linux-hardening - Re: [PATCH 2/9] drm/amdgpu/discovery: Annotate struct ip_hw_instance with __counted

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Message-ID: <CADnq5_OV7L4_z5mhAq8x8nV4+yp_wGhyVeg1MrKAVoSbMVV1uw@mail.gmail.com>
Date: Fri, 22 Sep 2023 13:42:20 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: David Airlie <airlied@...il.com>, Tejas Upadhyay <tejas.upadhyay@...el.com>, 
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	Karol Herbst <kherbst@...hat.com>, Neil Armstrong <neil.armstrong@...aro.org>, 
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	Lang Yu <Lang.Yu@....com>, Christian König <christian.koenig@....com>, 
	John Harrison <john.c.harrison@...el.com>, Hawking Zhang <Hawking.Zhang@....com>
Subject: Re: [PATCH 2/9] drm/amdgpu/discovery: Annotate struct ip_hw_instance
 with __counted_by

On Fri, Sep 22, 2023 at 1:33 PM Kees Cook <keescook@...omium.org> 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 checking 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 ip_hw_instance.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Alex Deucher <alexander.deucher@....com>
> Cc: "Christian König" <christian.koenig@....com>
> Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Hawking Zhang <Hawking.Zhang@....com>
> Cc: amd-gfx@...ts.freedesktop.org
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Alex Deucher <alexander.deucher@....com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> index d1bc7b212520..be4c97a3d7bf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> @@ -662,7 +662,7 @@ struct ip_hw_instance {
>         u8  harvest;
>
>         int num_base_addresses;
> -       u32 base_addr[];
> +       u32 base_addr[] __counted_by(num_base_addresses);
>  };
>
>  struct ip_hw_id {
> --
> 2.34.1
>