diff mbox series

drm/amdgpu: Annotate struct amdgpu_bo_list with __counted_by

Message ID 20231003232952.work.158-kees@kernel.org
State New
Headers
Series drm/amdgpu: Annotate struct amdgpu_bo_list with __counted_by |

Commit Message

Kees Cook Oct. 3, 2023, 11:29 p.m. UTC 
  Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct amdgpu_bo_list.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Luben Tuikov <luben.tuikov@amd.com>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-hardening@vger.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Comments

Luben Tuikov Oct. 4, 2023, 5:31 p.m. UTC | #1 
On 2023-10-03 19:29, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct amdgpu_bo_list.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
> 
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
> Cc: Luben Tuikov <luben.tuikov@amd.com>
> Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> Cc: amd-gfx@lists.freedesktop.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: linux-hardening@vger.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Christian König Oct. 5, 2023, 2:31 p.m. UTC | #2 
Am 04.10.23 um 01:29 schrieb Kees Cook:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct amdgpu_bo_list.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
> Cc: Luben Tuikov <luben.tuikov@amd.com>
> Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> Cc: amd-gfx@lists.freedesktop.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: linux-hardening@vger.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Christian König <christian.koenig@amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 2 +-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
> index 6f5b641b631e..781e5c5ce04d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
> @@ -84,6 +84,7 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
>   
>   	kref_init(&list->refcount);
>   
> +	list->num_entries = num_entries;
>   	array = list->entries;
>   
>   	for (i = 0; i < num_entries; ++i) {
> @@ -129,7 +130,6 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
>   	}
>   
>   	list->first_userptr = first_userptr;
> -	list->num_entries = num_entries;
>   	sort(array, last_entry, sizeof(struct amdgpu_bo_list_entry),
>   	     amdgpu_bo_list_entry_cmp, NULL);
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> index 6a703be45d04..555cd6d877c3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> @@ -56,7 +56,7 @@ struct amdgpu_bo_list {
>   	 */
>   	struct mutex bo_list_mutex;
>   
> -	struct amdgpu_bo_list_entry entries[];
> +	struct amdgpu_bo_list_entry entries[] __counted_by(num_entries);
>   };
>   
>   int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,
Alex Deucher Oct. 5, 2023, 9:56 p.m. UTC | #3 
Applied.  Thanks!

Alex

On Thu, Oct 5, 2023 at 10:32 AM Christian König
<ckoenig.leichtzumerken@gmail.com> wrote:
>
> Am 04.10.23 um 01:29 schrieb Kees Cook:
> > Prepare for the coming implementation by GCC and Clang of the __counted_by
> > attribute. Flexible array members annotated with __counted_by can have
> > their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> > array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> > functions).
> >
> > As found with Coccinelle[1], add __counted_by for struct amdgpu_bo_list.
> > Additionally, since the element count member must be set before accessing
> > the annotated flexible array member, move its initialization earlier.
> >
> > Cc: Alex Deucher <alexander.deucher@amd.com>
> > Cc: "Christian König" <christian.koenig@amd.com>
> > Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
> > Cc: David Airlie <airlied@gmail.com>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
> > Cc: Luben Tuikov <luben.tuikov@amd.com>
> > Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> > Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> > Cc: amd-gfx@lists.freedesktop.org
> > Cc: dri-devel@lists.freedesktop.org
> > Cc: linux-hardening@vger.kernel.org
> > Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> > Signed-off-by: Kees Cook <keescook@chromium.org>
>
> Reviewed-by: Christian König <christian.koenig@amd.com>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 2 +-
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h | 2 +-
> >   2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
> > index 6f5b641b631e..781e5c5ce04d 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
> > @@ -84,6 +84,7 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
> >
> >       kref_init(&list->refcount);
> >
> > +     list->num_entries = num_entries;
> >       array = list->entries;
> >
> >       for (i = 0; i < num_entries; ++i) {
> > @@ -129,7 +130,6 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
> >       }
> >
> >       list->first_userptr = first_userptr;
> > -     list->num_entries = num_entries;
> >       sort(array, last_entry, sizeof(struct amdgpu_bo_list_entry),
> >            amdgpu_bo_list_entry_cmp, NULL);
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> > index 6a703be45d04..555cd6d877c3 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> > @@ -56,7 +56,7 @@ struct amdgpu_bo_list {
> >        */
> >       struct mutex bo_list_mutex;
> >
> > -     struct amdgpu_bo_list_entry entries[];
> > +     struct amdgpu_bo_list_entry entries[] __counted_by(num_entries);
> >   };
> >
> >   int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
index 6f5b641b631e..781e5c5ce04d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
@@ -84,6 +84,7 @@  int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 
 	kref_init(&list->refcount);
 
+	list->num_entries = num_entries;
 	array = list->entries;
 
 	for (i = 0; i < num_entries; ++i) {
@@ -129,7 +130,6 @@  int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 	}
 
 	list->first_userptr = first_userptr;
-	list->num_entries = num_entries;
 	sort(array, last_entry, sizeof(struct amdgpu_bo_list_entry),
 	     amdgpu_bo_list_entry_cmp, NULL);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
index 6a703be45d04..555cd6d877c3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
@@ -56,7 +56,7 @@  struct amdgpu_bo_list {
 	 */
 	struct mutex bo_list_mutex;
 
-	struct amdgpu_bo_list_entry entries[];
+	struct amdgpu_bo_list_entry entries[] __counted_by(num_entries);
 };
 
 int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,