_t size, uint32_t flags);
> -void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size, uint32_t flags,
> +               size_t size, uint32_t flags);
> +void *msm_gem_kernel_new(struct drm_device *dev, size_t size, uint32_t flags,
>                          struct drm_gpuvm *vm, struct drm_gem_object **bo,
>                          uint64_t *iova);
>  void msm_gem_kernel_put(struct drm_gem_object *bo, struct drm_gpuvm *vm);
> --
> 2.50.1
>
Re: [PATCH 3/3] drm/msm: Fix 32b size truncation
Posted by Rob Clark 1 month, 2 weeks ago 
On Wed, Aug 20, 2025 at 6:51 AM Connor Abbott <cwabbott0@gmail.com> wrote:
>
> On Tue, Aug 19, 2025 at 7:29 PM Rob Clark <robin.clark@oss.qualcomm.com> wrote:
> >
> > Somehow we never noticed this when arm64 became a thing, many years ago.
> >
> > Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
> > ---
> >  drivers/gpu/drm/msm/msm_gem.c | 17 ++++++++---------
> >  drivers/gpu/drm/msm/msm_gem.h |  6 +++---
> >  2 files changed, 11 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> > index 958bac4e2768..9a935650e5e3 100644
> > --- a/drivers/gpu/drm/msm/msm_gem.c
> > +++ b/drivers/gpu/drm/msm/msm_gem.c
> > @@ -1142,7 +1142,7 @@ static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct
> >
> >  /* convenience method to construct a GEM buffer object, and userspace handle */
> >  int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
> > -               uint32_t size, uint32_t flags, uint32_t *handle,
> > +               size_t size, uint32_t flags, uint32_t *handle,
> >                 char *name)
> >  {
> >         struct drm_gem_object *obj;
> > @@ -1208,9 +1208,8 @@ static const struct drm_gem_object_funcs msm_gem_object_funcs = {
> >         .vm_ops = &vm_ops,
> >  };
> >
> > -static int msm_gem_new_impl(struct drm_device *dev,
> > -               uint32_t size, uint32_t flags,
> > -               struct drm_gem_object **obj)
> > +static int msm_gem_new_impl(struct drm_device *dev, uint32_t flags,
> > +                           struct drm_gem_object **obj)
> >  {
> >         struct msm_drm_private *priv = dev->dev_private;
> >         struct msm_gem_object *msm_obj;
> > @@ -1244,7 +1243,7 @@ static int msm_gem_new_impl(struct drm_device *dev,
> >         return 0;
> >  }
> >
> > -struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32_t flags)
> > +struct drm_gem_object *msm_gem_new(struct drm_device *dev, size_t size, uint32_t flags)
> >  {
> >         struct msm_drm_private *priv = dev->dev_private;
> >         struct msm_gem_object *msm_obj;
> > @@ -1259,7 +1258,7 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32
> >         if (size == 0)
> >                 return ERR_PTR(-EINVAL);
> >
> > -       ret = msm_gem_new_impl(dev, size, flags, &obj);
> > +       ret = msm_gem_new_impl(dev, flags, &obj);
> >         if (ret)
> >                 return ERR_PTR(ret);
> >
> > @@ -1299,12 +1298,12 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
> >         struct msm_drm_private *priv = dev->dev_private;
> >         struct msm_gem_object *msm_obj;
> >         struct drm_gem_object *obj;
> > -       uint32_t size;
> > +       size_t size;
> >         int ret, npages;
>
> npages should also be size_t.

hmm, true.. a bit more of a theoretical overflow on existing devices,
but v2 will fix that

> >
> >         size = PAGE_ALIGN(dmabuf->size);
> >
> > -       ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
> > +       ret = msm_gem_new_impl(dev, MSM_BO_WC, &obj);
> >         if (ret)
> >                 return ERR_PTR(ret);
> >
> > @@ -1347,7 +1346,7 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
> >         return ERR_PTR(ret);
> >  }
> >
> > -void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size, uint32_t flags,
> > +void *msm_gem_kernel_new(struct drm_device *dev, size_t size, uint32_t flags,
> >                          struct drm_gpuvm *vm, struct drm_gem_object **bo,
> >                          uint64_t *iova)
> >  {
> > diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
> > index 751c3b4965bc..a4cf31853c50 100644
> > --- a/drivers/gpu/drm/msm/msm_gem.h
> > +++ b/drivers/gpu/drm/msm/msm_gem.h
> > @@ -297,10 +297,10 @@ bool msm_gem_active(struct drm_gem_object *obj);
> >  int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout);
> >  int msm_gem_cpu_fini(struct drm_gem_object *obj);
> >  int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
> > -               uint32_t size, uint32_t flags, uint32_t *handle, char *name);
> > +               size_t size, uint32_t flags, uint32_t *handle, char *name);
> >  struct drm_gem_object *msm_gem_new(struct drm_device *dev,
> > -               uint32_t size, uint32_t flags);
> > -void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size, uint32_t flags,
> > +               size_t size, uint32_t flags);
> > +void *msm_gem_kernel_new(struct drm_device *dev, size_t size, uint32_t flags,
> >                          struct drm_gpuvm *vm, struct drm_gem_object **bo,
> >                          uint64_t *iova);
> >  void msm_gem_kernel_put(struct drm_gem_object *bo, struct drm_gpuvm *vm);
> > --
> > 2.50.1
> >

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